JP5085213B2 - Translucent conductive film and method for producing the same - Google Patents

Description

The present invention relates to a translucent conductive film and a method for manufacturing the same, and in particular, for a display that blocks electromagnetic waves generated from the front surface of a display such as a CRT (Brown Tube), PDP (Plasma Display Panel), EL (Electroluminescence), or panel. The present invention relates to a translucent conductive film.

Conventionally, a display is typically a CRT (CRT) display, but recently, a flat panel display (FPD) has been widely used as a thin TV or the like. Among FPDs, LCD (Liquid Crystal Display) and PDP (Plasma Display Panel) are pioneering, but in the future, in addition to these, SED (Surface-conduction Electron-emitter Display) etc. The spread of FED (Field Emission Display), which attracts attention, is also expected.

  In such various displays, electromagnetic waves are generated from pixel drive signals and the like. In order to shield the electromagnetic waves generated from these displays, for example, in the case of PDP and CRT described above, it is known that an electromagnetic wave shielding filter is disposed on the front surface of the display. The electromagnetic wave shielding filter used for such applications requires light transmittance as well as electromagnetic wave shielding performance. Therefore, a transparent conductive mesh using a transparent film such as a resin film or glass as a base material, and providing a mesh layer that achieves both conductivity and light transmission by etching a metal foil or metal plating on the transparent film. Filters are known. Since the mesh layer made of a metal layer itself is light opaque, the layer is formed in a pattern so that the shape in plan view is a mesh shape, and a large number of small holes (openings) are provided so that light transmission is achieved. Is secured. However, if the mesh is too large, it will get in the way of the display image, and if the total area (opening ratio) of the mesh holes is small, the display image will also be disturbed and dark. On the other hand, if the lines that make up the mesh are made too thin, the area resistance of the mesh increases and disconnection or the like occurs, impairing the original electromagnetic shielding performance.

  Also, if the surface of the mesh layer is light-reflective, unnecessary light such as outside light is reflected and the bright room contrast of the fluoroscopic image is lowered. Therefore, the surface of the mesh layer itself is usually blackened. It is also known to blacken in the blackening layer.

  By the way, most of the conductive patterns used in the electromagnetic wave shielding filter for PDP are manufactured by a photoetching method (Patent Document 1). According to the photoetching method, a high-definition conductive pattern can be formed. However, due to the etching process, the intersection portion of the conductive pattern becomes thick. That is, the industrially used etching method is “wet etching” which is an isotropic etching method. In this method, since it is dissolved and removed stepwise from the surface layer, it has a shape like Mt. Fuji in the vertical direction. Further, in the surface direction, a wide part is removed early, and conversely, a narrow part is removed relatively slowly. As a result, the etching rate of the corner portion that is the intersection of the lines is slow, and particularly when the angle of the intersection is 90 degrees or an angle exceeding 90 degrees (obtuse angle), the radius of curvature tends to increase. This is a phenomenon of thickening of the intersection part of the conductive pattern. If the intersection portion of the conductive pattern is thick, there is a problem that moire of the screen occurs due to this.

By the way, the present inventor purchased a commercially available PDP panel, and as a result of observing the conductive mesh pattern produced by the photoetching method attached to the front surface with an optical microscope, the intersection of the conductive pattern was thickened. The radius of curvature at the intersection was 45 μm.
JP-A-10-335884, (Examples)

  The present invention has been made in view of the above circumstances, and provides a method for producing a translucent conductive film capable of preventing the intersection portion of the conductive pattern from being thickened, and a novel translucent conductive film obtained by the method. The purpose is to do.

  The present invention has been made to achieve the above object, and has the following configuration.

(1) It has a transparent film and a network-like conductive pattern formed on this film, and this conductive pattern is 5% to 30% organic binder (A) and 70 to 95% by mass. The conductive powder including conductive powder (B) includes 50 to 95 parts by weight of spherical conductive powder with respect to 100 parts by weight of the total conductive powder. Is a gravure printing method, and has a radius of curvature of 40 μm or less at the intersection of patterns that intersect at an angle of 90 degrees or more.

(2) The translucent conductive film according to (1), wherein the conductive pattern is colored.

(3) A conductive pattern is formed on a transparent film by gravure printing, and the transparent conductive film according to (1) or (2) is manufactured. Method.

(Definition)
In the description of this specification and the claims,
The “transparent film” of the present invention is not limited to being colorless and transparent, but also includes a light color that has transparency.

  The “network” in the present invention is not limited to a geometric pattern, and may be a non-geometric pattern such as an indeterminate shape, and the form is not limited. The geometric pattern typically includes a lattice pattern formed by straight lines intersecting each other, but also includes patterns such as triangles, quadrilaterals, pentagons, hexagons or more, round shapes, leaf shapes, etc. .

  The “spherical” of the “spherical conductive powder” in the present invention refers to a powder having an aspect ratio in the range of 1.0 to 1.5.

  ADVANTAGE OF THE INVENTION According to this invention, the translucent conductive film which does not produce the moire of a screen without the thickness of the intersection part of an electroconductive pattern can be provided.

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

(Transparent film)
Examples of the material of the transparent film include resins such as polyester resin, acrylic resin, polycarbonate resin, polyethersulfone resin, polypropylene resin, triacetyl cellulose resin, cyclopentadiene resin, norbornene resin, and urethane resin. If necessary, the surface of the film may be provided with a hard coat layer, an easy-adhesion layer, a release treatment layer, a conductive polymer layer or the like, or may be subjected to a plasma treatment or the like. . The thickness of the transparent film is usually 20 μm to 10 mm.

Organic binder (A)
The organic binder resin (A) constituting the component of the conductive pattern according to the present invention remains in the coating film after drying and curing the conductive paste, and imparts various physical properties such as adhesion, flex resistance, and hardness. Or an important component necessary for imparting printability. The type of the organic binder resin (A) is not limited as long as it can impart printability to the paste. Examples include polyester resins, urethane-modified polyester resins, epoxy-modified polyester resins, various modified polyester resins such as acrylic-modified polyester, polyether urethane resins, polycarbonate urethane resins, acrylic urethane resins, vinyl chloride / vinyl acetate copolymers, epoxy Resin, phenol resin, acrylic resin, polyvinyl butyral resin, polyamideimide, polyimide, polyamide, nitrocellulose, modified celluloses such as cellulose acetate butyrate (CAB), cellulose acetate propionate (CAP), and the like.

  The exemplified organic binder resin (A) is polyester resin, acrylic resin, polyvinyl butyral resin, modified polyester resin, vinyl chloride / vinyl acetate copolymer, copolymer polyester resin, etc. in terms of flex resistance and film adhesion. However, a polyester resin, an acrylic resin, or a polyvinyl butyral resin having a reaction site with a cross-linking agent described later is more preferable.

  The organic binder resin (A) has a number average molecular weight (Mn) of 3000 to 50000, more preferably 5000 to 30000. If the number average molecular weight is less than 3000, transfer defects are likely to occur during printing, and it becomes difficult to form a good conductive pattern. On the other hand, if the number average molecular weight exceeds 50,000, whisker defects or line waviness due to stringing of the paste is likely to occur during printing, and printability is impaired. The number average molecular weight is a standard polystyrene equivalent value measured by gel permeation chromatography (GPC).

Conductive powder (B)
Any conductive powder (B) can be used as long as it imparts conductivity in the composition. Examples of such conductive powder include Ag, Au, Pt, Pd, Ni, Cu, Al, Sn, Pb, Zn, Fe, Ir, Os, Rh, W, Mo, Ru, and the like. Among these, Ag (silver powder) is preferable. These conductive powders are not limited to those used in a single form, but may be used in the form of alloys or oxides. Furthermore, tin oxide (SnO ₂ ), indium oxide (In ₂ O ₃ ), ITO (Indium Tin Oxide), or the like can also be used. As the conductive powder (B), various shapes such as a spherical shape, a flake shape, and a dentlite shape can be used. However, in consideration of printability and dispersibility, it is preferable to use a spherical powder as a main component. However, the contact between the conductive powders in the organic binder is insufficient with only the spherical shape, and it becomes difficult to exhibit the desired conductivity. It is preferable to do.

  The mixing ratio of the spherical conductive powder has a suitable range in order to achieve both printability and conductivity. The mixing ratio is 50 to 95% by mass of the spherical conductive powder, preferably 60 to 95% by mass of the spherical conductive powder with respect to the total blending amount of the conductive powder. If the ratio of the spherical conductive powder is less than 50% by mass, the thixotropy of the paste becomes too high and printability is impaired, which is not preferable. On the other hand, when the ratio of the spherical conductive powder exceeds 95%, the specific resistance value is lowered and the desired conductivity is not exhibited, which is not preferable.

  When using a spherical shape for the conductive powder (B), it is an average particle diameter of 10 random conductive powders observed at 10,000 times using an electron microscope (SEM), preferably 0.1 to 5 μm, preferably Is preferably 0.4 to 2.0 μm. When the average particle size is less than 0.1 μm, the contact between the conductive powders hardly occurs and the conductivity is lowered. On the other hand, when the average particle size exceeds 5 μm, the linearity of the line edge when printed is obtained. It is not preferable because it becomes difficult to be used. In addition, it is preferable to use the thing of the magnitude | size of 0.5-3.5 micrometers in the average particle diameter measured with the micro track | truck.

  Moreover, when using flaky shape for electroconductive powder (B), it is an average particle diameter of 10 random electroconductive powders observed at 10,000 times using an electron microscope (SEM), and 0.1 to It is preferable to use one having a size of 10 μm, preferably 0.4 to 5.0 μm. When the average particle size is less than 0.1 μm, contact between the conductive powders hardly occurs and the conductivity is lowered. On the other hand, when the average particle size exceeds 10 μm, the thixotropy of the paste is increased and the printability is deteriorated. For this reason, it is not preferable because it is difficult to obtain the linearity of the print pattern. In addition, it is preferable to use the thing of the magnitude | size of 0.5-7.0 micrometers in the average particle diameter measured with the micro track | truck.

As the conductive powder (B), a silver powder is preferable. In this case, the silver powder (B) has a specific surface area of 0.01 to 2.0 m ² / g, preferably 0.1 to 1.0 m ² / g. It is preferable to use one. When this specific surface area is less than 0.01 m ² / g, sedimentation is likely to occur during storage. On the other hand, when the specific surface area exceeds 2.0 m ² / g, the oil absorption increases and the fluidity of the paste is impaired. It is not preferable.

(Coloring agent)
When coloring an electroconductive pattern, it is preferable to mix | blend a coloring agent with the electroconductive paste which forms a pattern. There is no restriction | limiting in particular in the kind and shape as a coloring agent, A well-known and usual thing can be used. Any colorant can be used as long as it is a color suitable for display applications, preferably blue, black, black by three colors, etc., more preferably black. From the viewpoint of availability, carbon black for coloring materials is suitable. Examples of the carbon black include carbon blacks for color materials such as channel black, furnace black and lamp black, and conductive carbon black and acetylene black. Among these, fine powder having an average particle size of 30 nm or less is preferable. . In addition, inorganic pigments such as titanium black, iron tetroxide (iron black), and cobalt tetroxide are also included. Moreover, when using dye, dye soluble in organic solvents, such as solvent black and oil black, can be applied.

  Among the colorants, a black colorant such as carbon black is used for the purpose of improving the visibility of the display by coloring the conductive paste black. The blending amount of carbon black may be any blending amount as long as it can be colored to the intended brightness (defining the blackness), but 5 to 100 parts by weight, preferably 100 parts by weight with respect to 100 parts by weight of the organic binder resin. 10-80 mass parts is preferable.

  When the amount of the black colorant such as carbon black is less than 5 parts by mass, the lightness of the paste increases and the visibility of the display deteriorates, which is not preferable. On the other hand, blending in a large amount exceeding 100 parts by mass is not preferable because problems such as a marked increase in viscosity and too high thixotropy occur.

The lightness can be quantified by the lightness L ^* value of the L ^* a ^* b ^* color system defined in JIS Z8729, and the L ^* measured with a color difference meter after printing and drying the paste ^. It is also possible to appropriately select the blending amount of the black colorant such as carbon black within the range of 5 to 100 parts by mass so that the value is 5 to 40, preferably 10 to 30.

  The conductive pattern is formed by drying and curing a conductive paste as described above. This conductive paste contains the following components together with an organic binder and conductive powder.

(Organic solvent contained in conductive paste)
Any known organic solvent can be used as long as it can dissolve the organic binder. For example, toluene, xylene, ethyl acetate, butyl acetate, methanol, ethanol, isopropyl alcohol, isobutyl alcohol, 1-butanol, diacetone alcohol, ethylene glycol monobutyl ether, propylene glycol monoethyl ether, propylene glycol monomethyl ether acetate, terpineol, methyl ethyl ketone , Carbitol, carbitol acetate, butyl carbitol, butyl carbitol acetate, and the like, and two or more of them may be included as necessary. In the case where the conductive paste is printed by gravure printing, it is desirable that the solvent in the ink is relatively volatile.

  The addition amount of the organic solvent can be appropriately selected depending on the method so that the conductive paste has an appropriate viscosity for printing by the gravure printing method.

(Crosslinking agent contained in conductive paste)
It is preferable to mix and use a crosslinking agent in the conductive paste of the present invention. The type of the curing agent that can react with the organic binder resin is not particularly limited, but an isocyanate compound having two or more isocyanate groups in one molecule is particularly preferred from the viewpoint of adhesion, flex resistance, curability, solvent resistance, and the like. These isocyanate compounds may be used in the form of a block in order to ensure storage stability.

  Examples of the isocyanate compound include aromatic and aliphatic diisocyanates and trivalent or higher polyisocyanates, which may be either low molecular compounds or high molecular compounds. For example, tetramethylene diisocyanate, hexamethylene diisocyanate, toluene diisocyanate, diphenylmethane diisocyanate, hydrogenated diphenylmethane diisocyanate, xylylene diisocyanate, hydrogenated xylylene diisocyanate, isophorone diisocyanate or trimers of these isocyanate compounds, and excess of these isocyanate compounds Amount of low molecular active hydrogen compounds such as ethylene glycol, propylene glycol, trimethylolpropane, glycerin, sorbitol, ethylenediamine, monoethanolamine, diethanolamine, triethanolamine or various polyester polyols, polyether polyols, polyamides Obtained by reacting with polymer active hydrogen compounds Terminal isocyanate group-containing compounds to be.

  Examples of the blocking agent for isocyanate groups include phenols such as phenol, thiophenol, methylthiophenol, ethylthiophenol, cresol, xylenol, resorcinol, nitrophenol, chlorophenol, oximes such as acetoxime, methyl ethyl ketoxime, and cyclohexanone oxime, Alcohols such as methanol, ethanol, propanol and butanol; halogen-substituted alcohols such as ethylene chlorohydrin and 1,3-dichloro-2-propanol; tertiary alcohols such as t-butanol and t-pentanol; -Lactams such as caprolactam, δ-valerolactam, γ-butyrolactam, β-propylolactam and the like, and other aromatic amines, imides, acetylacetates Emissions, acetoacetic ester, active methylene compounds such as malonic acid ethyl ester, mercaptans, imines, imidazoles, ureas, diaryl compounds, sodium bisulfite, etc. can be mentioned. Of these, oximes, imidazoles, and amines are particularly preferable from the viewpoint of curability.

  These crosslinking agents may be used in combination with known catalysts or accelerators selected according to the type.

  What is necessary is just to select suitably the addition amount of a crosslinking agent so that it may become 0.1-2.0 mol equivalent per 1 mol equivalent of functional groups (a hydroxyl group, a carboxyl group, etc.) in an organic binder. On the other hand, 1-100 mass parts, More preferably, 5-50 mass parts is suitable.

  The action of the cross-linking agent is to form a three-dimensional network chain structure by reacting with a functional group in the organic binder resin to form a film having excellent solvent resistance and adhesion. By forming a three-dimensional network structure, it becomes effective in maintaining the shape and appearance of the formed conductive pattern in the subsequent application of adhesive, color conversion layer, and antireflection film, etc. The quality can be kept good.

(Auxiliary agent contained in conductive paste)
In the conductive paste of the present invention, a metal dispersant, a thixotropy imparting agent, an antifoaming agent, a leveling agent, a diluent, a plasticizer, an antioxidant, and a metal deactivator as long as printability is not impaired. You may mix | blend additives, such as an agent, a coupling agent, and a filler.

(Compounding ratio of conductive paste)
When the colorant (C) and the crosslinking agent (E) are blended together with the organic binder resin (A) and the conductive powder (B), the organic binder resin (A ), The conductive powder (B), the colorant (C), and the cross-linking agent (E) in a total mass ratio of [(B) + (C)] / [(A) + (E)] = It is preferable that it is in a range satisfying 7/1 to 14/1, more preferably 10/1 to 15/1. When [(B) + (C)] / [(A) + (E)] is less than 7/1, the amount of the conductive powder in the dry coating film is reduced and the conductivity is deteriorated, which is not preferable. On the other hand, when the ratio exceeds 17/1, the ratio of the organic binder resin in the conductive paste is too small, so that the printability is deteriorated and a failure such as a transfer failure is likely to occur during gravure printing.

(Viscosity of conductive paste)
The conductive paste has a viscosity range of 50 to 1000 dPa · s, preferably 100 to 500 dPa · s. This value is a value measured at 25 ° C. using a cone plate viscometer.

(Conductive pattern form)
Printing of the conductive pattern is usually performed so that the pattern has a mesh shape, typically a lattice shape. The line width of this pattern is usually 10 to 80 μm, preferably 10 to 40 μm, and the line spacing of this pattern is usually 100 to 500 μm, preferably 125 to 500 μm. When the line width and the line interval are too large, the conductive pattern of the obtained translucent conductive film is easily noticeable, and when used as a display front plate, the visibility of the screen tends to be lowered. Also, if the line spacing is too small, the conductive pattern of the resulting electromagnetic shielding material becomes finer (the number of lines per unit area increases), the visible light transmittance decreases, and when used as a display front plate In addition, the screen tends to be dark. In addition, since it tends to be difficult to form a uniform pattern as the line width is smaller, it is appropriately 10 μm or more as described above.

  As illustrated in FIG. 1, the intersection of the conductive patterns has a radius of curvature of 90 degrees (right angle) or more than 90 degrees (obtuse angle part) of 40 μm or less, particularly preferably 30 μm or less. As a result, a conductive pattern free from color unevenness and moire can be obtained. In view of manufacturing efficiency, workability, etc., the radius of curvature is preferably 5 μm or more.

  By increasing the amount of spherical conductive powder in the conductive powder of the conductive paste and reducing the particle size of the spherical conductive powder, the radius of curvature of the perpendicular or obtuse angle portion of the intersection of the conductive patterns is reduced. be able to. Further, by using the gravure printing method, compared with other printing methods, the printing quality and productivity are excellent, and the radius of curvature can be 40 μm or less. The reason for this is that, in the gravure printing method, since the transfer process from the intaglio to the film is one time, it is easy to accurately trace the pattern of the plate and it is easy to form a sharp image line. On the other hand, in other printing methods, for example, gravure offset printing method, two transfer steps from the intaglio to the blanket and from the blanket to the film are performed. Since printing pressure is applied during transfer, the pattern tends to be crushed or deformed by compressive stress. For this reason, it is difficult to make the curvature radius 40 μm or less.

(Printing method of conductive paste)
A gravure printing method is used as a method for pattern printing ink (conductive paste) in a mesh pattern. The intaglio used for gravure printing can be produced by making a plate using a technique such as photolithography or laser on the surface of a cylinder or flat plate made of copper, 42 alloy, glass or the like. Furthermore, the durability of the intaglio may be improved by performing a chrome plating process or a DLC (diamond-like carbon) process as necessary.

  If the ink printed in a pattern contains a solvent, it can be removed by evaporating the solvent by heat treatment or far-infrared treatment, and the binder resin component contained in the ink can be polymerized or curable. For example, a pattern of a resin composition containing conductive powder is formed by performing polymerization / curing treatment.

  The conductive paste of the present invention is colored in advance (for example, colored black), so that a blackening treatment is not required, and a light-transmitting conductive film excellent in conductivity can be obtained only by printing and drying (or curing). The film can be suitably used for applications such as electromagnetic wave shielding.

  The light-transmitting conductive film for display thus formed may be subjected to post-treatment such as antireflection treatment, coloring treatment for color correction, and near infrared absorption treatment as necessary. Moreover, it is preferable that the adhesive for affixing on a display is apply | coated.

  EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples and comparative examples, but the present invention is not limited to the following examples.

(Preparation of transparent film)
As the transparent film, a 125 μm polyethylene terephthalate (PET) film on which an easy adhesion layer was formed (AC-L, manufactured by Panac Co., Ltd.) was used.

(Preparation of silver paste composition 1)
100 parts by mass of polyvinyl butyral resin (Sekisui Chemical Co., Ltd., ESREC BL-S, Mn = 19000), 975 parts by mass of spherical silver powder (average particle size = 1.6 μm), 325 parts by mass of flaky silver powder (average particle size = 5 μm) Parts, carbon black (Mitsubishi Chemical Carbon MA-100, furnace black with a particle size of 24 nm) 30 parts, and organic solvent (carbitol acetate) 200 parts by weight are mixed and kneaded in a three-roll mill, and spherical The ratio of silver powder and flaky silver powder was part by mass, and a 75/25 silver paste composition was obtained.

(Preparation of silver paste composition 2)
100 parts by weight of polyvinyl butyral resin (Sekisui Chemical Co., Ltd. S-REC BL-S, Mn = 19000), 1170 parts by weight of spherical silver powder (average particle size = 1.6 μm), 130 parts by weight of flaky silver powder (average particle size = 5 μm) Parts, carbon black (Mitsubishi Chemical Carbon MA-100, furnace black with a particle size of 24 nm) 30 parts, and organic solvent (carbitol acetate) 200 parts by weight are mixed and kneaded in a three-roll mill, and spherical The ratio of silver powder and flaky silver powder was part by mass, and a 90/10 silver paste composition was obtained.

Example 1
The silver paste composition 1 produced above is formed into a lattice pattern in which the plate depth = 10 μm, line width = 20 μm, pitch = 300 μm, bias angle (angle formed by lines with respect to the printing direction) = 45 °, and the lines are orthogonal. The chrome-plated intaglio plate was used to print on the easily adhesive surface of the film by gravure printing and dried at 130 ° C. for 30 minutes. When the intersection of the lines of the translucent conductive film thus obtained was observed with an optical microscope and the radius of curvature (R) of the intersection was calculated, R = 20 μm and the straight line straightness was excellent. It was.

  When this translucent conductive film was affixed to the PDP and the state of the screen was visually observed, no color unevenness or moire was observed.

(Example 2)
When the silver paste composition 2 prepared above was printed under the same conditions as in Example 1, the curvature radius R of the intersection was R = 15 μm and the straight line straightness was excellent.

  When this translucent conductive film was affixed to the PDP and the state of the screen was visually observed, no color unevenness or moire was observed.

(Comparative Example 1: Gravure offset printing method)
A chrome-plated intaglio plate in which a grid pattern is formed on the silver paste composition 1 produced above with a plate depth = 10 μm, line width = 20 μm, pitch = 300 μm, and bias angle (angle formed by lines with respect to the printing direction) = 45 °. Was printed on the easily adhesive surface of the transparent film by gravure offset printing and dried at 130 ° C. for 30 minutes. Note that silicone rubber having a hardness of 40 ° was used for the blanket. When the intersecting part of the line of the translucent conductive film thus obtained was observed with an optical microscope and the radius of curvature (R) of the intersection was calculated, the intersection was thickened at R = 45 μm, and the line went straight. The nature was also bad.

When this translucent conductive film was affixed to the PDP and the state of the screen was visually observed, color unevenness was observed throughout, and moire was partially observed.

(Comparative example 2: Photo etching method)
A transparent PET film with a thickness of 125 μm is used as the plastic film, and an epoxy adhesive sheet (Nikaflex SAF; manufactured by Nikkan Kogyo Co., Ltd., thickness 20 μm) serving as an adhesive layer thereon is used to form a conductive material with a thickness of 18 μm. The electrolytic copper foil was laminated by heat lamination under conditions of 180 ° C. and 30 kgf / cm ² so that the roughened surface was on the epoxy adhesive sheet side. A copper lattice pattern having a line width of 20 μm and a line interval of 300 μm is formed on the PET film through a photolithography process (resist film application-exposure-development-chemical etching-resist film peeling) on the obtained PET film with copper foil. A photoconductive film was obtained. The intersection of the lines of the translucent conductive film thus obtained was observed with an optical microscope, and the radius of curvature (R) of the intersection was calculated. As a result, R = 45 μm.

  When this translucent conductive film was affixed to the PDP and the state of the screen was visually observed, color unevenness was observed throughout, and moire was partially observed.

Explanatory drawing which shows the shape of the various intersections of a conductive pattern, and the curvature radius in an intersection.

Claims (3)

It has a transparent film and a network-like conductive pattern formed on this film, and this conductive pattern is 5% to 30% of organic binder (A) and 70 to 95% of conductive powder by mass%. (B), and the conductive powder included in the conductive pattern includes 50 to 95 parts by mass of spherical conductive powder with respect to 100 parts by mass of the total conductive powder, and the conductive pattern is gravure. A translucent conductive film formed by a printing method and having a curvature radius of 40 μm or less at an intersection of patterns that intersect at an angle of 90 degrees or more. The translucent conductive film according to claim 1, wherein the conductive pattern is colored. The manufacturing method of the translucent conductive film characterized by forming a conductive pattern on a transparent film by the gravure printing method, and manufacturing the translucent conductive film of Claim 1 or 2 .

Images