JP5428498B2 - Electrode film for touch panel and touch panel - Google Patents

Description

  The present invention relates to an electrode film for a touch panel and a touch panel.

  The touch panel is used as an input device mounted on a screen of a display device such as a liquid crystal display or a plasma display. Capacitance type, optical type, ultrasonic type, thin film resistance type, etc. have been proposed as the touch panel type depending on the input position detection method, but especially the thin film resistance type touch panel has a simple structure and detection method. It is widely used because it is. A general thin film resistance type touch panel uses two electrode films having a transparent conductive film such as ITO on the surface, and the electrode films face each other so that the transparent electrode film faces each other, and are spaced apart by a spacer or the like. It is configured as follows.

  Such a conventional thin film resistance type touch panel has a problem of increasing light transmittance. In response to this problem, Patent Document 1 below proposes an electrode film in which a missing portion is provided in a transparent conductive film formed on an electrode film, and the light transmittance is improved by the presence of the missing portion.

  Further, a transparent conductive film such as ITO is formed on a conventional thin film resistance type touch panel, but this transparent conductive film is brittle and has a problem that it is cracked or peeled off due to bending or the like. . In order to solve this problem, Patent Document 2 below proposes an electrode film that does not use a transparent conductive film. Specifically, there has been proposed an electrode film in which a lattice network-like opening pattern is formed with a resist film, and a lattice network-like metal film is formed on the opening pattern by electroless plating. Moreover, in the following patent document 3, when a stress relaxation layer is provided between the base material of the electrode film and the transparent conductive film, for example, sliding stress at the time of pen input can be absorbed and peeling of the transparent conductive film can be prevented. An electrode film has been proposed.

Japanese Patent Laid-Open No. 10-326152 JP 2004-192093 A JP 2007-18869 A WO2008-149969 pamphlet

  By the way, the present inventors have already proposed an electromagnetic wave shielding material in which a conductive mesh is formed on a transparent film by a printing method (see Patent Document 4). When the present inventors applied this technique to an electrode film of a touch panel, it was found that the improvement was necessary due to a problem specific to the touch panel. That is, when the electrode film which formed the conductive mesh by the printing method was used as an electrode film for touch panels, it turned out that the conductive mesh is easy to destroy by sliding, such as an input pen.

  The present invention has been made in order to solve the above-mentioned problems, and its purpose is to destroy the conductive mesh even when the electrode film formed with the conductive mesh by the printing method is used as an electrode film for a touch panel. It is providing the electrode film for touch panels which does not produce. Another object of the present invention is to provide a touch panel using such an electrode film for a touch panel.

  An electrode film for a touch panel according to the present invention for solving the above problems is provided with a transparent substrate, a primer layer provided on one surface of the transparent substrate, and a predetermined pattern on the primer layer. It has the electroconductive mesh which consists of an electroconductive composition, and the hard-coat layer provided in the other surface of the said transparent base material, It is characterized by the above-mentioned.

  According to this invention, the touch pen sliding durability test is performed by forming the hard coat layer on the surface of the transparent base material on which the conductive mesh is not formed, that is, the surface on the side where the input pen or the like comes into contact. It has been found that the breakage of the conductive mesh when done is significantly reduced and good results are obtained. The reason for this is not clear, but perhaps by providing a hard coat layer, local pressing of the electrode film by the pen tip of the touch pen was suppressed and local deformation was reduced. It is inferred that the slipperiness of the nib is improved and the concentration of addition on the conductive mesh is dispersed.

  In a preferred embodiment of the electrode film for a touch panel according to the present invention, the hard coat layer has a pencil hardness of 2H to 4H.

  According to this invention, a preferable result can be obtained when the pencil hardness of the hard coat layer is 2H to 4H.

  In a preferred embodiment of the electrode film for a touch panel according to the present invention, the conductive composition is a binder component selected from a thermoplastic resin, an ionizing radiation curable resin, and a thermosetting resin, metal fine particles, conductive fine particles, and conductive. And at least one conductive component selected from organic compounds, and the conductive mesh is provided by printing the conductive composition.

  According to this invention, since the conductive mesh is formed by printing the conductive composition having the binder component and the conductive component, the resistance value of the conductive mesh can be easily adjusted by adjusting the composition of the conductive component. The durability of the conductive mesh can be controlled by adjusting the binder component. As a result, the conductive mesh is not destroyed, and a conductive mesh having a desired resistance value can be provided.

  The preferable aspect of the electrode film for touchscreens which concerns on this invention is comprised so that the metal layer may be further formed in the surface of the said electroconductive mesh.

  According to this invention, the metal layer can be further formed on the surface of the conductive mesh, and the resistance value of the conductive mesh can be adjusted to a desired value.

  The touch panel according to the present invention for solving the above problems is a touch panel in which the electrode surfaces of two electrode films are opposed to each other at a constant interval, and at least the electrode film on the input side has a conductive mesh as an electrode. A conductive mesh comprising a transparent substrate, a primer layer provided on one surface of the transparent substrate, and a conductive composition provided in a predetermined pattern on the primer layer. And a hard coat layer provided on the other surface of the transparent substrate.

  According to this invention, when the touch pen sliding durability test is performed, the breakage of the conductive mesh is remarkably reduced, and good results can be obtained.

  In a preferred embodiment of the touch panel according to the present invention, the hard coat layer has a pencil hardness of 2H to 4H.

  According to the electrode film for a touch panel according to the present invention, by forming a hard coat layer on the surface on the side where the conductive mesh is not formed among the both surfaces of the transparent substrate, that is, the surface on the side where the input pen or the like contacts, It was found that when the touch pen sliding durability test was performed, the breakage of the conductive mesh was remarkably reduced and good results were obtained.

It is a schematic cross section which shows an example of the electrode film for touchscreens which concerns on this invention. It is a schematic cross section which shows another example of the electrode film for touchscreens which concerns on this invention. It is a schematic cross section which shows another example of the electrode film for touchscreens which concerns on this invention. It is a typical schematic top view of the electrode film for touchscreens which concerns on this invention. It is the model perspective view which expanded the electrically conductive mesh. It is a model perspective view which shows the example which provided the metal layer on the electroconductive mesh. It is a schematic cross section which shows the touch panel which has arrange | positioned the electrode film for touchscreens shown in FIG. 1 as an electrode film of both the input side and a display apparatus side. It is a schematic cross section which shows the touchscreen which has arrange | positioned the electrode film for touchscreens shown in FIG. 1 as an electrode film of an input side. It is process drawing which shows an example of the manufacturing method of the electrode film for touchscreens which concerns on this invention. It is a schematic plan view which shows an example of the electrode film used for a multi-touch type touch panel.

  Next, embodiments of the present invention will be described in detail, but the present invention is not limited to the following embodiments, and various modifications can be made within the scope of the gist of the present invention.

  An electrode film 10 for a touch panel according to the present invention (hereinafter simply referred to as “electrode film 10”) is provided on a transparent substrate 1 and one surface S1 of the transparent substrate 1, as shown in FIGS. Provided primer layer 2, conductive mesh 3 made of a conductive composition provided in a predetermined pattern on primer layer 2, and hard coat layer 4 provided on the other surface S2 of transparent substrate 1. doing.

  1 to 3, in the electrode film 10 </ b> A shown in FIG. 1, the primer layer 2 and the conductive mesh 3 are provided in this order on one surface S <b> 1 of the transparent substrate 1, and the other of the transparent substrate 1. In this embodiment, the hard coat layer 4 is provided on the surface S2. In the electrode film 10B shown in FIG. 2, the primer layer 2 and the conductive mesh 3 are provided in this order on one surface S1 of the transparent substrate 1, and the easy adhesion layer 5 is provided on the other surface S2 of the transparent substrate 1. The hard coat layer 4 and the AR layer (antireflection layer) 6 are provided in that order. In the electrode film 10C shown in FIG. 3, the primer layer 2 and the conductive mesh 3 are provided in this order on one surface S1 of the transparent substrate 1, and the filling layer 9 is provided in the opening 19 between the conductive meshes. In this embodiment, the easy adhesion layer 5, the hard coat layer 4, and the AR layer (antireflection layer) 6 are provided in this order on the other surface S <b> 2 of the substrate 1.

  Further, as shown in FIG. 4, the planar form of the electrode film 10 includes a conductive mesh pattern portion 7 positioned at the center and facing the display surface of the display device, and a conductive mesh around the conductive mesh pattern portion 7. However, it is not necessarily limited to the form shown in the drawing. 5 is a perspective view when the conductive mesh 3 formed with the line width W and the line pitch P is enlarged. FIG. 6 is a perspective view showing an electrode film 10 </ b> D in which a metal layer 11 is further provided on the conductive mesh 3.

  As shown in FIGS. 7 and 8, touch panels 50A and 50B according to the present invention are touch panels in which the electrode surfaces of two electrode films (10 and 20 or 10 and 30) are opposed to each other at a constant interval G. And the electrode film 10 of the input side which the input pen 40 etc. contacts at least is the electrode film which concerns on this invention which has the electroconductive mesh 3 as an electrode. The electrode film on the display device side may be the electrode film 20 according to the present invention, or a conventional electrode film, that is, an electrode film in which a transparent conductive film 23 such as ITO is formed on the transparent substrate 21. It may be 30.

  FIG. 10 shows an electrode film 70 constituting a touch panel for multi-touch. As shown in FIG. 10, the multi-touch electrode film 70 is provided on a transparent substrate as a conductive mesh 71 divided into a plurality of regions. Reference numeral 72 denotes a wiring from each conductive mesh 71. Although not shown, the wiring also protrudes from the right side of the conductive mesh 71. When a touch panel is configured with such multi-touch electrode film 70, two conductive meshes 71 that are long on the left and right in FIG. 10 are used, and the other electrode film 70 has the longitudinal direction of conductive mesh 71 up and down, It is desirable to arrange the conductive meshes 71 of the two electrode films 70 so that the longitudinal directions thereof are orthogonal. The electrode film 70 of the present invention has an advantage that the conductive mesh 71 can be formed by transfer means, and therefore can easily cope with such a conductive mesh pattern.

  Hereinafter, each configuration will be described in detail.

(Transparent substrate)
The transparent substrate 1 is a substrate of the electrode film 10 and has various thicknesses of various materials preferable for a touch panel in consideration of required transparency such as desired transparency, mechanical strength, and adhesion with the primer layer 2. You can select one. The material of the transparent substrate 1 may be a resin substrate or an inorganic substrate such as a glass substrate, but when used as the electrode film 10 on the input side, the opposing electrode film It is necessary that the conductor (the reference numerals 20 and 30 in FIGS. 7 and 8) be flexible enough to be in contact with the conductor. On the other hand, when used as the electrode films 20 and 30 (see FIGS. 7 and 8) on the display device side, such flexibility may or may not be provided. Moreover, as a thickness form, although it may be a film or a sheet, it is necessary to have a thickness that can be used as an electrode film for a touch panel. In the case of the electrode film 10 on the input side, A resin base material is preferably used. On the other hand, the electrode films 20 and 30 on the display device side are not particularly limited, and may be a resin base material or an inorganic base material.

  The transparent substrate 1 is preferably a film based on an acrylic resin (used here as a concept including a methacrylic resin), a polyester resin, or the like, but is not limited thereto. Specific examples of the resin material include cellulose resins such as triacetyl cellulose, diacetyl cellulose, and acetate butyrate cellulose, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), ethylene glycol-terephthalic acid-isophthalic acid copolymer Polymers, polyester resins such as terephthalic acid-ethylene glycol-1,4 cyclohexanedimethanol copolymer, polyester thermoplastic elastomer, polyolefin resins such as polyethylene, polypropylene, polymethylpentene, cyclic polyolefin, polyvinyl chloride, polyvinylidene chloride Halogen-containing resins such as polyether sulfone resin, polyacrylic resin, polyurethane resin, polycarbonate resin, styrene resin such as polystyrene, polyamide Fat, polyimide resins, polysulfone resins, polyether resins, polyether ketone, (meth) acrylonitrile and the like can be used. Among them, the biaxially stretched PET film is preferable in that it has excellent transparency and durability, and has heat resistance that does not cause thermal deformation even when subjected to ultraviolet irradiation treatment or heat treatment in the subsequent steps.

  On the other hand, inorganic materials constituting the inorganic base material include soda glass, potash glass, lead glass, borosilicate glass, quartz glass, phosphate glass, etc., crystalline quartz (quartz), calcite (calcium carbonate), diamond ( And transparent inorganic crystals such as gold goethite, and transparent ceramics such as PLZT.

  The transparent substrate 1 may be a continuous long belt-like film that can be processed by rolls, tows, or rolls, or may be a sheet film having a predetermined size. Here, the term “roll toe roll” means that a long belt-like base material is supplied in the form of a roll (roll), and the belt-like sheet is unwound from the roll to perform a predetermined process, and thereafter It means a form of use of the film that is wound up, stored and transported again in the form of winding.

  Although the thickness of the transparent base material 1 varies depending on the material, in the case of, for example, a PET base material that is preferably used as the electrode film 10 on the input side, it is usually preferably about 100 μm to 188 μm. On the other hand, in the case of a resin base material or an inorganic base material (glass base material) used as the electrode films 20 and 30 on the display device side, it is not particularly limited, but is usually about 50 μm to 500 μm.

  As the light transmittance of the transparent substrate 1, since the touch panels 50A and 50B are installed on the front surface of the display device, 100% is ideal, but one having a transmittance of 80% or more should be selected. Is preferred. If necessary, an easy-adhesion layer (not shown) is provided on the surface of the transparent substrate 1 in order to improve the adhesion between the primer layer 2 and the transparent substrate 1 described later, or corona discharge treatment or plasma treatment. Further, surface treatment such as flame treatment may be performed. As an easily bonding layer, it comprises from resin which has adhesiveness in both the transparent base material 1 and the primer layer 2. FIG. The resin for the easy adhesion layer is appropriately selected from resins such as urethane resin, epoxy resin, polyester resin, acrylic resin, and chlorinated polypropylene.

(Primer layer)
The primer layer 2 is provided on the transparent substrate 1 with good adhesion. A conductive mesh 3 is provided on the primer layer 2 with good adhesion. Therefore, the primer layer 2 is preferably a material having good adhesion to both the transparent substrate 1 and the conductive mesh 3, and is a constituent layer of the touch panels 50A and 50B provided on the front surface of the display device. Of course, it is preferably transparent. For example, a layer formed by applying an ionizing radiation curable resin or a thermoplastic resin is preferable. Various additives and modified resins may be used to improve adhesion, durability, and impart various physical properties.

  Examples of the thermoplastic resin include acrylic resins such as polymethyl methacrylate (PMMA), vinyl chloride-vinyl acetate copolymers, polyester resins, and polyolefin resins.

  As the ionizing radiation curable resin, a monomer (monomer) that is polymerized and cured by a reaction such as crosslinking with ionizing radiation, or a prepolymer or an oligomer is used. As the monomer, for example, a radical polymerizable monomer, specifically, 2-ethylhexyl (meth) acrylate, diethylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, trimethylolpropane tri (meth) Examples thereof include various (meth) acrylates such as acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, and dipentaerythritol hexa (meth) acrylate. Examples of the prepolymer (or oligomer) include radically polymerizable prepolymers, specifically, urethane (meth) acrylate, epoxy (meth) acrylate, polyester (meth) acrylate, triazine (meth) acrylate, and the like. (Meth) acrylate prepolymers, polythiol prepolymers such as trimethylolpropane trithioglycolate, pentaerythritol tetrathioglycolate, and unsaturated polyester prepolymers. Other examples include cationically polymerizable prepolymers such as novolac epoxy resin prepolymers and aromatic vinyl ether resin prepolymers. Here, the notation (meth) acrylate means acrylate or methacrylate.

  These monomers or prepolymers may be used alone or in combination of two or more types of monomers, two or more types of prepolymers, or one type of monomer, depending on the required performance, coating suitability, etc. A mixture of the above and one or more prepolymers can be used.

  As the photopolymerization initiator, in the case of a radically polymerizable monomer or prepolymer, a benzophenone-based, acetophenone-based, thioxanthone-based, benzoin-based compound, etc., or in the case of a cationic polymerization-based monomer or prepolymer, , Metallocene-based, aromatic sulfonium-based and aromatic iodonium-based compounds are used. These photopolymerization initiators are added in an amount of about 0.1 to 5 parts by weight with respect to 100 parts by weight of the composition comprising the monomer and / or prepolymer.

  The ionizing radiation is typically ultraviolet rays or electron beams, but other than these, electromagnetic waves such as visible rays, X-rays and γ rays, or charged particle beams such as α rays can also be used.

  Additives are added as necessary. Examples of the additive include a heat stabilizer, a radical scavenger, a plasticizer, a surfactant, an antistatic agent, an antioxidant, an ultraviolet absorber, an infrared absorber, a dye (colored dye, colored pigment), and an extender pigment. And a light diffusing agent.

Although the thickness of the primer layer 2 is not particularly limited, it is usually formed to have a thickness after curing of about 1 μm to 100 μm. Further, the thickness of the primer layer 2 is usually about 1 to 50% of the total value of the thickness of the conductive mesh 3 and the thickness of the primer layer 2. As will be described later in the explanation of the production method, the primer after the conductive composition 3 ′ is transferred onto the primer layer 2 and the conductive composition 3 ′ is further cured to produce the electrode film 10. layer 2 has a thickness T _a of the portion where the conductive mesh 3 is formed, has become thicker than the thickness T _B of the portion where the conductive mesh 3 is not formed.

(Conductive mesh)
The conductive mesh 3 is provided in a predetermined mesh (mesh pattern or lattice pattern) pattern on the primer layer 2. The conductive composition forming the conductive mesh 3 is not particularly limited as long as it is finally a conductive layer after various steps. As shown in FIG. 5, for example, the conductive mesh pattern can have a line width W of 5 to 200 μm and a line pitch P of 100 to 1000 μm. The aperture ratio (ratio of the total area of the openings 19 in the total area of the conductive mesh pattern) is usually about 50 to 95%.

In addition, the thickness T _C of the conductive mesh 3 (see FIG. 9D) and the resistance value of the conductive mesh 3 vary depending on the measurement at the central portion (top portion of the projection pattern), but usually 2 μm or more and 50 μm. Or less, preferably 5 μm or more and 20 μm or less.

  As shown in FIG. 9, the conductive mesh 3 is formed by filling the concave portion 62 provided on the plate surface 61 of the printing plate 60 with the conductive composition 3 ′ and transferring it onto the primer layer 2. Such a conductive composition 3 ′ is fluid when it fills the recess 62 of the plate 60, and exhibits desired conductivity after being formed into a desired pattern and cured. There is no particular limitation, and various materials and forms can be used. A typical example includes a fluid ink or paste-like material containing a conductive powder and a binder resin, and further containing a solvent or a dispersant for dissolving or dispersing the resin as necessary. . The conductive mesh 3 made of the conductive composition 3 ′ is a coating film made of a solid after the conductive composition 3 ′ is dried or cured. The reason why the composition is dissolved or dispersed is that the conductive composition 3 ′ includes a colloidal form as well as a solution form.

  For example, as described later, the viscosity of the conductive composition 3 ′ is such that the primer component in the primer layer 2 penetrates into the conductive composition 3 ′ to increase the viscosity, or the primer layer 2 and the conductive composition 3 ′. However, the range of usable viscosity is usually within the range of 100 mPa · s to 1000000 mPa · s. Yes, preferably in the range of several thousand mPa · s to tens of thousands mPa · s.

  Any of a thermosetting resin, an ionizing radiation curable resin, and a thermoplastic resin can be used as the binder resin constituting the conductive composition 3 ′. Examples of the thermosetting resin include resins such as melamine resin, polyester-melamine resin, epoxy-melamine resin, polyimide resin, thermosetting acrylic resin, thermosetting polyurethane resin, phenol resin, and thermosetting polyester resin. Examples of the ionizing radiation curable resin include those described above as the material for the primer layer. Examples of the thermoplastic resin include resins such as a polyester resin, a polyvinyl butyral resin, an acrylic resin, and a thermoplastic polyurethane resin. Can be mentioned. These resins may be used alone, or a plurality of resins may be mixed and used. In addition, when using a thermosetting resin, you may add a curing catalyst as needed. When using an ionizing radiation curable resin such as a photocurable resin, a polymerization initiator may be added as necessary.

  Further, in order to obtain fluidity suitable for filling the concave portion 62 of the plate 60, these resins are usually used as a varnish dissolved in a solvent. There is no restriction | limiting in particular in the kind of solvent, The solvent generally used for printing ink can be used. For example, acetone, methyl ethyl ketone, methyl isobutyl ketone, ketones such as cyclohexanone, cyclopentanone, ethers such as methyl ether and ethyl ether, ethyl acetate, methyl butyl butyrate, acetic acid diethylene glycol-n-butyl ether, ethylene glycol monobutyl ether acetate Esters such as, aliphatic hydrocarbons such as pentane, hexane and octane, aromatic hydrocarbons such as benzene, toluene and xylene, alcohols such as methyl alcohol, ethyl alcohol, propyl alcohol, isopropyl alcohol, butyl alcohol and terpineol 1 type or 2 types or more suitably selected from the class, water, etc. are used. The content of the solvent is usually about 10% by weight to 70% by weight, but is preferably as small as possible within a range where necessary fluidity can be obtained. In addition, when an ionizing radiation curable resin such as a photo-curable resin is used, a solvent is not necessarily required because it originally has fluidity.

  In addition, as the conductive powder constituting the conductive composition 3 ′, a low resistivity metal powder such as gold, silver, platinum, copper, tin, palladium, nickel, aluminum, or a powder made of a material other than the low resistivity metal. Plating low resistivity metal such as gold or silver on the surface (metal powder other than the above low resistivity metal, resin powder such as acrylic resin, melamine resin, inorganic powder such as silica, alumina, barium sulfate, zeolite) Preferred examples include conductive carbon powders such as graphite and carbon black. Also, conductive ceramics or conductive organic polymer compound powders can be used. The shape can also be selected from a spherical shape, a spheroid shape, a polyhedron shape, a scale shape, a disk shape, a fiber shape (or needle shape), and the like. These materials and shapes may be appropriately mixed and used. Since the size of the conductive powder is arbitrarily selected according to the type, it cannot be specified unconditionally. For example, in the case of scale-like silver powder, the powder having an average particle diameter of about 0.1 to 10 μm is used. In the case of carbon black powder, those having an average particle diameter of about 0.01 to 1 μm can be used.

  The content of the conductive powder in the conductive composition 3 ′ is arbitrarily selected according to the conductivity of the conductive powder and the form of the powder. For example, the content of the solid content of the conductive composition 3 ′ is 100 parts by weight. Among them, the conductive powder can be contained in the range of 40 to 99 parts by weight. In the present application, the average particle diameter refers to a value measured by a particle size distribution meter or TEM observation. In the case of an aspherical shape such as a polyhedron shape or a fiber shape, the particle size is usually defined by the diameter of the circumscribed sphere, the diagonal length, or the side length of the longest side.

  In the present invention, the conductive mesh 3 is formed by printing (transferring) the conductive composition 3 ′ having the binder resin component and the conductive component. Therefore, if the blending of the conductive component is adjusted, the conductive mesh 3 The resistance value can be easily controlled. On the other hand, there are hard and soft binder resin components, and there is also a difference in light resistance. Therefore, if the type and blending amount are adjusted, the durability of the conductive mesh 3 can be controlled. . As a result, the conductive mesh 3 is not destroyed and the conductive mesh 3 having a desired resistance value can be provided.

Further, an appropriate additive may be added to the conductive composition 3 ′ for the purpose of improving the quality. For example, carbon black is not necessary because it is black in itself, but by adding a predetermined amount of black pigment or black dye as necessary, the contrast when the touch panels 50A and 50B are configured is improved and visibility is improved. Can be improved. Further, in order to prevent reflection due to metallic luster of the metal layer 11, which will be described later, to suppress color unevenness, metallic color, etc., it is desirable to contain such a black pigment or black dye. Examples of black pigments include carbon black, Fe ₃ O ₄ , CuO—Cr ₂ O ₃ , CuO—Fe ₃ O ₄ —Mn ₂ O ₃ , and CoO—Fe ₂ O ₃ —Cr ₂ O ₃ that also function as conductive powder. The type and shape are not particularly limited, and a black pigment or black dye having a large coloring power with an average particle diameter of 0.1 μm or less that can be easily dispersed in the binder resin is preferable. In addition, when using carbon black, carbon black for coloring materials such as channel black, furnace black or lamp black, conductive carbon black, acetylene black and the like can be mentioned, and among them, the average particle diameter is 20 nm or less. Is preferably used. As the black dye, a dye such as aniline black can be used. Moreover, in order to improve the fluidity and stability of the conductive composition 3 ′, as long as the conductivity and adhesion to the primer layer 2 are not adversely affected, a filler, a thickener, a surfactant, An antioxidant or the like may be added.

  As shown in the manufacturing process diagram of FIG. 9, the conductive mesh 3 is formed after first applying the conductive composition 3 ′ to the plate-like or cylindrical plate surface 61 in which the concave portions 62 are formed in a predetermined mesh pattern. Then, the conductive composition adhering outside the recess 62 is scraped off by a doctor blade, a wiping roll or the like (not shown), and the recess 62 is filled with the conductive composition 3 ′. Next, the transparent base material 1 in which the primer layer 2 retaining fluidity is formed on one surface is prepared, and the primer layer 2 side of the transparent base material 1 and the conductive composition 3 ′ are filled in the recess 62. After the plate surface 61 is pressure-bonded, the conductive composition 3 ′ and the primer layer 2 are brought into close contact with each other without any gap, and the fluidity of the primer layer 2 is lost (cured) in that state or in that state. Then, the conductive composition 3 ′ is transferred onto the primer layer 2 to form the conductive composition 3 ′ having a predetermined mesh pattern. After transferring the conductive composition 3 ′ onto the primer layer 2, both the primer layer 2 and the conductive composition 3 ′ or the conductive composition 3 ′ are cured (for example, drying treatment, ultraviolet The conductive mesh 3 is formed by performing electron beam irradiation treatment, heat treatment, cooling treatment, and the like.

  In the present invention, as described above, when excess conductive composition other than in the concave portion 62 is scraped off by a doctor blade, a wiping roll, or the like, the dent generated in the upper portion of the conductive composition 3 ′ in the concave portion 62. 13 is filled with the primer layer 2 that retains fluidity, and the primer layer 2 is semi-cured or cured in a state where the conductive composition 3 ′ and the primer layer 2 are closely adhered to each other. The conductive composition 3 'can be transferred without transfer failure.

  In the above description, the conductive composition 3 ′ is mainly composed of conductive powder and binder resin. Such a conductive composition 3 ′ itself becomes the conductive mesh 3, but other conductive compositions may be applied in the present invention. For example, using a sol (dispersion liquid) of an organometallic compound as the conductive composition 3 ′, for example, solidified by heating before and after the transfer step, and further fired as necessary to form a conductive mesh made of a conductive metal or metal compound. It may be 3. Further, for example, a known conductive resin such as polythiophene may be used as the conductive composition 3 ′ and itself may be used as the conductive mesh 3.

  The obtained conductive mesh 3 has (1) a form in which the interface 14 with the primer layer 2 is in a non-linear manner, and (2) a primer component contained in the primer layer 2 in the vicinity of the interface 14 with the primer layer 2. In the form in which there is a region where the components constituting the conductive composition 3 ′ are mixed, (3) the primer component contained in the primer layer 2 is present in the conductive composition constituting the conductive mesh 3. It is formed in any one or 2 or more.

  The form (1) is a case where the interface is configured to be the interface 14 between the resin constituting the primer layer 2 and the resin or filler constituting the conductive mesh 3. The “filler” in this case is an arbitrary powder and may be a conductive powder or a non-conductive powder. For example, when the conductive composition 3 ′ is composed of a conductive powder and a binder resin, the interface 14 includes the conductive powder in the conductive mesh 3, the binder resin, and the resin constituting the primer layer 2. Are formed in a non-linear manner. The degree of intricacy at this time is affected by the shape and size of the conductive powder. In addition, for example, when the conductive composition 3 ′ does not contain a filler and contains a conductive resin or a conductive compound, the primer layer 2 and the conductive layer 3 are electrically conductive by the pressure when the primer layer 2 is pressure-bonded in the recess. The interface 14 with the mesh 3 is complicated. Since the conductive mesh 3 has a configuration in which the interface 14 is in a non-linear manner, the adhesion between the primer layer 2 and the conductive mesh 3 is remarkably increased due to a so-called anchoring effect.

  In the form of (2), there is a region where the primer component contained in the primer layer 2 and the component constituting the conductive composition 3 ′ are mixed in the vicinity of the interface 14 between the primer layer 2 and the conductive mesh 3. It is the form which is doing. At this time, the interface 14 may appear clearly, or an unclear and ambiguous interface 14 may appear. The mixed region exists so as to sandwich the interface 14 vertically. In this case, a primer component (for example, a solvent) in the primer layer 2 and an arbitrary component (for example, a monomer component) in the conductive mesh 3 penetrate into each other. The mixed region may exist only on the upper side of the interface 14 or only on the lower side. The case where the mixed region exists only above the interface 14 is a case where the primer component in the primer layer 2 enters the conductive mesh 3 and any component in the conductive mesh 3 does not enter the primer layer 2. On the other hand, when the mixed region exists only below the interface 14, any component in the conductive mesh 3 enters the primer layer 2, and the primer component in the primer layer 2 enters the conductive mesh 3. This is the case. Note that the thickness of the mixed region is not particularly limited. Since such a conductive mesh 3 has a mixed region in the vicinity of the interface 14, the adhesion between the primer layer 2 and the conductive mesh 3 is remarkably high.

  The form (3) is a form in which the primer component contained in the primer layer 2 is present in the conductive composition 3 ′ constituting the conductive mesh 3. In this form, there are many cases where the primer component is large near the interface 14 and decreases toward the top portion. However, the embodiment is not particularly limited, and in short, if the primer component exists in the conductive mesh 3. Good. The primer component may penetrate into the conductive mesh 3 to the extent that it is detected from the top of the conductive mesh 3 or may be detected to the vicinity of the interface 14. In this embodiment, in particular, when the region where the primer component is present in the conductive mesh 3 is localized in the vicinity of the interface 14, the mixed region is only above the interface 14 in the above (2) configuration. It can be said that it corresponds to the existing form. Even if such a conductive mesh 3 has the conductive mesh 3 formed on the mountain-shaped primer layer 2 which is not a flat surface in the first place, as in the case of the forms (1) and (2), the adhesion is good. In addition, since the primer component has penetrated to the extent that it exists in the conductive mesh 3 as described above, the adhesion between the primer layer 2 and the conductive mesh 3 is remarkably increased.

(Metal layer)
As shown in FIG. 6, when the metal layer 11 cannot be adjusted to a desired resistance value only by the conductive mesh 3, the metal layer 11 is formed as necessary to lower the resistance value. Usually, it is formed on the conductive mesh 3 by plating. Plating methods include electro (electrolytic) plating, electroless plating, etc. Electroplating can increase the plating rate several times by increasing the amount of current compared to electroless plating, and productivity Can be remarkably improved.

  In the case of electroplating, power feeding to the conductive mesh 3 is performed from an electrode such as a current-carrying roll brought into contact with the surface on which the conductive mesh 3 is formed, but the conductive mesh 3 has conductivity to the extent that electroplating is possible. Electroplating can be performed without problems. Examples of the material constituting the metal layer 11 include copper, silver, gold, chromium, nickel, and tin, which are highly conductive and can be easily plated. Note that after the metal layer 11 is formed, the metal layer 11 may be blackened or the surface may be roughened as necessary. These treatments can be preferably applied so that the metal color of the metal layer 11 is not visually recognized when the electrode film is provided on the display surface of the display device. Examples of the blackening treatment include blackening nickel plating and copper-cobalt alloy plating.

(Filled bed)
As shown in FIG. 3, the filling layer 9 can be arbitrarily provided in the opening 19 of the conductive mesh 3. By providing the filling layer 9 in the opening 19, the height (thickness T _C ) of the conductive mesh 3 can be reduced, and therefore the conductor (conductive mesh or transparent conductive film) of the electrode film that the conductive mesh 3 faces. ), The strength of the conductive mesh 3 can be increased. In addition, the thickness of the filling layer 9 should just be the thickness which the top part of the electroconductive mesh 3 is not hidden, for example, should just be about 40%-80% of the height of the electroconductive mesh 3. FIG.

  The material for forming the filling layer 9 is not particularly limited, but it is preferable to use the same material as the material for forming the primer layer 2 described above from the viewpoint of the adhesiveness of the opening 19 to the primer layer 2 and light transmittance. . The formation method of the filling layer 9 is not particularly limited, but the filling layer 9 is provided in such a manner that it does not ride on the top of the conductive mesh 3 by printing or applying a predetermined amount on the entire surface after the conductive mesh 3 is provided. Can do.

(Hard coat layer)
As shown in FIGS. 1 to 3, the hard coat layer 4 is provided on a surface S <b> 2 opposite to the formation surface S <b> 1 of the conductive mesh 3 of the transparent substrate 1. The surface on which the hard coat layer 4 is formed is the surface that comes into contact with the input pen or the like. By forming the hard coat layer 4 on the surface S2, the conductive mesh when the touch pen sliding durability test is performed. 3 is remarkably reduced, and good sliding durability test results can be obtained. The reason for this is not clear, but perhaps the provision of the hard coat layer 4 suppresses local pushing of the electrode film 10 by the pen tip of the touch pen (input pen 40) as shown in FIGS. As a result, the local deformation is reduced, and on the surface of the hard coat layer 4, the slip of the pen tip of the input pen 40 is improved, and the concentration of addition of 3 to the conductive mesh is presumed to be dispersed. The

  As a characteristic of the hard coat layer 4 exhibiting such an action, a case where the pencil hardness is 2H to 4H is preferable as shown in Examples described later. When the pencil hardness of the hard coat layer 4 is other than 2H to 4H, the conductive mesh 3 may be broken when a touch pen sliding durability test is performed as shown in a comparative example described later. The hard coat layer generally indicates a layer having a hardness of “H” or higher in a pencil hardness test specified by JIS K 5600-5-4 (1999), but the hard coat layer 4 provided in the present invention. Has a hardness of 2H to 4H on the surface of the hard coat layer by a pencil hardness test.

  Further, the hard coat layer 4 has a low friction coefficient, and it is preferable that the input pen 40 slide smoothly. The friction coefficient of the surface of the hard coat layer 4 is about 0.15 to 1.0, preferably 0.15 to 0.3. The friction coefficient measurement is obtained as a result of measurement with a Haydon surface property tester.

  The hard coat layer 4 satisfying these characteristics can be formed by blending various materials. For example, the applicant has proposed a hard coat layer having a pencil hardness of 2H to 3H in Japanese Patent Application Laid-Open No. 2008-107762 already filed, and Japanese Patent Application Laid-Open No. 2008-165040 discloses a hard coat layer of 3H to 4H. Although a coat layer is proposed, such a hard coat layer and a material for forming the hard coat layer can be preferably used.

  For example, as described in JP-A-2008-107762, as a resin composition for forming a hard coat layer, a photocurable resin and at least a part of the surface are coated with an organic component and introduced by the organic component. The thing containing the reactive inorganic fine particle which has a reactive functional group on the surface can be mentioned.

  Moreover, as described in JP-A-2008-107762, as a resin composition for forming a hard coat layer, (A) a molecular weight represented by the following formula (1) and having three or more reactive functional groups at its ends Is a polymer having a polyalkylene oxide chain of 1000 or more, (B) a compound having two or more reactive functional groups and a molecular weight of less than 10,000, and (C) at least part of the surface is coated with an organic component, Examples include curable resin compositions containing inorganic fine particles having reactive functional groups introduced by components on the surface, and capable of reacting the polymer (A), the compound (B), and the inorganic fine particles (C) with each other. it can. In particular, the polymer (A), the compound (B), and the inorganic fine particles (C) preferably have a polymerizable unsaturated group as a reactive functional group, and the content of the polymer (A) is 100% by weight of the compound (B). The amount of the inorganic fine particles (C) is preferably 10 to 60 parts by weight with respect to 100 parts by weight of the total amount of the polymer (A) and the compound (B).

(In the formula (1), X is a linear, branched, or cyclic hydrocarbon chain, which may be used alone or in combination, and the hydrocarbon chain may have a substituent, and between the hydrocarbon chains. Is a trivalent or higher valent organic group having 3 to 10 carbon atoms, excluding the substituent, which may contain hetero atoms, k represents an integer of 3 to 10. L _{1 to} L _k are each independently, an ether bond, an ester bond, or a divalent group having at least one selected from the group consisting of urethane bond, or, in each .R ₁ to R _k is a direct bond independently, a carbon number 1 to 4 of a straight-chain or branched hydrocarbon group .n1, n2 ... nk is the number of independent .Y ₁ to Y _k are each independently, a reactive functional group, or one or more reactive Indicates a compound residue having a functional group.)

  In the resin composition for forming a hard coat layer described in the above two documents, the photocurable resin includes a polymerizable monomer having a photopolymerizable functional group, a photopolymerization initiator, and, if necessary, a solvent, Examples thereof include an antistatic agent, an antiglare agent, a solvent, and other additives.

  Specifically, as the polymerizable monomer having a photopolymerizable functional group, the skeleton is not particularly limited as long as it has a photopolymerizable functional group, but a (meth) acrylic resin, a terminal or A reactive polymer having an ethylenic double bond group in the side chain is preferred. The (meth) acrylic resin is not particularly limited as long as it is a resin containing a skeleton of a (meth) acrylic resin. The hard coat layer may contain one or more of the above (meth) acrylic resins. Specifically, as the (meth) acrylic resin, a polymer obtained by polymerizing one or more of urethane (meth) acrylate, epoxy (meth) acrylate, polyester (meth) acrylate, polyether (meth) acrylate and the like is polymerized. Among them, a polymer obtained by polymerizing one or more of urethane (meth) acrylate and epoxy (meth) acrylate is preferably used from the viewpoint of compatibility with other components.

  The (meth) acrylic resin is a reactive monomer having three or more polymerizable functional groups, particularly a monomer having the functional group at the terminal or side chain in the presence of a polymerization initiator by light irradiation or heat. A polymerized polymer is preferred. Here, the light includes not only electromagnetic waves having wavelengths in the visible and invisible regions, but also particle beams such as electron beams, and radiation or ionizing radiation that collectively refers to electromagnetic waves and particle beams.

  The hard coat layer 4 may contain other resins in addition to the (meth) acrylic resin. For example, one type selected from the group consisting of polyester resin, polyolefin resin, polycarbonate resin, polyamide resin, polyether resin, epoxy resin, oxetane resin, urethane resin, alkyd resin, spiroacetal resin, polybutadiene resin, polythiol polyether resin Two or more resins can be included. When the hard coat layer contains the other resin, the blending ratio (weight ratio) of the (meth) acrylic resin and the other resin is 10: 0 to 1: 9, and further 9: 1 to 6: 4. preferable.

On the other hand, the average particle size of the inorganic fine particles is preferably 20 to 500 nm, and the organic component covering the inorganic fine particles is 1.00 × 10 ⁻³ g / unit area of the inorganic fine particles before coating. It is preferable that m ² or more is contained. In addition, inorganic fine particles are saturated or unsaturated carboxylic acid, acid anhydride, acid chloride, ester and acid amide corresponding to the carboxylic acid, amino acid, imine, nitrile, isonitrile, epoxy compound, amine, β-dicarbonyl compound Inorganic particles are dispersed in water and / or an organic solvent as a dispersion medium in the presence of at least one surface modification compound having a molecular weight of 500 or less selected from the group consisting of silane, and a metal compound having a functional group It is preferable that it is obtained by this. Moreover, it is preferable that the surface modification compound is a compound having at least one hydrogen bond forming group, or at least one of the surface modification compounds is a compound having a polymerizable unsaturated group. In addition, an inorganic fine particle is obtained by discharging a monomer in which inorganic fine particles having a particle diameter of 500 nm or less are dispersed in a hydrophobic vinyl monomer into water through a hydrophilicized porous film, and an aqueous dispersion of monomer droplets in which the inorganic fine particles are dispersed. Then, it is preferably obtained by polymerization. In addition, a compound in which the inorganic fine particles include a reactive functional group introduced into the surface of the inorganic fine particles, a group represented by the following formula (2), and a silanol group or a group that generates a silanol group by hydrolysis, and metal oxide fine particles It is preferable that it is obtained by combining.

(In Formula (2), Q ¹ represents NH, O (oxygen atom), or S (sulfur atom), and Q ² represents O or S.)

  The hard coat layer 4 is formed by a coating or printing method, and the thickness thereof is preferably 5 to 15 μm, and more preferably 6 to 10 μm.

  The conventional hard coat layer is provided on the surface of the electrode film 10 constituting the touch panel so as to prevent the surface from being damaged. In the electrode film 10 of the present invention, the hard coat layer 4 is provided. It is provided to prevent destruction of the conductive mesh 3 provided on the surface S1 opposite to the side surface S2. The hard coat layer 4 can prevent destruction of the conductive mesh 3 provided on the opposite side across the transparent base material 1 because the hard coat layer 4 used in the present invention has a pencil hardness of 2H to 4H (preferably 3H). 4H), and by providing such a hard hard coat layer 4, the rigidity of the entire electrode film 10 is increased and the deflection is reduced. As described above, the input pen as shown in FIGS. 7 and 8 is used. This is because the local pushing of the electrode film 10 by the 40 nibs is suppressed and the local deformation is reduced. The hard coat layer 4 used in the present invention leads to generation of extremely different effects with respect to the electrode film 10 of the present invention. Such an effect has been sufficiently confirmed at least in the experimental examples described later, and in particular, unlike a conventional conductive layer made of a transparent conductive film such as ITO, a metal-only layer, or a layer made of an inorganic oxide. Compared to these layers, the conductive mesh 3 containing a resin component that is considered to be relatively soft and containing a binder resin and a conductive material seems to be specific.

  Such a hard coat layer 4 is also effective in the manufacturing method. For example, in the process shown in FIG. 9, since it is inconvenient in handling to provide the hard coat layer 4 on the other surface S2 after providing the conductive mesh 3 on one surface S1, the hard coat layer 4 is previously formed on the transparent base. After being provided on the material 1, a procedure for transferring and printing the conductive mesh 3 is performed. In this case, in the transfer printing, when the conductive composition 3 ′ applied to the plate surface is scraped off with a doctor blade or the like, a dent 13 as shown in FIGS. 9A and 9B is generated. However, the film in which the hard coat layer 4 is previously provided on the transparent substrate 1 has high rigidity, and the flowable uncured primer layer 2 as in the present invention is not provided on the plate surface side. It is extremely difficult to transfer and print the conductive composition 3 ′ in the recess 62 of the plate 60. However, in the present invention, since the uncured primer layer 2 having fluidity is provided on the plate surface side, even the highly transparent transparent substrate 1 provided with the hard coat layer 4 does not have the recess 62. It is possible to fill up the recess 13 of the conductive composition 3 ′ and lose the transfer defect. This is because the hard coat layer for preventing the surface from being damaged usually has the effect of preventing the damage on the surface opposite to the surface and preventing the transfer failure from being deteriorated. Play.

(Other layers)
In the present invention, an arbitrary layer may be provided between each layer. For example, as shown in FIGS. 2 and 3, an easy-adhesion layer 5 for facilitating the adhesion of the hard coat layer 4 may be provided between the transparent substrate 1 and the hard coat layer 4. The easy-adhesion layer 5 is usually available as PET with an easy-adhesion layer, and for example, Toyobo A4300 can be used. Further, an AR (antireflection layer) 6 may be provided on the surface of the hard coat layer 4 on the most observer side of the touch panel, and other functional layers may be provided as necessary.

(Production method)
FIG. 9 is an explanatory view of the method for producing the electrode film 10 of the present invention. As shown in FIG. 9, the manufacturing method of the electrode film 10 of the present invention includes a plate surface 61 having a predetermined pattern of recesses 62 filled with an uncured conductive composition 3 ′, and the conductive composition 3 ′. One surface S1 of the transparent substrate 1 to be transferred is pressure-bonded via a primer layer 2 that can maintain fluidity until it is cured, and then at least the primer layer 2 is cured in a state in which the pressure-bonding is retained, Thereafter, the transparent substrate 1 and the primer layer 2 are peeled off from the plate surface 61, and the conductive composition 3 'is transferred to the one surface S1 of the transparent substrate 1 through the primer layer 2 in a predetermined pattern.

  Specifically, FIG. 9 (A) shows a transparent group on the side where the primer layer 2 that can maintain fluidity until cured on the plate surface 61 in which the uncured conductive composition 3 ′ is filled in the recess 62. In this step, the material 1 is to be pressure-bonded. FIG. 9B shows the primer layer 2 that can maintain fluidity until it is cured so that the uncured conductive composition 3 ′ is filled in the recess 62 and further covers the entire plate surface 61 including the recess 61. The transparent substrate 1 is to be pressure-bonded from above the primer layer 2. That is, both of these two steps are a plate surface 61 having a predetermined pattern of recesses 62 filled with an uncured conductive composition 3 ′, and a transparent substrate that is a transfer target of the conductive composition 3 ′. 1 shows a step of pressing one surface S1 through a primer layer 2 that can maintain fluidity until it is cured. Any of these two steps may be applied to the method for producing a printed material of the present invention. In addition, it is preferable to provide the hard coat layer 4 and the like (including the AR layer 6 and the like provided as necessary) in advance on the other surface S2 of the transparent substrate 1.

  FIG. 9C is a step of pressure bonding the transparent substrate 1 and the plate surface 61 via the primer layer 2 that can maintain fluidity until it is cured. After passing through the process route of FIG. 9A, when the conductive composition 3 ′ is scraped off from the plate surface 61 using a doctor blade, a wiping roll, or the like, the “dent 13 of the conductive composition 3 ′” Although it occurs in 62, the dent 13 is filled with the primer layer 2 having fluidity until it is cured at the time of pressure bonding. In the process route of FIG. 9B, when the primer layer is provided on the plate surface 61, the primer layer 2 fills the recess 13. Therefore, in the step of FIG. 9C, the transparent base material 1 and the plate surface 61 are pressure-bonded in a mode through the primer layer 2, and as a result, the primer layer 2 having fluidity is cured until it is cured. Since the 3 ′ dent 13 is filled, at least the primer layer 2 is cured in the present invention while the pressure bonding is maintained. “At least” means that only the primer layer 2 is cured and the conductive composition 3 ′ is not cured, and that the primer layer 2 and the conductive composition 3 ′ are simultaneously cured. . And it is preferable to perform the hardening process by ionizing radiation irradiation or cooling.

  FIG. 9D shows a mode in which the transparent substrate 1 and the primer layer 2 are peeled off from the plate surface 61 thereafter. In the obtained electrode film 10, the conductive composition 3 ′ was able to be transferred in a predetermined pattern onto one surface S <b> 1 of the transparent substrate 1 through the primer layer 2. Here, FIGS. 9C and 9D show shapes close to actual cross-sectional observation results, but the shapes of the primer layer 2 and the conductive mesh 3 shown in FIG. The reason that the shapes of the primer layer 2 and the conductive composition 3 ′ shown in FIG. 2 do not completely match is that the constituent materials of both layers are resin materials having plasticity. The conductive mesh 3 may be cured in the process of FIG. 9C, or may be cured after the peeling process of FIG. 9D.

  As described above, according to the electrode film 10 for a touch panel according to the present invention, the surface S2 on the side where the conductive mesh 3 is not formed among the both surfaces S1, S2 of the transparent substrate 1, that is, the input pen 40 or the like is in contact. By forming the hard coat layer 4 on the surface on the side to be touched, the breakage of the conductive mesh 3 in the case of performing the touch pen sliding durability test is remarkably reduced, and good results can be obtained. According to the touch panels 50A and 50B according to the present invention in which the electrode film 10 is disposed at least on the input side, the destruction of the conductive mesh 3 when the touch pen sliding durability test is performed is significantly reduced, and the durable touch panel and can do.

  The touch panel electrode film 10 and the touch panels 50A and 50B according to the present invention include a touch panel mounted on a display surface of a small game machine, a display surface of a computer display, a display surface of a TV display, a display surface of electronic paper, or the like. It can be preferably used as a constituent member. Such a display device may be any one of a liquid crystal display device, a plasma display device, an EL display device, an electrophoretic display device, and the like.

  Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples. In the following, “part” and “%” are based on mass unless otherwise specified. As the particle size distribution of the monodisperse fine particles blended in the composition, those having an average particle diameter of ± 0.3 to ± 1 μm are used. However, when the particle diameter is 3.5 μm or less, the particle size distribution is not limited.

Example 1
As the transparent substrate 1, a colorless and transparent polyethylene terephthalate (PET) film (Toyobo A4300) having a width of 1000 mm and a thickness of 100 μm and having an easy adhesion treatment on one side was used. The PET film set in the supply part is fed out, and urethane acrylate (purple light UV1700-B: trade name, Nippon Gohsei Co., Ltd.) is used as a hard coat layer composition on the easy-adhesion layer previously formed on one surface S2 of the PET film. A mixture of 70 parts of silica fine particles and 30 parts of silica fine particles prepared as described below was applied at a dry thickness of about 7 μm and cured with a light amount of 150 mJ to form a hard coat layer.

<Preparation of silica fine particles>
(1) Surface adsorbed ion removal;
3 using water-dispersed colloidal silica (Snowtex ZL, trade name, manufactured by Nissan Chemical Industries, Ltd., pH 9-10) with a particle size of 90 nm using 400 g of cation exchange resin (Diaion SK1B, manufactured by Mitsubishi Chemical Corporation). After performing ion exchange for 3 hours, and then ion exchange for 3 hours using 200 g of anion exchange resin (Diaion SA20A, manufactured by Mitsubishi Chemical Corporation), it was washed and washed with water of silica fine particles having a solid content concentration of 20% by weight. A dispersion was obtained. At this time, the Na ₂ O content of the aqueous dispersion of silica fine particles was 7 ppm for each silica fine particle.

(2) Surface treatment (introduction of monofunctional monomer);
150 g of isopropanol, 4.0 g of 3,6,9-trioxadecanoic acid, and 4.0 g of methacrylic acid are added to 10 g of the silica fine particle aqueous dispersion subjected to the treatment of (1) above, and the mixture is stirred for 30 minutes. Mixed. The obtained mixed liquid was stirred while heating at 60 ° C. for 5 hours to obtain a silica fine particle dispersion in which a methacryloyl group was introduced on the surface of the silica fine particles. Distilled water and isopropanol were distilled off using a rotary evaporator, and the resulting silica fine particle dispersion was added with methyl ethyl ketone so as not to dry, while finally making the remaining water and isopropanol 0.1% by weight, A silica-dispersed methyl ethyl ketone solution having a solid content of 50% by weight was obtained. The “silica fine particles” thus obtained had an average particle diameter of d50 = 54 nm as a result of measurement using a Microtrac particle size analyzer manufactured by Nikkiso Co., Ltd. Further, the amount of the organic component covering the surface of the silica fine particles was 4.0 × 10 ⁻³ g / m ² as a result of measurement by thermogravimetric analysis.

  Next, the photocurable resin composition for the primer layer was applied and formed on the other surface S1 of the PET film so as to have a thickness of 5 μm. The application method employs a normal gravure reverse coating method, and the photocurable resin composition includes 35 parts by weight of an epoxy acrylate prepolymer, 12 parts by weight of a urethane acrylate prepolymer, and 44 weights of a monofunctional acrylate monomer comprising phenoxyethyl acrylate. 9 parts by weight of trifunctional acrylate monomer consisting of ethylene oxide-modified isocyanuric acid triacrylate, and further 3 parts by weight of Irgacure 184 (substance name: 1-hydroxy-cyclohexyl-phenyl-ketone, manufacturer: Ciba Specialty Chemicals) as a photoinitiator The added one was used. The viscosity at this time was about 1300 mPa · s (25 ° C., B-type viscometer), and the primer layer 2 after application showed fluidity when touched, but did not flow down from the PET film.

  Next, the PET film on which the primer layer is formed is subjected to an intaglio roll that performs a transfer process. Prior to that, concave portions that form a grid-like mesh pattern with a line width W of 20 μm, a line pitch P of 300 μm, and a plate depth of 8 μm are formed. The conductive composition was applied to the plate surface of the formed intaglio roll with a pick-up roll, and the conductive composition other than the inside of the recess was scraped off with a doctor blade to fill only the inside of the recess with the conductive composition. A primer film is supplied between the intaglio roll in a state where the conductive composition is filled in the recess and the nip roll, and the primer layer is supplied by the pressing force (biasing force) of the nip roll against the intaglio roll. Was allowed to flow into the recess of the conductive composition present in the recess, causing the conductive composition and the primer layer to adhere to each other without any gap, and a part of the primer was allowed to penetrate into the conductive composition in the recess. . In addition, the used conductive composition used the silver carbon paste of the following compositions.

<Preparation of conductive composition (silver paste + carbon black)>
100 parts by weight of flaky silver powder having an average particle size of about 2 μm as conductive powder, 45 parts by weight of acetylene black (average particle size 35 nm) as carbon black, thermoplastic polyester urethane resin as binder resin, solvent Then, butyl carbitol acetate was further blended, sufficiently stirred and mixed, and then kneaded with three rolls to prepare a conductive composition.

  Next, the transfer process performed is as follows. First, the PET film on which the primer layer is formed is sandwiched between the intaglio roll and the nip roll in a state where the primer layer faces the plate surface side of the intaglio roll. Between the intaglio roll and the nip roll, the primer layer of the PET film is pressed against the plate surface. Since the primer layer has fluidity, the primer layer pressed against the plate surface also flows into the recess filled with the conductive composition, and fills the recess of the conductive composition generated in the recess ( (See FIG. 9). Thus, the primer layer is in close contact with the conductive composition without any gap. Thereafter, the intaglio roll further rotates and is irradiated with ultraviolet rays by a UV lamp made of high-pressure mercury lamp, and the primer layer made of the photocurable resin composition is cured. Due to the curing of the primer layer, the conductive composition in the recess of the intaglio roll comes into close contact with the primer layer, and then the film is peeled off from the intaglio roll by the nip roll on the outlet side, and the conductive composition is transferred onto the primer layer. (See FIG. 9). The transfer film thus obtained was passed through a drying zone at 110 ° C. to evaporate the solvent of the silver carbon paste and solidified to form a conductive mesh having a mesh pattern on the primer layer. At this time, the thickness of the pattern portion where the conductive mesh exists (thickness difference between the mesh pattern portion where the conductive mesh is formed and the other portion) is about 8 μm, which is almost equal to the depth of the plate. The silver carbon paste in the recesses of the plate was transferred with a high transfer rate. When the inside of the concave portion after the transfer was visually observed, no plate residue of the paste was observed, and no disconnection or shape defect of the mesh pattern was observed.

  Thus, an electrode film of Example 1 according to the present invention was produced. The surface resistance value of the grid-like conductive mesh having a line width W of 20 μm, a line pitch P of 300 μm, and a height of 8 μm was 700Ω / □.

[Example 2]
In Example 1, the hard coat layer composition was replaced with the following, and a WET weight of 40 g / m ² (dry weight of 20 g / m ² ) was applied on the transparent substrate to the following hard coat layer composition. The electrode film of Example 2 was formed in the same manner as in Example 1 except that the film was dried at 50 ° C. for 30 seconds and irradiated with ultraviolet rays of 200 mJ / cm ² . The surface resistance value of the conductive mesh was 700Ω / □.

<Adjustment of composition for hard coat layer>
(1) Surface adsorbed ion removal;
Water-dispersed colloidal silica having a particle size of 90 nm (Snowtex ZL, trade name, manufactured by Nissan Chemical Industries, Ltd., solid content concentration 40% by weight, pH 9-10) was exchanged with a cation exchange resin (Diaion SK1B, Mitsubishi Chemical Corporation). The product was ion-exchanged for 3 hours using 400 g, and then ion-exchanged for 3 hours using 200 g of anion exchange resin (Diaion SA20A, manufactured by Mitsubishi Chemical Corporation), followed by washing and solid content concentration of 20 An aqueous dispersion of silica particles having a weight% of 1% was obtained. At this time, the content of Na2O in the aqueous dispersion of silica-based fine particles was 7 ppm per silica fine particle.

(2) Surface treatment (introduction of monofunctional monomer);
150 g of isopropanol, 4.0 g of 3,6,9-trioxadecanoic acid, and 4.0 g of methacrylic acid are added to 10 g of the silica fine particle aqueous dispersion subjected to the treatment of (1) above, and the mixture is stirred for 30 minutes. Mixed. The obtained mixed liquid was stirred while heating at 60 ° C. for 5 hours to obtain a silica fine particle dispersion in which a methacryloyl group was introduced on the surface of the silica fine particles. Distilled water and izopropanol were distilled off from the obtained silica fine particle dispersion using a rotary evaporator, and while adding methyl ethyl ketone so as not to dry, the final residual water and isopropanol were 0.1% by weight, A silica-dispersed methyl ethyl ketone solution having a solid content of 50% by weight was obtained. The “inorganic fine particles” thus obtained had an average particle diameter of d50 = 92 nm as a result of measurement with a Microtrac particle size analyzer manufactured by Nikkiso Co., Ltd. The amount of the organic component covering the surface of the silica fine particles was 4.05 × 10 ⁻³ g / m ² as a result of measurement by thermogravimetric analysis.

(3) Preparation of curable resin composition for hard coat layer;
The following components were mixed and adjusted to a solid content of 50% by weight with a solvent to prepare a curable resin composition for a hard coat layer.

BS371 (trade name beam set 371; manufactured by Arakawa Chemical, containing 50% by weight of the polymer (A) (molecular weight 40000) and 50% by weight of the compound (B) (urethane acrylate): 20 parts by weight (solid content) Conversion value)
UV1700B (trade name, manufactured by Nippon Synthetic Chemical Co., Ltd .; corresponding to the above compound (B), urethane acrylate, 10 functional, molecular weight 2000): 50 parts by weight (in terms of solid content)
-"Inorganic fine particles" obtained in (2) above: 30 parts by weight (in terms of solid content)
・ Methyl ethyl ketone: 100 parts by weight ・ Irgacure 184 (trade name, manufactured by Ciba Specialty Chemicals, radical polymerization initiator): 0.4 parts by weight

[Example 3]
In Example 1, the electrode film of Example 3 was formed in the same manner as in Example 1 except that the conductive composition was replaced with the following. The surface resistance value of the conductive mesh was 5Ω / □.

<Preparation of conductive composition (silver paste)>
As conductive powder, 65 parts by weight of flaky silver powder having an average particle size of about 2 μm is blended with 7 parts by weight of thermoplastic polyester urethane resin as binder resin, thermoplastic polyester urethane resin as binder resin, and butyl carbyl as solvent. Tall acetate was further blended and sufficiently stirred and mixed, and then kneaded with three rolls to prepare a conductive composition.

[Example 4]
In Example 2, the electrode film of Example 4 was formed in the same manner as in Example 2 except that the conductive composition was replaced with the following. The surface resistance value of the conductive mesh was 5Ω / □.

<Preparation of conductive composition (silver paste)>
As conductive powder, 65 parts by weight of flaky silver powder having an average particle size of about 2 μm is blended with 7 parts by weight of thermoplastic polyester urethane resin as binder resin, thermoplastic polyester urethane resin as binder resin, and butyl carbyl as solvent. Tall acetate was further blended and sufficiently stirred and mixed, and then kneaded with three rolls to prepare a conductive composition.

[Example 5]
In Example 1, the electrode film of Example 5 was used in the same manner as in Example 1 except that the conductive material was UV conductive ink (P-553, PVA photocuring type) manufactured by Chukyo Yushi Co., Ltd. Formed. The surface resistance value of the conductive mesh was 5000Ω / □.

[Example 6]
In Example 2, the electrode film of Example 6 was used in the same manner as Example 2 except that the conductive material was UV conductive ink (P-553, PVA photocuring type) manufactured by Chukyo Yushi Co., Ltd. Formed. The surface resistance value of the conductive mesh was 5000Ω / □.

[Comparative Example 1]
In Example 1, the electrode film of Comparative Example 1 was formed in the same manner as in Example 1 except that the hard coat layer was not formed. The surface resistance value of the conductive composition (carbon paste) used for forming the conductive mesh was 700Ω / □.

[Comparative Example 2]
In Example 3, the electrode film of Comparative Example 2 was formed in the same manner as Example 3 except that the hard coat layer was not formed. In addition, the surface resistance value of the conductive composition (carbon paste) used for forming the conductive mesh was 5Ω / □.

[Comparative Example 3]
In Example 5, the electrode film of Comparative Example 3 was formed in the same manner as in Example 5 except that the hard coat layer was not formed. The surface resistance value of the conductive composition (carbon paste) used for forming the conductive mesh was 5000 Ω / □.

[Test methods and results]
Pencil hardness test: Using a pencil having a different hardness, the test was conducted in accordance with JIS K 5600 under a load of 500 g.

  Sliding test: The measurement board laid below is a glass substrate, and the conductive mesh is placed on the glass substrate, and the input pen is pressed from above with a load of 300 g (as shown in FIG. 8). The experiment was conducted using an experimental apparatus that can slide repeatedly under conditions of a sliding distance of 5 cm and a reciprocation of 1 second (5 cm reciprocates in 1 second). Note that the pen tip material of the input pen is polyacetal, and R is 0.8 mm.

  The results are shown in Table 1 below.

  From the results of Examples 1 to 6 and Comparative Examples 1 to 3, it was revealed that the durability of the conductive mesh was dramatically improved by providing the hard coat layer. In Examples 1 to 6, the pencil hardness of the hard coat layer was an experimental result of 3H and 4H, but good results could be obtained at least within this range. In addition, since the conductive mesh could be greatly changed by the conductive composition used in the examples, the types and blending ratios of conductive particles and conductive substances in the conductive composition, and further on If the metal layer to be plated is adjusted, the conductive mesh having the same width, pitch and height as in the embodiment can be changed in a very wide range from 5Ω to 5000Ω. This means that the electrode film on which the conductive mesh is formed is a member that is extremely convenient for use as a touch panel. The electrode films of Examples 1 to 6 according to the present invention can be obtained by filling the concave portions provided on the plate surface with the conductive composition and transferring it. Since it has also been confirmed that the hard coat layer with increased rigidity does not hinder its transferability, it is possible to provide an electrode film with high productivity and low cost.

DESCRIPTION OF SYMBOLS 1 Transparent base material 2 Primer layer 3 Conductive mesh 3 'Conductive composition 4 Hard coat layer 5 Easy adhesion layer 6 AR (antireflection) layer 7 Conductive mesh pattern part 8 Peripheral part 9 Filling layer 10, 10A, 10B, 10C, 10D electrode film 11 metal layer 12 spacer 13 recess 14 interface between primer layer and conductive mesh 19 opening 20, 30 electrode film on display device side 21 transparent substrate 23 transparent conductive film 40 input pen 50A, 50B touch panel 60 plate 61 plate surface 62 Concave part 70 Multi-touch electrode film 71 Conductive mesh divided into regions 72 Wiring

S1 One side (conductive mesh side) of transparent substrate S2 The other side (opposite side of conductive mesh) of transparent substrate W Line width of conductive mesh P Pitch between conductive meshes G Spacing between two electrode films A Part where conductive mesh is formed (pattern forming part)
T _A A thickness B Part where no conductive mesh is formed (pattern non-formation part)
T _B B thickness T _C conductive layer thickness

Claims (5)

A transparent substrate, a primer layer provided on one surface of the transparent substrate, a conductive mesh comprising a conductive composition provided in a predetermined pattern on the primer layer, and the other of the transparent substrate A hard coat layer provided on the surface to reduce the destruction of the conductive mesh ,
The coefficient of friction was measured by Hayden surface tester of the surface of the hard coat layer is Ri der 0.15 to 0.3,
The conductive composition is a binder component selected from thermoplastic resins, ionizing radiation curable resins and thermosetting resins, and at least one conductive component selected from metal fine particles, conductive fine particles and conductive organic compounds; Have
The conductive mesh is filled with the conductive composition in the concave portion of the plate surface in which the concave portion is formed with a predetermined mesh pattern, and the plate surface and the primer layer retaining fluidity are formed on one surface. An electrode film for a touch panel, which is provided in a convex shape by pressure bonding the primer layer side of a transparent substrate to transfer the conductive composition onto the primer layer .   The electrode film for touch panels of Claim 1 whose pencil hardness of the said hard-coat layer is 2H-4H. The electrode film for touchscreens of Claim 1 or 2 which has a metal layer further on the surface of the said electroconductive mesh. A touch panel in which the electrode surfaces of the two electrode films are opposed to each other at regular intervals, at least the electrode film on the input side is an electrode film having a conductive mesh as an electrode, and the electrode film includes a transparent substrate, and the transparent substrate whereas primer layer provided on the surface of the, conductive mesh made of a conductive composition disposed in a predetermined pattern on the primer layer, the conductive mesh on the other surface of the transparent substrate A hard coat layer provided to reduce the destruction of
The coefficient of friction was measured by Hayden surface tester of the surface of the hard coat layer is Ri der 0.15 to 0.3,
The conductive composition is a binder component selected from thermoplastic resins, ionizing radiation curable resins and thermosetting resins, and at least one conductive component selected from metal fine particles, conductive fine particles and conductive organic compounds; Have
The conductive mesh is filled with the conductive composition in the concave portion of the plate surface in which the concave portion is formed with a predetermined mesh pattern, and the plate surface and the primer layer retaining fluidity are formed on one surface. A touch panel characterized by being provided in a convex shape by pressure bonding the primer layer side of a transparent substrate to transfer the conductive composition onto the primer layer . The touch panel according to claim 4 , wherein the hard coat layer has a pencil hardness of 2H to 4H.

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