JP2001315240A - Electromagnetic wave shielding light pervious laminated film and display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic wave shielding light pervious laminated film lightweight and thin, having good electromagnetic shielding capacity and near infrared ray cutting capacity, capable of obtaining a light pervious sharp image, capable of being easily earthed to PDP, and a capable of imparting good electromagnetic shielding capacity, near infrared cutting capacity and light perviouseness only by bonding this laminated film to the front panel of PDP, and a display panel using the electromagnetic wave shielding light pervious laminated film. SOLUTION: The electromagnetic wave shielding light pervious laminated film 1 is obtained by integrating a reflection preventing film 2, a conductive mesh 3 and a near infrared cutting film 4 through adhesive intermediate films 5A, 5B. The protruding edge 3A of the conductive mesh 3 is folded back to be fastened to the reflection preventing film 2 by a conductive pressure-sensitive tape 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave shielding light-transmitting laminated film, and more particularly to a light-transmitting and light-transmitting laminated film having good electromagnetic wave shielding and near-infrared cut properties.
The present invention relates to an electromagnetic wave shielding light transmitting laminated film useful as a front filter or the like of P (plasma display panel). The present invention also relates to a display panel such as a PDP to which the electromagnetic wave shielding light transmitting laminated film is adhered.

[0002]

2. Description of the Related Art In recent years, with the spread of office automation equipment and communication equipment, electromagnetic waves generated from these equipment have become a problem. That is, there is a concern that the electromagnetic waves may affect the human body, and malfunctions of precision equipment due to the electromagnetic waves have become a problem.

Therefore, as a front filter of a PDP of an OA device, a window material having an electromagnetic wave shielding property and a light transmitting property has been conventionally developed and put to practical use. Such a window material is also used as a window material in a place where precision equipment is installed, such as a hospital or a laboratory, in order to protect precision equipment from electromagnetic waves such as mobile phones.

The conventional electromagnetic wave shielding light transmitting window material has a structure in which a conductive mesh material such as a wire mesh is interposed between transparent substrates such as an acrylic plate.

The present applicant has proposed a method of improving the characteristics and workability of such a conventional electromagnetic shielding light transmitting window material by interposing a conductive mesh between two transparent substrates to form a transparent adhesive resin. (Japanese Unexamined Patent Publication No. 11-74683).

[0006] With this electromagnetic wave shielding light transmitting window material, a clear image can be obtained with good electromagnetic wave shielding and light transmissivity. Of the transparent substrate is also prevented.

Further, in the above-mentioned conventional electromagnetic wave shielding light transmitting window material, in order to improve the electromagnetic wave shielding property,
It is necessary to ground an electromagnetic wave shielding material, for example, a conductive mesh, to the PDP body. For this purpose, the electromagnetic wave shielding material is protruded outside from between the two transparent substrates and is routed to the back side of the light transmitting window material laminate to be grounded, or is brought into contact with the electromagnetic wave shielding material between the two transparent substrates. It is necessary to sandwich the conductive adhesive tape so as to perform the operation. Usually, a glass of 2 to 3 mm is used for the transparent substrate, and these glasses are heavy in a filter for a large screen, so that the above operation in the laminating step is not only difficult but also it is difficult to reliably perform the laminating operation.

[0008]

Since the electromagnetic wave shielding light transmitting window material using two transparent substrates has a large thickness and a large weight, a reduction in thickness and weight is desired.

[0009] Further, in such an electromagnetic wave shielding light transmitting window material, near-infrared ray cut performance is an important required characteristic for the purpose of preventing malfunction of a remote controller and the like. In particular, recently, the amount of near-infrared rays generated has increased along with the improvement in the brightness of PDPs, so that a higher-level near-infrared ray cutoff performance is required.

Accordingly, the present invention is light and thin, has good electromagnetic wave shielding performance and near-infrared cut performance, and can obtain a clear image with light transmission.
Electromagnetic wave shielding and light-transmitting laminate that can easily provide grounding to P and provide these electromagnetic wave shielding performance, near-infrared cut-off performance, and good light transmission only by sticking to the front panel of PDP It is an object of the present invention to provide a film and a display panel using such an electromagnetic wave shielding light transmitting laminated film.

[0011]

The electromagnetic wave shielding light transmitting laminated film of the present invention (claim 1) is obtained by integrally laminating an electromagnetic wave shielding material, an outermost antireflection film, and a near infrared cut film. An electromagnetic wave shielding light transmitting laminated film provided with an adhesive layer as the backmost layer, wherein an edge of the electromagnetic wave shielding material is protruded from an edge of the antireflection film to form an edge of the antireflection film. The electromagnetic wave shield material is folded back to the surface side of the antireflection film along the surface thereof, and the folded portion of the electromagnetic wave shielding material is fixed to the surface of the antireflection film with a conductive adhesive tape.

In the electromagnetic wave shielding light transmitting laminated film, a mesh of a metal fiber and / or a metal-coated organic fiber or a transparent conductive film can be suitably used as the electromagnetic wave shielding material.

[0013] The electromagnetic wave shielding light transmitting laminated film of the present invention (Claim 3) is obtained by laminating and integrating an electromagnetic wave shielding material and an antireflection / near-infrared cut film on the outermost layer, and a pressure-sensitive adhesive layer as the backmost layer Wherein the edge of the electromagnetic wave shielding material protrudes from the edge of the anti-reflection / near-infrared cut film to form an edge of the anti-reflection / near-infrared cut film. Along with the anti-reflection / near-infrared cut film, and the folded portion of the electromagnetic wave shielding material is fixed to the surface of the anti-reflection / near-infrared cut film with a conductive adhesive tape.

In the electromagnetic wave shielding light transmitting laminated film, a transparent conductive film can be suitably used as the electromagnetic wave shielding material.

This electromagnetic wave shielding light transmitting laminated film is lightweight and thin because it is mainly composed of an electromagnetic wave shielding material, an antireflection film and a near-infrared cut film or an anti-reflection / near-infrared cut film. And since it has a pressure-sensitive adhesive layer on the bottom layer, the pressure-sensitive adhesive layer
It can be easily adhered to the front panel of P, etc., and a clear image can be obtained based on good electromagnetic wave shielding performance, near-infrared cut-off performance, and light transmittance only by attaching.

Further, the electromagnetic wave shielding material is folded back to the surface of the outermost layer, and the folded portion is fixed to the surface of the outermost layer with a conductive adhesive tape. The conductive adhesive tape is used as an electrode for grounding, and the electromagnetic shielding material can be easily and reliably grounded to the PDP.

Specifically, in the electromagnetic wave shielding light transmitting laminated film of the present invention, it is preferable that each film and the electromagnetic wave shielding material are joined and integrated with a transparent adhesive.

By including an ultraviolet absorber in this transparent adhesive, the electromagnetic wave shielding light-transmitting laminated film has a further excellent ultraviolet cut property.

The display panel of the present invention is obtained by sticking such an electromagnetic wave shielding light transmitting laminated film of the present invention on the front surface of the display panel.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the electromagnetic wave shielding light transmitting laminated film and the display panel of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 3 are schematic sectional views showing the electromagnetic wave shielding light transmitting laminated films 1, 1A and 1B according to the embodiment of the present invention, and FIGS. 4 (a) to 4 (d) show near infrared cut layers. FIG. FIG. 5 is a view showing a front panel of a PDP to which the electromagnetic wave shielding light transmitting laminated film of the present invention is adhered, FIG. 5 (a) is a plan view, and FIG.
FIG. 5B is a cross-sectional view taken along the line BB of FIG.

The electromagnetic-shielding light-transmitting laminated film 1 of FIG. 1 is laminated using an intermediate film 5A, 5B for bonding, in which an anti-reflection film 2, a conductive mesh 3, and a near-infrared cut film 4 as an outermost layer serve as an adhesive. An adhesive layer 6 is provided on the outer surface of the near-infrared cut film 4 as an innermost layer.

The edge 3A of the conductive mesh 3 protrudes from the laminated surface of the anti-reflection film 2 and the near-infrared cut film 4, and extends along the edge of the anti-reflection film 2 on the front side of the anti-reflection film 2. The folded portion 3B is fastened to the surface of the antireflection film 2 with a conductive adhesive tape 7.

The protruding edge portion 3A and the folded portion 3B may be provided on the entire periphery of the conductive mesh 3.
It may be provided only on the side or only two opposing sides.

The electromagnetic wave shielding light transmitting laminated film 1A shown in FIG. 2 is formed by using the intermediate films 5A and 5B for bonding, in which the outermost antireflection film 2, the near infrared cut film 4 and the transparent conductive film 8 serve as an adhesive. The pressure-sensitive adhesive layer 6 is provided on the outer surface of the transparent conductive film 8 as a rearmost layer.

The edge 8A of the transparent conductive film 8 protrudes from the laminated surface of the antireflection film 2 and the near-infrared cut film 4, and extends along the edge of the antireflection film 2 on the front side of the antireflection film 2. The folded portion 8B is fastened to the surface of the antireflection film 2 with the conductive adhesive tape 7.

The protruding edge portion 8A and the folded portion 8B may be provided on the entire periphery of the transparent conductive film 8, or may be provided on only one side or only two opposing sides.

The electromagnetic-shielding light-transmitting laminated film 1B shown in FIG. 3 is integrated by laminating an antireflection / near-infrared cut film 9 on the outermost layer and a transparent conductive film 8 using an adhesive intermediate film 5A serving as an adhesive. An adhesive layer 6 is provided on the outer surface of the transparent conductive film 8 as a rearmost layer.

Also in this electromagnetic wave shielding light transmitting laminated film 1B, the edge 8A of the transparent conductive film 8 protrudes from the edge of the anti-reflection / near infrared cut film 9 to form the anti-reflection / near infrared cut film 9. The antireflection / near-infrared cut film 9 is folded along the edge to the front side of the antireflection / near-infrared cut film 9, and the folded portion 8 </ b> B is fixed to the surface of the antireflection / near-infrared cut film 9 with a conductive adhesive tape 7. The protruding edge portion 8A and the folded portion 8B
May be provided on the entire periphery of the transparent conductive film 8 or may be provided only on one side or only two opposing sides.

Regardless of the electromagnetic wave shielding light transmitting laminated film 1, 1A, 1B, the conductive mesh 3 or the conductive adhesive tape 7 for fastening the folded portions 3B, 8B of the transparent conductive film 8 can be reliably used. In addition, good conduction can be achieved, and extremely excellent electromagnetic wave shielding performance can be obtained. Further, since the antireflection film 2 and the near-infrared cut film 4 or the anti-reflection / near-infrared cut film 9 are provided, the antireflection performance and the near-infrared cut performance are excellent.

In the present invention, as the antireflection film 2, a monolayer film of the following (1) or a high refractive index transparent film is formed on a base film (thickness is, for example, about 25 to 250 μm) of PET, PC, PMMA or the like. And a low-refractive-index transparent film,
For example, there may be mentioned those in which a laminated film having a laminated structure as shown in (2) to (5) below is formed. (1) One layer of a transparent film having a lower refractive index than the constituent material of the panel to which the electromagnetic wave shielding light transmitting laminated film is adhered. (2) One high refractive index transparent film and one low refractive index transparent film are added. (3) Two high-refractive-index transparent films and two low-refractive-index transparent films are alternately laminated, each of which is a total of four layers (4) Medium-refractive-index transparent film / High-refractive-index transparent film / Low-refractive index One layer in the order of the transparent film and three layers in total (5) High refractive index transparent film / Low refractive index transparent film in the order of three layers alternately laminated in a total of six layers High refractive index As the transparent film, ITO (tin indium oxide), ZnO, Al-doped ZnO, TiO ₂ ,
A thin film having a refractive index of 1.6 or more, such as SnO ₂ or ZrO, preferably a transparent conductive thin film can be formed. The high refractive index transparent film may be a thin film in which these fine particles are dispersed in an acrylic or polyester binder. Further, as the low-refractive-index transparent film, a thin film made of a low-refractive-index material such as SiO ₂ , MgF ₂ , or Al ₂ O _{3 having} a refractive index of 1.6 or less can be formed. As the low refractive index transparent film, a thin film made of a silicon-based or fluorine-based organic material is also suitable. These film thicknesses differ depending on the film configuration, film type, and center wavelength in order to reduce the reflectance in the visible light region due to light interference.
In the case of a layer structure, the first layer (high-refractive-index transparent film) on the panel sticking side has a thickness of 5 to 50 nm, and the second layer (low-refractive-index transparent film) has a thickness of 5 to 50 nm.
50 nm, third layer (high refractive index transparent film) 50 to 100 n
m, a fourth layer (low-refractive-index transparent film) is formed with a thickness of about 50 to 150 nm.

Further, an anti-contamination film may be further formed on the anti-reflection film 2 so as to enhance the surface's anti-staining property. In this case, as the contamination prevention film, a film thickness of 1 to 100 made of a fluorine-based thin film, a silicon-based thin film, or the like
A thin film of about nm is preferred.

In the electromagnetic wave shielding light transmitting laminated film of the present invention, the near-infrared cut film 4 comprises a base film and two or more near-infrared cut layers as near-infrared cut layers, preferably two or more near-infrared cut materials. The combination of the above layer and the above layer is preferable in that extremely good near-infrared absorption performance can be obtained in a wide near-infrared wavelength region.

In the present invention, this near-infrared cut layer can have the following structure. A first near-infrared cut film in which a base film is provided with a coating layer of a first near-infrared cut material,
Combination with a second near-infrared cut film in which a base film is provided with a coating layer of a second near-infrared cut material different from the first near-infrared cut material, a first near-infrared cut on one surface of the base film A near-infrared cut film in which a coating layer of a material is provided and a coating layer of a second near-infrared cut material different from the first near-infrared cut material is provided on the other surface. A near-infrared cut film provided by laminating a coating layer of a second near-infrared cut material different from the first near-infrared cut material as the near-infrared cut material. , Phthalocyanine, zinc oxide, silver, ITO (indium tin oxide) and other transparent conductive materials, nickel complex, Can be used in which a coating layer of the near infrared cutting material immonium-based, or the like. The base film is preferably made of PET, PC, PMM
A film made of A or the like can be used. This film is preferably about 10 μm to 1 mm in order to ensure handleability and durability without excessively increasing the thickness of the obtained electromagnetic wave shielding light transmitting laminated film. The thickness of the near-infrared cut coating layer formed on the base film is usually 0.5 to
It is about 50 μm.

In the present invention, a near-infrared cut layer using preferably two or more kinds of the above-mentioned near-infrared cut materials may be provided, and two or more kinds of coating layers may be mixed or laminated. The base film may be coated on both sides separately, or two or more near-infrared cut films may be laminated.

As the near-infrared cut film 4, for example, those shown in FIGS. 4A to 4D can be used. 4 (a) to 4 (d), the one shown in FIG. 4 (c) or (d) is preferable because there is only one film and the coating layer is not exposed on the outer surface.

The near-infrared cut layer film shown in FIG. 4A is a near-infrared cut film 4A in which a coating layer of a near-infrared cut material 11 is formed on a base film 10.
And a film 4B in which a coating layer of a near infrared cut material 12 different from the near infrared cut material 11 is formed on the base film 10.

The near-infrared cut layer film 4 shown in FIG.
C has a coating layer of a near-infrared cut material 11 formed on one surface of the base film 10 and a coating layer of a near-infrared cut material 12 different from the near infrared cut material 11 on the other surface.

The near-infrared cut layer film 4D shown in FIG. 4C is obtained by laminating a coating layer of a near-infrared cut material 11 and a near infrared cut 12 on one surface of a base film 10. .

It should be noted that three or more kinds of near-infrared cut materials may be used, or a plurality of near-infrared cut films shown in FIGS. 4A to 4C may be used in combination.

The near-infrared cut layer film 4E shown in FIG. 4D is obtained by forming a coating layer of the near-infrared cut material 13 on one surface of the base film 10, and preferably comprises two or more kinds of near-infrared cut materials. Are mixed to form a coating layer.

In particular, in the present invention, a combination of two or more kinds of near-infrared cut materials having different near-infrared cut types as described below is used as the near-infrared cut material, without impairing the transparency. It is preferable to obtain infrared cut performance (for example, a performance of sufficiently absorbing near infrared rays in a wide wavelength range of near infrared rays such as 850 to 1250 nm). (A) ITO coating layer having a thickness of 100 to 5000 （(b) Coating layer formed by alternating lamination of ITO and silver having a thickness of 100 to 10000 （(c) Nickel complex system and immonium system having a thickness of 0.5 to 50 μm (D) Coating layer formed by using a suitable transparent binder with a copper compound containing divalent copper ions having a thickness of 10 to 10000 microns (e). An organic dye-based coating layer having a thickness of 0.5 to 50 microns is suitable, but not limited thereto.

In the present invention, for example, a transparent conductive film described later may be further laminated together with a near-infrared cut film.

The conductive mesh 3 used in the electromagnetic wave shielding light transmitting laminated film 1 of FIG. 1 is made of a metal fiber and / or a metal-coated organic fiber.
In the present invention, in order to improve the light transmittance and prevent the moire phenomenon, for example, the wire diameter is 1 μm to 1 mm, and the aperture ratio is 40 to 95.
% Is preferred. In this conductive mesh, if the wire diameter exceeds 1 mm, the aperture ratio is reduced or the electromagnetic wave shielding property is reduced, so that the compatibility cannot be achieved. If it is less than 1 μm, the strength as a mesh decreases, and handling becomes extremely difficult. On the other hand, if the aperture ratio exceeds 95%, it is difficult to maintain the shape as a mesh, and if it is less than 40%, the light transmittance is low, and the amount of light from the display is reduced. A more preferable wire diameter is 10 to 500 μm, and an opening ratio is 50 to 90%.

The aperture ratio of the conductive mesh means the ratio of the area occupied by the openings in the projected area of the conductive mesh.

Metals constituting the conductive mesh 3 and metals of the metal-coated organic fibers include copper, stainless steel, aluminum, nickel, titanium, tungsten, tin, and the like.
Lead, iron, silver, chromium, carbon or alloys thereof, preferably copper, nickel, stainless steel or aluminum are used.

As the organic material of the metal-coated organic fiber, polyester, nylon, vinylidene chloride, aramid, vinylon, cellulose and the like are used.

In the present invention, in order to maintain the above-mentioned aperture ratio and wire diameter, it is preferable to use a conductive mesh made of a metal-coated organic fiber having excellent mesh shape maintaining characteristics.

As the electromagnetic wave shielding material, an etching mesh or a conductive printing mesh can be used instead of the above-mentioned conductive mesh.

As the etching mesh, a metal film obtained by etching a metal film into an arbitrary shape such as a lattice shape or a punching metal shape by a photolithography technique can be used. As the metal film, PET, PC, P
On a transparent substrate such as MMA, copper, aluminum, stainless steel,
A metal film of chromium or the like formed by vapor deposition or sputtering, or a film in which these metal foils are bonded to a transparent substrate with an adhesive can be used. As the adhesive, an epoxy-based, urethane-based, EVA-based adhesive, or the like is preferable.

It is preferable that these metal films are previously black-printed on one or both surfaces. By using the photolithography technique, the shape and the wire diameter of the conductive portion can be freely designed, so that the aperture ratio can be made higher than that of the conductive mesh.

As the conductive printing mesh, metal particles such as silver, copper, aluminum, nickel or the like or non-metallic conductive particles such as carbon can be used as binders such as epoxy-based, urethane-based, EVA-based, melanin-based, cellulose-based and acrylic-based binders. Can be used by gravure printing, offset printing, screen printing, or the like, and printed on a transparent substrate such as PET, PC, PMMA, or the like in a lattice-like pattern.

As the transparent conductive film 8 used for the electromagnetic wave shielding light transmitting laminated films 1A and 1B shown in FIGS. 2 and 3, a transparent conductive layer is formed on a resin film in which conductive particles are dispersed or on a base film. Can be used.

The conductive particles to be dispersed in the film are not particularly limited as long as they have conductivity, and examples thereof include the following. (i) Carbon particles or powder (ii) Nickel, indium, chromium, gold, vanadium, tin, cadmium, silver, platinum, aluminum, copper, titanium, cobalt, lead and other metals or alloys or conductive oxides thereof Particles or powder (iii) Plastic particles such as polystyrene, polyethylene, etc. on the surface of which a coating layer of the conductive material of (i) or (ii) is formed (iv) Alternating laminate of ITO and silver These conductive particles Since the particle size of the excessively large affects the light transmission and the thickness of the transparent conductive film,
It is preferably 0.5 mm or less. The preferred particle size of the conductive particles is 0.01 to 0.5 mm.

When the mixing ratio of the conductive particles in the transparent conductive film is too large, the light transmittance is impaired, and when the mixing ratio is too small, the electromagnetic wave shielding property is insufficient. The proportion is preferably about 0.1 to 50% by weight, particularly about 0.1 to 20% by weight, especially about 0.5 to 20% by weight.

The color and gloss of the conductive particles are appropriately selected according to the purpose. However, for use as a filter for a display panel, a dark and matte color such as black or brown is preferred. In this case, by adjusting the light transmittance of the filter appropriately by the conductive particles, there is also an effect that the screen becomes easy to see.

Examples of the base film having a transparent conductive layer formed thereon include a transparent conductive layer formed of tin indium oxide, zinc aluminum oxide, or the like formed by vapor deposition, sputtering, ion plating, CVD, or the like. . In this case, if the thickness of the transparent conductive layer is less than 0.01 μm, the thickness of the conductive layer for shielding electromagnetic waves is too thin,
Sufficient electromagnetic wave shielding properties cannot be obtained, and if it exceeds 5 μm, light transmittance may be impaired.

As the matrix resin of the transparent conductive film or the resin of the base film, polyester, PET, polybutylene terephthalate, PMMA,
Acrylic plate, PC, polystyrene, triacetate film, polyvinyl alcohol, polyvinyl chloride, polyvinylidene chloride, polyethylene, ethylene-vinyl acetate copolymer, polyvinyl butyral, metal ion crosslinked ethylene-methacrylic acid copolymer, polyurethane, cellophane, etc. Preferably, PET, PC and PMMA are mentioned.

The thickness of such a transparent conductive film is
Usually, it is about 1 μm to 5 mm.

As the anti-reflection / near-infrared cut film 9 used in the electromagnetic wave shielding light transmitting laminated film 1B of FIG. 3, the above-mentioned near-infrared cut layer is formed on the above-mentioned base film, and further on this base film. The anti-reflection layer described above is laminated.

Adhesive intermediate film 5 for adhering each film etc.
As the adhesive resin constituting A and 5B, a transparent and elastic resin, for example, a resin usually used as an adhesive for laminated glass is preferable.

Specific examples of the resin of the film having such elasticity include ethylene-vinyl acetate copolymer, ethylene-methyl acrylate copolymer, ethylene- (meth)
Acrylic acid copolymer, ethylene-ethyl (meth) acrylate copolymer, ethylene-methyl (meth) acrylate copolymer, metal ion crosslinked ethylene- (meth) acrylic acid copolymer, partially saponified ethylene-vinyl acetate Copolymer, carboxylethylene-vinyl acetate copolymer, ethylene-
Ethylene-based copolymers such as (meth) acryl-maleic anhydride copolymer and ethylene-vinyl acetate- (meth) acrylate copolymer may be mentioned ("(meth) acryl" means "acryl or methacryl"). Shown). In addition, polyvinyl butyral (PVB) resin, epoxy resin, acrylic resin, phenol resin, silicone resin, polyester resin, urethane resin, etc. can also be used, but the most balanced in terms of performance and the easy-to-use one is ethylene-vinyl acetate It is a copolymer (EVA). Further, PVB resins used in laminated glass for automobiles are also suitable in terms of impact resistance, penetration resistance, adhesiveness, transparency and the like.

The thickness of the bonding intermediate films 5A and 5B is preferably, for example, about 10 to 1000 μm. Since the near-infrared cut layer is weak to heat and cannot withstand the heat crosslinking temperature (130 to 150 ° C.), the near-infrared cut film 4 and the antireflection / near-infrared cut film 9 may be laminated using an adhesive. . However, low-temperature crosslinking EVA (crosslinking temperature 70 to
130 ° C), this near infrared cut film 4
And anti-reflection / near infrared cut film 9 can be used for bonding.

The bonding interlayers 5A and 5B may further contain a small amount of an ultraviolet absorber, an infrared absorber, an antioxidant, and a coating processing aid, and may adjust the color of the filter itself. Colorants such as dyes and pigments, and fillers such as carbon black, hydrophobic silica, and calcium carbonate may be added in appropriate amounts.

As means for improving the adhesiveness, means such as corona discharge treatment, low-temperature plasma treatment, electron beam irradiation, and ultraviolet light irradiation on the surface of the adhesive intermediate film formed into a sheet are also effective.

This adhesive intermediate film is prepared by mixing an adhesive resin and the above-mentioned additives, kneading the mixture with an extruder, a roll, or the like, and then forming the mixture into a predetermined shape by a film forming method such as calendar, roll, T-die extrusion, or inflation. It is manufactured by forming a sheet. At the time of film formation, embossing is applied to prevent blocking and facilitate degassing during pressure bonding.

In addition to the EVA resin, a PVB resin can be suitably used as described above. This PVB
The resin is preferably such that the polyvinyl acetal unit is 70 to 95% by weight, the polyvinyl acetate unit is 1 to 15% by weight, and the average degree of polymerization is 200 to 3000, preferably 300 to 2500, and the PVB resin is a plasticizer. It is used as a resin composition containing.

As the pressure-sensitive adhesive (pressure-sensitive adhesive) of the pressure-sensitive adhesive layer 6 as the rearmost layer of the electromagnetic wave shielding light-transmitting laminated film of the present invention, acrylic elastomers, thermoplastic elastomers such as SBS, SEBS and the like are preferably used. Used. To these pressure-sensitive adhesives, tackifiers, ultraviolet absorbers, coloring pigments, coloring dyes, antioxidants, adhesion-imparting agents, and the like can be appropriately added. The thickness of the pressure-sensitive adhesive layer 6 is preferably about 10 to 1000 μm.

As shown in the figure, the conductive adhesive tape 7 is provided with an adhesive layer 7B in which conductive particles are dispersed on one surface of a metal foil 7A. It is possible to use a resin, rubber-based, silicone-based pressure-sensitive adhesive, or an epoxy-based, phenol-based resin mixed with a curing agent.

As the conductive particles dispersed in the adhesive layer 7B, various types of conductive particles may be used as long as they are electrically good conductors. For example, metal powder such as copper, silver, and nickel, resin or ceramic powder coated with such a metal can be used. There is no particular limitation on the shape, and any shape such as a scale shape, a tree shape, a granular shape, and a pellet shape can be adopted.

The amount of the conductive particles is preferably 0.1 to 15% by volume based on the polymer constituting the adhesive layer 7B, and the average particle size is 0.1 to 100 μm.
It is preferred that As described above, by defining the blending amount and the particle size, it is possible to prevent the conductive particles from condensing and obtain good conductivity.

Metal foil 7 serving as base material of conductive adhesive tape 7
As A, a foil of copper, silver, nickel, aluminum, stainless steel or the like can be used, and its thickness is usually about 1 to 100 μm.

The adhesive layer 7B is prepared by uniformly mixing the above-mentioned adhesive and conductive particles at a predetermined ratio on the metal foil 7A, using a roll coater, a die coater, a knife coater, a my cover coater, a flow coater, and a sprayer. It can be easily formed by coating with a coater or the like.

The thickness of the adhesive layer 7B is usually 5 to 1
It is about 00 μm.

In order to manufacture the electromagnetic wave shielding light transmitting laminated film 1 shown in FIG. 1, an antireflection film 2, a conductive mesh 3, a near-infrared cut film 4, adhesive intermediate films 5A and 5B and a conductive The adhesive tape 7 is prepared, and the antireflection film 2, the bonding intermediate film 5A, the conductive mesh 3, the bonding intermediate film 5B, and the near-infrared cut film 4 are laminated, and the protrusion 3A of the conductive mesh 3 is formed as an antireflection film. 2, and the folded portion 3B is fastened with a conductive adhesive tape 7.

Thereafter, the laminate is crosslinked by heating or irradiation with light to integrate the laminate. In this case, the bonding intermediate films 5A, 5A
B. The cross-linking of the adhesive layer 7B of the tape 7 can be performed all at once. Thereafter, an adhesive layer 6 is formed on the surface of the near-infrared cut film 4 of the laminate. An appropriate release paper (film) is bonded to the pressure-sensitive adhesive layer 6.

To manufacture the electromagnetic wave shielding light transmitting laminated film 1A of FIG. 2, the antireflection film 2, the bonding intermediate film 5A, the near infrared cut film 4, the bonding intermediate film 5
B, the transparent conductive film 8 is laminated, the protruding portion 8A of the transparent conductive film 8 is folded back to the surface side of the antireflection film 2, and the folded portion 8B is fastened with the conductive adhesive tape 7, and then the same as above. Then, the pressure-sensitive adhesive layer 6 is formed.

In order to manufacture the electromagnetic wave shielding light transmitting laminated film 1B shown in FIG. 3, an antireflection / near infrared cut film 9, an adhesive intermediate film 5A and a transparent conductive film 8 are laminated. The protruding portion 8A is folded back to the front side of the anti-reflection / near-infrared cut film 9, the folded portion 8B is fastened with a conductive adhesive tape 7, and then crosslinked and integrated in the same manner as described above. Form.

After the conductive adhesive tape 7 is attached to the conductive mesh 3 or the transparent conductive film 8 in advance,
They may be laminated and integrated.

In any of FIGS. 1 to 3, an adhesive may be used instead of part or all of the bonding intermediate films 5A and 5B.

When a cross-linked conductive pressure-sensitive adhesive tape is used as the conductive pressure-sensitive adhesive tape 7, the pressure-sensitive adhesive is adhered to the laminate by utilizing the adhesiveness of the pressure-sensitive adhesive layer 7B. (This temporary fastening can be reattached if necessary.)
The adhesive layer 7 forms a strong adhesion layer by heating or irradiating with ultraviolet rays while applying pressure as necessary.
Heating may be performed at the same time as the ultraviolet irradiation. In addition, by locally performing the heating or the light irradiation, it is possible to adhere only a part of the cross-linkable conductive adhesive tape.

The heat bonding can be easily performed by a general heat sealer. As a method of heating under pressure, a laminate having a cross-linked conductive pressure-sensitive adhesive tape adhered thereto is placed in a vacuum bag and degassed. The method of heating may be used, and the bonding can be performed very easily.

The bonding conditions are as follows in the case of thermal crosslinking:
Although it depends on the type of the crosslinking agent (organic peroxide) to be used, it is usually 70 to 150 ° C, preferably 70 to 130 ° C, and usually 10 seconds to 120 minutes, preferably 20 seconds to 60 minutes.

In the case of photocrosslinking, the light source is ultraviolet to
Many light sources that emit light in the visible region can be used, and examples thereof include ultra-high pressure, high pressure, low pressure mercury lamps, chemical lamps, xenon lamps, halogen lamps, mercury halogen lamps, carbon arc lamps, incandescent lamps, and laser light.
The irradiation time is not generally determined depending on the type of the lamp and the intensity of the light source, but is usually several tens seconds to several tens of minutes. After heating to 40 to 120 ° C. in advance to promote cross-linking, this may be irradiated with ultraviolet rays.

The pressure at the time of bonding is also appropriately selected, and is usually 5 to 50 kg / cm ² , particularly 10 to 30 kg / cm ² .
/ Cm ² is preferable.

As shown in FIG. 5, the thus manufactured electromagnetic wave shielding light transmitting laminated films 1, 1A, 1B are simply attached to the front panel (PDP panel) 20 of the PDP with the adhesive layer 6. It can be easily attached, and it is very simply and reliably incorporated into the housing simply by fitting it into the housing, and good conduction between the conductive mesh or the transparent conductive film and the housing via the conductive adhesive tape 7. At the peripheral edge thereof. Therefore, a good electromagnetic wave shielding effect can be obtained. Further, good near-infrared cut performance can be obtained by the near-infrared cut film. Furthermore, since it is a film, it is thin and lightweight.

Such an electromagnetic wave shielding light transmitting laminated film of the present invention is applied as an electromagnetic wave shielding light transmitting laminated film to be adhered to a PDP panel, or to a window material at a place where precision equipment is installed, such as a hospital or a laboratory. It is very suitable as an electromagnetic wave shielding light transmitting laminated film or the like to be attached.

[0088]

As described above in detail, according to the present invention, it is possible to obtain a light and thin image having good electromagnetic wave shielding performance and near-infrared ray cutting performance, and a light-transmitting and clear image. Moreover, the electromagnetic wave shielding light can easily be grounded to the PDP, and can provide these electromagnetic wave shielding performance, near-infrared cut-off performance and good light transmittance only by sticking to the front panel of the PDP. A transmission laminated film and a display panel using such an electromagnetic wave shielding light transmission laminated film are provided.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing an electromagnetic wave shielding light transmitting laminated film according to a first embodiment.

FIG. 2 is a schematic cross-sectional view showing an electromagnetic wave shielding light transmitting laminated film according to a second embodiment.

FIG. 3 is a schematic sectional view showing an electromagnetic wave shielding light transmitting laminated film according to a third embodiment.

FIG. 4 is a schematic sectional view showing a configuration of a near-infrared cut layer.

5A and 5B are diagrams showing an embodiment of the display panel of the present invention, wherein FIG. 5A is a plan view and FIG. 5B is a view taken along line BB of FIG.
It is sectional drawing which follows a line.

[Explanation of symbols]

 1, 1A, 1B Electromagnetic wave shielding light transmitting laminated film 2 Antireflection film 3 Conductive mesh 4 Near infrared cut film 5A, 5B Adhesive intermediate film 6 Adhesive layer 7 Conductive adhesive tape 7A Metal foil 7B Adhesive layer 8 Transparent conductive Film 9 Anti-reflection / Near-infrared cut film 20 PDP panel

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (reference) H05K 9/00 H05K 9/00 VF term (reference) 2H048 CA12 CA24 CA27 4F100 AA25 AA28 AA33 AB01A AB17 AB24 AK01A AK17 AK25 AK42 AK52 AR00A AR00B AR00C AR00D BA04 BA07 BA10A BA10D CA07G CB05 CB05D DB07A DB07B DB07C DG01A DG07A EH51A GB41 GB90 JD08 JD08A JD09 JD10C JD12 JD20C JL03 JL13D JN01A JN01G JN06B JN08 5E321 AA04 BB23 BB25 BB41 BB44 CC16 GG05 GH01 5G435 AA00 AA18 GG00 GG33 HH01 KK05 LL07

Claims (7)

[Claims] An electromagnetic wave shielding light-transmitting laminated film comprising an electromagnetic wave shielding material, an outermost antireflection film, and a near-infrared cut film laminated and integrated, and provided with an adhesive layer as a rearmost layer. The edge of the electromagnetic wave shielding material protrudes from the edge of the anti-reflection film and is folded back along the edge of the anti-reflection film toward the surface of the anti-reflection film. An electromagnetic wave shielding light-transmitting laminated film, which is fixed to the surface of the antireflection film with a conductive adhesive tape. 2. The electromagnetic wave shielding light transmitting laminated film according to claim 1, wherein the electromagnetic wave shielding material is made of a mesh of a metal fiber and / or a metal-coated organic fiber or a transparent conductive film. 3. An electromagnetic wave shielding light-transmitting laminated film in which an electromagnetic wave shielding material and an antireflection / near-infrared cut film on the outermost layer are laminated and integrated, and an adhesive layer is provided as a rearmost layer. The edge of the electromagnetic wave shielding material protrudes from the edge of the anti-reflection / near-infrared cut film, and is folded back along the edge of the anti-reflection / near-infrared cut film toward the front side of the anti-reflection / near-infrared cut film. An electromagnetic wave shielding light transmitting laminated film, wherein a folded portion of the electromagnetic wave shielding material is fixed to the surface of the antireflection / near infrared cut film with a conductive adhesive tape. 4. The electromagnetic wave shielding light-transmitting laminated film according to claim 3, wherein the electromagnetic wave shielding material is a transparent conductive film. 5. The electromagnetic wave shielding light-transmitting laminated film according to claim 1, wherein the laminated film is integrated with a transparent adhesive. 6. An electromagnetic wave shielding light transmitting laminated film according to claim 5, wherein said transparent adhesive contains an ultraviolet absorber. 7. A display panel having the electromagnetic-shielding light-transmitting laminated film according to claim 1 attached to a front surface thereof.