JP5219970B2 - Electromagnetic wave shielding material and manufacturing method thereof - Google Patents

Description

  The present invention generally relates to an electromagnetic shielding material, and more particularly to an electromagnetic shielding material improved so as not to warp even when used in an environment with a large temperature difference. The present invention also relates to a method for producing such an electromagnetic shielding material.

  Conventionally, as a transparent base material for electromagnetic shielding, a technique for shielding harmful electromagnetic waves by coating a transparent conductive film such as gold or ITO (indium tin oxide) on the surface of a window member made of transparent resin or inorganic glass is known. It has been.

  However, when the transparent conductive film is coated on the window member, there is a problem that it is difficult to coat the window member uniformly. Moreover, since it is necessary to coat thickly in order to improve electromagnetic wave shielding performance, if electromagnetic wave shielding performance is improved, transparency will fall and it was difficult to make transparency and electromagnetic wave shielding performance compatible.

  Therefore, Patent Document 1 discloses a method of manufacturing a window having electromagnetic wave shielding properties by forming a thin film made of a conductive material on the surface of a transparent window member and processing the thin film to form a mesh shape. ing. According to this method, since a fine mesh is formed by a photoetching method in a later step, the transparency is greatly reduced without unevenness such as unevenness after coating as in the case of coating a transparent conductive film. In addition, it can be formed in a mesh shape with a uniform density and impart electromagnetic wave shielding properties.

JP-A-2005-104310

  However, a mesh-shaped thin film made of a conductive material formed on the surface of a transparent window member breaks down when exposed to wind, snow, rain, or due to large fluctuations in pressure or outside temperature during flight. There was a problem in terms of durability and weather resistance. In such a case, it is conceivable to apply a conventional electromagnetic shielding material used for a plasma display panel, which will be described later. However, when it is attached to, for example, a window glass in an outdoor environment with a large temperature difference, the linear expansion of the bonded members There was a problem that warping occurred due to the difference in rate. In particular, warpage is remarkable in window materials for automobile windows, military vehicle windows and displays, military jet planes, and commercial aircraft, which have a severe temperature change.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide an improved electromagnetic shielding material that does not warp even when used in an environment with a large temperature difference.

  Another object of the present invention is to provide a method for producing an electromagnetic wave shielding material that is less curled or deformed when an electromagnetic wave shielding film having a conductive pattern printed on a transparent resin film is bonded to a transparent support substrate by heating and pressing. There is to do.

  The electromagnetic wave shielding material according to the present invention includes a transparent resin film, an ink receiving layer provided on one surface of the transparent resin film for preventing bleeding of the conductive paste ink, and an ink receiving layer on the ink receiving layer. The transparent resin bonded to the one surface of the transparent resin film so as to sandwich the electromagnetic wave shield mesh layer provided between the electromagnetic wave shield mesh layer and the electromagnetic wave shield mesh layer. A transparent support substrate having a linear expansion coefficient within 30 ppm is provided.

  If the difference in linear expansion coefficient between the transparent resin film and the transparent support substrate is within 30 ppm, more preferably 20 ppm or less, no warpage is observed even when used in a window used in an environment with a large temperature difference. . Moreover, if the difference in linear expansion coefficient is within 30 ppm, curling and deformation are less when an electromagnetic wave shielding film having a conductive pattern printed on a transparent resin film is bonded to a transparent support substrate by heating and pressing.

  In conventional electromagnetic shielding materials used for plasma display panels, an acrylic resin substrate is used as the transparent support substrate, and a PET transparent resin film having an electromagnetic shielding mesh layer formed on the surface is bonded to the transparent support substrate. ing. In this case, the linear expansion coefficient of the PET film is 30 ppm, and the linear expansion coefficient of the acrylic resin base material is 65 ppm, and the difference between the two is large. However, warping does not occur even if there is such a difference in linear expansion coefficient when used in an environment where the temperature difference is small, such as a consumer television.

  However, when a conventional electromagnetic shielding material using a PET film is used as it is in an environment with a large temperature difference, for example, when it is attached to an aircraft window glass, a difference in linear expansion coefficient affects and warpage occurs.

Therefore, according to this onset bright, an electromagnetic wave shielding mesh layer formed on the surface of the transparent resin film formed with a cyclic olefin resin, paste it into a transparent supporting substrate such as an acrylic resin. Since the linear olefin-based resin film has a linear expansion coefficient of 65 ppm and the acrylic resin has a linear expansion coefficient of 65 ppm, no warpage occurs even when used in an environment with a large temperature difference. Since the warp does not occur if the difference in linear expansion coefficient is within 30 ppm, the transparent support substrate to which the cyclic olefin-based resin film is bonded can be formed of a polycarbonate-based resin.

  On the other hand, the surface of the cyclic olefin-based resin film and the polycarbonate-based resin film had a problem of poor wettability and adhesiveness, but the wet tension of the surface was measured on the surface on which the electromagnetic wave shielding mesh layer was formed. It was recognized that such a problem was solved when the surface modification treatment was performed at a temperature of 23 ° C. so as to be 450 μN / cm or more.

  The thickness of the transparent resin film is preferably 20 to 200 μm.

  The film thickness of the transparent support substrate is preferably 1 to 10 mm.

  The transparent resin film and the transparent support substrate are bonded together with a transparent pressure-sensitive adhesive (PSA), a hot melt adhesive, a one-part curable adhesive, and a two-part mixed adhesive.

  As the transparent resin film, a cyclic olefin resin film having a refractive index of 1.49 to 1.55 and a light transmittance of 93.0 to 90.8% is preferably used. Thus, by selecting the refractive index and the light transmittance, the transparency is not lowered when used for the window portion.

As the cyclic olefin-based resin, a resin obtained by ring-opening polymerization of norbornene as shown in Chemical Formula 1 or a resin obtained by copolymerizing norbornene and ethylene as shown in Chemical Formula 2 is selected. The refractive index and light transmittance can be set within the above-described preferable ranges. In formula, R1, R2 represents a substituent. n is a natural number. X and Y represent ratios.

  In the method for producing an electromagnetic wave shielding material according to another aspect of the present invention, first, the wet tension of the surface of one side of the transparent resin film formed of the cyclic olefin resin is 450 μN / cm at a measurement temperature of 23 ° C. Surface modification treatment is performed so as to be equal to or more than cm. An ink receiving layer for preventing bleeding of the conductive paste ink is formed on one surface of the transparent resin film. A conductive paste ink layer is formed on the ink receiving layer, patterned into a mesh shape, and then baked to form an electromagnetic wave shielding mesh layer. A transparent support substrate formed of an acrylic resin or a polycarbonate resin is bonded to one surface of the transparent resin film so as to sandwich the electromagnetic wave shielding mesh layer.

  The surface modification treatment is preferably performed so that the surface wetting tension is 500 μN / cm or more at a measurement temperature of 23 ° C.

  According to the electromagnetic wave shielding material according to the present invention, since the difference in linear expansion coefficient between the transparent resin film and the transparent support substrate is within 30 ppm, when used for an airplane window used in an environment with a large temperature difference. However, no warpage is recognized. In addition, when an electromagnetic wave shielding film having a conductive pattern printed on a transparent resin film is bonded to a transparent support substrate by heating and pressing, if the difference in linear expansion coefficient is within 30 ppm, more preferably 20 ppm or less, curling or deformation Less is.

It is a disassembled perspective view of the electromagnetic wave shielding material which concerns on Example 1 of this invention. It is a top view of the transparent resin film in which the electromagnetic wave shielding mesh layer was formed. (A) It is sectional drawing which follows the III-III line in FIG. (B) It is an enlarged view of the electromagnetic wave shield mesh layer part. It is a conceptual diagram at the time of using the electromagnetic wave shielding material being inserted | pinched between two glass which comprises the window of an aircraft, for example. It is sectional drawing which shows the manufacturing method of the electromagnetic wave shielding material which concerns on Example 2 of this invention in order of a process. It is the perspective view (A) of the aircraft window material which concerns on Example 3 of this invention, and its sectional drawing (B).

  For the purpose of obtaining an electromagnetic shielding material improved so as not to warp even when used in an environment with a large temperature difference, an electromagnetic shielding mesh layer is provided on one side of a transparent resin film formed of a cyclic olefin resin. This was realized by bonding it to a transparent support substrate formed of an acrylic resin or a polycarbonate resin. Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is an exploded perspective view of an electromagnetic wave shielding material according to the present invention.

The electromagnetic wave shielding material 1 includes a transparent resin film 2 made of a cyclic olefin resin and having an electromagnetic wave shielding mesh layer formed on one surface thereof. A transparent support substrate 4 formed of an acrylic resin or a polycarbonate resin is heated on one surface of the transparent resin film 2 so as to sandwich the electromagnetic wave shielding mesh layer with a hot melt adhesive 3. It is pressed together. The optimum conditions for heating and pressurization may be determined as appropriate depending on the combination of materials used. In general, conditions of 100 ° C., 18 kg / cm ² and 1 hour are suitable.

  According to this example, an electromagnetic wave shielding film obtained by printing a conductive pattern on a transparent resin film formed of a cyclic olefin resin is applied to a transparent support substrate formed of an acrylic resin or a polycarbonate resin by heat and pressure. When matching, the linear expansion coefficient matches, so there is little curling or deformation. In addition, when PET resin is used instead of cyclic olefin resin, since the linear expansion coefficient of PET film is 30 ppm, the difference from the linear expansion coefficient of 65 ppm of acrylic resin is 35 ppm, and warping occurs as a phenomenon.

  The transparent support substrate 4 provides strength and waist required for the electromagnetic wave shielding film. Among these, acrylic resin or polycarbonate resin is preferable from the viewpoint of transparency, cost, durability, heat resistance, and the like.

  Here, the transparency in the transparent support substrate 4 is not particularly limited as long as it is transparent enough to be used for aircraft windows. Usually, it means that the total light transmittance measured by JIS K7105 is about 85 to 90%, and the haze value measured by JIS K7105 is about 0.1 to 3%.

  Although it does not specifically limit as thickness of the transparent support base material 4, A preferable minimum is 10 micrometers and a preferable upper limit is 300 micrometers. If the thickness is less than 10 μm, it may be too thin to cause folds or wrinkles, which may cause problems in handling in the processing process. If it exceeds 300 μm, the thickness is too thick and the flexibility is reduced. This is an obstacle to continuous processing of material films. A more preferable lower limit is 20 μm, and a more preferable upper limit is 200 μm.

  2 is a plan view of the transparent resin film 2 on which the electromagnetic wave shielding mesh layer is formed, and FIG. 3A is a cross-sectional view taken along line III-III in FIG. FIG. 3B is an enlarged view of the electromagnetic shielding mesh layer portion.

  With reference to these drawings, the transparent resin film 2 includes a cyclic olefin-based resin film 5. One surface of the cyclic olefin-based resin film 5 is subjected to surface modification treatment such as frame treatment, ultraviolet treatment, corona treatment, plasma treatment, itro treatment, primer treatment, and chemical treatment. In the figure, this is represented by a cross. This treatment (x) improves the wettability and adhesion of the surface.

  On one surface of the cyclic olefin-based resin film 5 after the surface modification treatment, an ink receiving layer 6 (thickness 1 μm) for preventing bleeding (line thickening) of the conductive paste ink is provided. Since the surface modification treatment is performed, the familiarity between the cyclic olefin resin film 5 and the ink receiving layer 6 is excellent. On the ink receiving layer 6, an electromagnetic wave shielding mesh layer 7 formed by baking conductive paste ink is provided. Although heat is applied by this firing, the cyclic olefin-based resin film 5 has heat resistance, so that deformation or the like does not occur.

  The electromagnetic shielding mesh layer 7 is formed in a lattice shape by screen printing using, for example, a silver paste made of conductive powder and a binder. According to screen printing, the inclination angle θ of the electromagnetic wave shielding mesh layer 7 is in the range of 20 ° to 50 °.

  Referring to FIG. 4, electromagnetic wave shielding material 1 formed in this way is used by being sandwiched between, for example, two sheets of glass 8 and 8 constituting an aircraft window. According to this example, the linear olefin resin film constituting the electromagnetic wave shielding material 1 has a linear expansion coefficient of 65 ppm, and the linear expansion coefficient of the acrylic resin that is the transparent support base material is 65 ppm. Even when used in an environment, no warping occurs. The structure in which the electromagnetic shielding material 1 is sandwiched between the two glasses 8 and 8 allows the window to be exposed to wind, snow, and rain, and to receive large fluctuations in pressure and outside temperature during flight. The electromagnetic shielding material 1 is excellent in durability and weather resistance without being damaged such as breaking.

  With reference to FIG. 5, the manufacturing method of an electromagnetic wave shielding material is demonstrated.

  With reference to FIG. 5 (A), first, a transparent resin film 5 formed of a cyclic olefin-based resin is prepared. Referring to FIG. 5B, surface modification treatment is performed on one surface of the transparent resin film 5 so that the wetting tension of the surface becomes 450 μN / cm or more at a measurement temperature of 23 ° C. Represents the result of surface modification).

  Referring to FIG. 5C, an ink receiving layer 6 for preventing bleeding of the conductive paste ink is formed on one surface of the transparent resin film 5.

  Referring to FIG. 5D, an electromagnetic wave shielding mesh layer 7 is formed by forming a conductive paste ink layer in a mesh shape on the ink receiving layer 6 and then baking it. As a result, a transparent resin film formed of a cyclic olefin-based resin having an electromagnetic shielding mesh layer formed on one surface thereof is completed.

  Referring to FIG. 5 (E), the acrylic resin is heated and pressurized using hot melt adhesive 3 on one surface of transparent resin film 5 so as to sandwich electromagnetic wave shielding mesh layer 7 therebetween. Or the transparent support base material 4 formed with the polycarbonate-type resin is bonded together. Thereby, the electromagnetic wave shielding material 1 is completed. When the electromagnetic shielding film having a conductive pattern printed on the transparent resin film is bonded to the transparent support substrate by heating and pressing, the linear expansion coefficient is matched, so curling and deformation are small.

  Hereinafter, points to be noted in manufacturing the cyclic olefin-based resin film 5 subjected to the surface modification treatment, which is a main element of the present invention, will be described.

(Cyclic olefin resin)
Specifically, as the cyclic olefin resin, (a) a polymer obtained by hydrogenating a ring-opened (co) polymer of cyclic olefin as necessary, (b) an addition (co) polymer of cyclic olefin, (c) cyclic Examples thereof include random copolymers of olefins and α-olefins such as ethylene and propylene, and (d) graft modified products obtained by modifying the above (a) to (c) with unsaturated carboxylic acids or derivatives thereof. The cyclic olefin is not particularly limited, and examples thereof include norbornene, tetracyclododecene, and derivatives thereof (for example, those having a carboxyl group or an ester group).

  A commercial item can be used as cyclic olefin resin. Examples of commercially available products include those manufactured by ZEON Corporation, trade names “ZEONOR (registered trademark)”, “ZEONEX (registered trademark)”, manufactured by JSR Corporation, trade names “ARTON (registered trademark)”, manufactured by Mitsui Chemicals, Inc. The name “APEL (registered trademark)”, a product name “TOPAS (registered trademark)” manufactured by TOPAS Advanced Polymers, and the like can be given.

  The water absorption (23 ° C./24 hours) of the cyclic olefin resin used in the present invention is usually preferably 0.005 to 0.1%. When the water absorption exceeds 0.1%, the gas barrier property of the obtained substrate tends to be lowered.

  The cyclic olefin resin used in the present invention preferably has a refractive index of 1.49 to 1.55 and a light transmittance of 93.0 to 90.8%.

  Various known additives such as an ultraviolet absorber, an inorganic or organic antiblocking agent, a lubricant, an antistatic agent, and a stabilizer may be added to the cyclic olefin resin for a proper purpose.

(Film production method)
The method for obtaining a film from the cyclic olefin-based resin is not particularly limited, and examples thereof include a solution casting method, an extrusion method, and a calendar method.

(surface treatment)
In order to improve the wettability and adhesion of the surface of the cyclic olefin-based resin film 5, flame treatment, ultraviolet irradiation treatment, corona discharge treatment, plasma treatment, intro treatment, primer treatment, chemical treatment, etc. Surface modification treatment is performed. The corona discharge treatment and the ultraviolet irradiation treatment can be performed in air, nitrogen gas, rare gas, or the like. By such surface modification treatment, the wetting tension of the surface of the cyclic olefin resin film can be set to 450 μN / cm or more, more preferably 500 μN / cm at a measurement temperature of 23 ° C. .

(Stretching)
The method for controlling the retardation by stretching the cyclic olefin-based resin film is not particularly limited, and examples thereof include a roll stretching method, a tenter clip stretching method, and a rolling method.

  (Regarding phase difference)

  By using a retardation film formed by stretching a cyclic olefin resin film, it can be more suitably used for LCD applications and the like. The meaning of imparting the phase difference function is optical compensation in the case of LCD applications. In addition, in order to reduce the reflected light from the internal structure of the display by the circular polarization function, conventionally, this effect has been obtained by further laminating a retardation film on the polarizing plate. By providing a retardation function to the display substrate film, thickness reduction and cost reduction are achieved.

  (Specific examples)

1) A copolymer of norbornene and ethylene (TOPAS Advanced Polymers, Topas 6017, glass transition point 180 ° C.) is melt-molded by a T-die method under conditions of a resin temperature of 270 ° C. and a take-up roll temperature of 140 ° C. A film having a thickness of 200 μm was formed. Both surfaces of the obtained film were subjected to corona discharge treatment in air at a treatment strength of 100 W / m ² · min, so that the wetting tension was 500 μN / cm (23 ° C.).

2) A film having a thickness of 150 μm was formed from a cyclic olefin resin (ZEONOR1600R manufactured by Nippon Zeon Co., Ltd.) by a melt molding T-die method under the conditions of a resin temperature of 250 ° C. and a take-up roll temperature of 110 ° C. Both surfaces of the obtained film were subjected to corona discharge treatment in air at a treatment strength of 100 W / m ² · min, so that the wetting tension was 500 μN / cm (23 ° C.).

3) 30 parts by weight of a cyclic olefin-based resin (ZEONEX 490K, manufactured by Nippon Zeon Co., Ltd.) was dissolved in 70 parts by weight of xylene as a casting solution, and a film having a thickness of 100 μm was formed by the casting method. Both surfaces of the obtained film were subjected to corona discharge treatment in air at a treatment strength of 100 W / m ² · min, so that the wetting tension was 500 μN / cm (23 ° C.).

  In the above embodiment, an acrylic resin or a polycarbonate resin is exemplified as the transparent support substrate. However, the difference in linear expansion coefficient between the transparent resin film and the transparent support substrate is 30 ppm (3 × 10E-5 / ° C.). Any combination that is within the range can be used.

Transparent resin films include polyester resin films such as polyethylene terephthalate and polyethylene naphthalate, cyclic olefin resin films, polycarbonate resin films, poly (meth) acrylate resin films, silicone resin films, and polyarylate resin films. , A polyethersulfone resin film, a polyimide resin film, and a polystyrene resin film.
As for Charpy impact strength (kJ / m ² ) and linear expansion coefficient (ppm), for example, cyclic polyolefin resin “Topas6017S-04” (manufactured by TOPAS Advanced Polymers) is 1.6 kJ / m ² and 65 ppm, respectively. , PMMA (Parapet HR-L (optical / heat resistant) manufactured by Kuraray Co., Ltd.) is 1.4 KJ / m ² and 70 ppm, and PC (polycarbonate) (Panlite AD-5503 (optical) manufactured by Teijin Chemicals Limited) is 3 kJ / m ² and 70 ppm, PC (polycarbonate) (Iupilon H-4000 (disk) manufactured by Mitsubishi Gas Chemical Co., Ltd.) is 7 kJ / m ² and 70 ppm, and PES (polyether sulfone) (BASF Japan shares) company made Ultra zone E2010) is, 6kJ / m ^2, 55p A m.

  The transparent resin substrate is selected from a (meth) acrylic ester resin substrate, a polycarbonate resin substrate, a silicone resin substrate, a polyarylate resin substrate, and a polystyrene resin substrate. The transparent resin substrate may be used as it is or may be stretched. It can be used more suitably by strengthening the acrylic plate by stretching.

  The transparent adhesive is selected from a film or solution of a polyvinyl butyral resin, a urethane resin, an acrylic resin, an ethylene vinyl acetate resin, or a polyolefin resin as a hot melt adhesive. As pressure sensitive adhesive, water-based adhesive, vinyl acetate-based, ethylene vinyl acetate-based, acrylic-based, latex-based such as styrene-acrylic, SBR, solvent-based, vinyl acetate-based, acrylic-based, styrene-acrylic-based, solventless Epoxy-based, polyester-based, cyanoacrylate resins, and the like can be used as appropriate.

  Hereinafter, an embodiment of the present invention applied to an aircraft window will be described. FIG. 6A shows an aircraft window member 11 used for, for example, a cabin window. The aircraft window member 11 has a flat plate shape, but may have a curved surface shape depending on the position to which it is applied. The aircraft window member 11 includes a window main body 13 serving as a substrate, a film 15 attached on the window main body 13, and a conductive mesh 17 formed on the film 15. The aircraft window member 11 has an electromagnetic wave shielding property due to the conductive mesh 17 and also has a light transmittance for securing a field of view. For example, the visible light transmittance is about 90%.

  FIG. 6B shows a partial cross-sectional view at the end of the aircraft window member 11. As shown in the figure, a conductive mesh 17 and a film 15 are laminated in this order on the window main body 13 via an adhesive layer 19. The window main body 13 is made of acrylic resin, more specifically, PMMA (methyl methacrylate resin). The film 15 is formed of a cyclic olefin resin. The thickness of the film 15 is, for example, 125 μm. The conductive mesh 17 is formed in a lattice shape, and both electromagnetic shielding properties and ensuring visibility are compatible. Since the film 15 formed of the cyclic olefin resin and the window main body 13 formed of the acrylic resin or the polycarbonate resin have the same linear expansion coefficient, curling and Less deformation.

The adhesive layer 19 is formed of a urethane adhesive. After bonding, the adhesive layer 19 enters the space between the film 15 and the conductive mesh 17 and directly contacts the conductive material of the conductive mesh 17 so as to cover the conductive material. The aircraft window member 11 having the above-described configuration is manufactured by the method described in Example 2, and the film 15 with the conductive mesh 17 is obtained. And after installing the adhesive layer 19 made into the sheet-like urethane adhesive on the window main body 13, the film 15 is stuck so that the electroconductive mesh 17 may oppose the window main body 13. FIG. Next, heat treatment is performed using an autoclave to cure the adhesive layer 19 and fix the film 15 on the window body 13. As processing conditions by the autoclave, a temperature of 85 to 95 ° C., a pressure of 1.03 MPa, and a processing time of 1 hour are preferable. And the window material 11 for aircrafts is obtained by taking out from an autoclave and cooling. The aircraft window member 11 manufactured in this way is assembled to a window frame or the like later to obtain an aircraft window assembly.
It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The electromagnetic wave shielding material according to the present invention does not warp even when used in an environment with a large temperature difference.

DESCRIPTION OF SYMBOLS 1 Electromagnetic shielding material 2 Transparent resin film 3 Hot melt adhesive 4 Transparent support base material 5 Cyclic olefin resin film 6 Ink receiving layer 7 Electromagnetic wave shielding mesh layer 8 Glass 11 Aircraft window material 13 Window body 15 Film 17 Conductive mesh 19 Adhesive layer

Claims (8)

A transparent resin film,
An ink receiving layer provided on one surface of the transparent resin film for preventing bleeding of the conductive paste;
An electromagnetic wave shielding mesh layer provided on the ink receiving layer and formed by firing conductive paste ink;
A transparent support substrate having a linear expansion coefficient of 30 ppm or less, which is bonded to the one surface of the transparent resin film so that the electromagnetic wave shielding mesh layer is sandwiched between the transparent resin film and the linear expansion coefficient. And comprising
The transparent resin film is formed of a cyclic olefin resin,
The transparent support substrate is an electromagnetic wave shielding material formed of an acrylic resin or a polycarbonate resin . The one surface of the transparent resin film is subjected to a surface modification treatment so that the wetting tension of the surface is 450 μN / cm or more at a measurement temperature of 23 ° C., and the ink receiving layer is formed thereon. The electromagnetic wave shielding material according to claim 1 . The electromagnetic wave shielding material according to claim 1, wherein the transparent resin film has a thickness of 20 to 200 μm. The thickness of the transparent supporting substrate, an electromagnetic wave shielding material according to any one of claims 1 to 3, which is 1 to 10 mm. The electromagnetic wave shielding material according to any one of claims 1 to 4 , wherein the transparent resin film has a refractive index of 1.49 to 1.55 and a light transmittance of 93.0 to 90.8%. The transparent resin film comprises (a) a polymer obtained by hydrogenating a ring-opening (co) polymer of a cyclic olefin as necessary, (b) an addition (co) polymer of a cyclic olefin, (c) a cyclic olefin and ethylene, random copolymers of propylene, such as α- olefins, in claim 5, which is formed in one of a graft-modified product modified with; (d) (a) ~ (c) is or unsaturated carboxylic acid derivatives thereof The electromagnetic wave shielding material as described. A surface modification treatment on one surface of a transparent resin film formed of a cyclic olefin-based resin so that the wetting tension of the surface is 450 μN / cm or more at a measurement temperature of 23 ° C .;
Forming an ink receiving layer on one surface of the transparent resin film to prevent bleeding of the conductive paste ink;
Forming a conductive paste ink layer on the ink receiving layer, patterning it into a mesh, and then baking to form an electromagnetic shielding mesh layer; and
A step of laminating a transparent support substrate formed of an acrylic resin or a polycarbonate resin on one surface of the transparent resin film so as to sandwich the electromagnetic wave shielding mesh layer. Manufacturing method. The said surface modification process is a manufacturing method of the electromagnetic wave shielding material of Claim 7 performed so that the wetting tension | tensile_strength of a surface may be 500 microN / cm or more at the measurement temperature of 23 degreeC.

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