JP2010020559A - Input device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an input device which is excellent in visibility of an image on an image display device and prevents an operation error when the input device is disposed on the display device. <P>SOLUTION: An input device 1 includes a first transparent electrode 12 and a second transparent electrode 22 made of a conductive transparent metal oxide arranged so as to face the first transparent electrode 12. When the first transparent electrode 12 is pressed, it contacts with the second transparent electrode 22. The first transparent electrode 12 contains a π-conjugated conductive high-polymer, polyanion and metallic nanoparticles having an average particle size of 1-50 nm. The metals forming the metallic nanoparticles are one or more kinds of metals selected from a group consisting of silver, gold, nickel, copper, platinum, palladium, and indium, or an alloy thereof, and the content of the metallic nanoparticles is not less than 0.01 mass% and less than 5 mass% when the total of the π-conjugated conductive high-polymer and the polyanion is 100 mass%. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an input device such as a resistive touch panel.

The touch panel is an input device installed on the image display device, and at least a portion overlapping the image display device is transparent.
As the touch panel, for example, a resistance film type touch panel is known. In a resistive touch panel, a fixed electrode sheet and a movable electrode sheet in which a transparent electrode is formed on one side of a transparent substrate are arranged so that the transparent electrodes face each other. As a transparent electrode of an electrode sheet, an indium-doped tin oxide film (hereinafter referred to as ITO film) has been widely used.
A sheet having an ITO film formed on one side of a transparent substrate (hereinafter referred to as an ITO film-forming sheet) is suitable as a fixed electrode sheet on the image display device side because of its low flexibility and easy fixing. However, when used as a movable electrode sheet on the input side of the touch panel, there is a problem that durability when repeatedly bent is low.
Therefore, as a movable electrode sheet on the input side of the touch panel, a flexible sheet in which a transparent electrode containing a π-conjugated conductive polymer is formed on one side of a transparent substrate (hereinafter referred to as conductive polymer film formation). Sometimes referred to as a sheet).
However, when an ITO film forming sheet is used as the fixed electrode sheet on the image display device side and a conductive polymer film forming sheet is used as the movable electrode sheet on the input side of the touch panel, that is, when different conductors are connected to each other. The contact resistance is large, and problems such as a decrease in input sensitivity and a delay in coordinate input time may occur.
In order to solve these problems, Patent Document 1 proposes adding a metal ion to a transparent electrode containing a π-conjugated conductive polymer.
JP 2007-172984 A

However, in the electrode sheet described in Patent Document 1, the contact resistance to the ITO film has not been sufficiently reduced. Therefore, when the electrode sheet described in Patent Document 1 is applied to a resistive touch panel, malfunctions such as a decrease in input sensitivity and a delay in coordinate input time may occur.
Moreover, in the electrode sheet for touch panels, it is calculated | required that it is excellent in transparency and the visibility of the image of an image display apparatus is high.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an input device that is excellent in image visibility of an image display device and prevented from malfunctioning when installed on the image display device. To do.

As a result of investigation by the present inventor, it has been found that the contact resistance to the ITO film does not decrease even if the transparent electrode containing the π-conjugated conductive polymer contains metal ions. And based on the knowledge, as a result of further examination, the following input device was invented.
That is, the input device of the present invention includes a first transparent electrode, and a second transparent electrode made of a transparent conductive metal oxide disposed so as to face the first transparent electrode. In an input device that contacts the second transparent electrode when the electrode is pressed,
The first transparent electrode contains a π-conjugated conductive polymer, a polyanion, and metal nanoparticles having an average particle diameter of 1 to 50 nm,
The metal forming the metal nanoparticles is one or more metals selected from the group consisting of silver, gold, nickel, copper, platinum, palladium, and indium, or alloys thereof;
The content of the metal nanoparticles is 0.01% by mass or more and less than 5% by mass when the total of the π-conjugated conductive polymer and the polyanion is 100% by mass.

  The input device of the present invention is excellent in image visibility of the image display device when installed on the image display device and prevents malfunction.

An embodiment of the input device of the present invention will be described.
FIG. 1 shows an input device according to this embodiment. The input device 1 according to the present embodiment includes a movable electrode sheet 10 disposed on the input person side, a fixed electrode sheet 20 disposed on the image display device side so as to face the movable electrode sheet 10, and a gap therebetween. It is a resistive film type touch panel provided with the transparent dot spacer 30 provided.
The movable electrode sheet 10 includes a first transparent substrate 11 and a film-shaped first transparent electrode 12 provided on one side of the first transparent substrate 11.
The fixed electrode sheet 20 includes a second transparent substrate 21 and a film-like second transparent electrode 22 provided on one side of the second transparent substrate 21.
The first transparent electrode 12 and the second transparent electrode 22 are disposed so as to face each other, and come into contact with the second transparent electrode 22 when the first transparent electrode 12 is pressed. Yes.

<Moving electrode sheet>
(First transparent substrate)
Examples of the first transparent substrate 11 constituting the movable electrode sheet 10 include a single layer or two or more layers of a transparent resin film, a glass plate, and a laminate of a film and a glass plate. Since it has, a transparent resin film is preferable.
Examples of the transparent resin constituting the transparent resin film include polyethylene terephthalate (PET), polyethylene naphthalate, polyethersulfone, polyetherimide, polyetheretherketone, polyphenylene sulfide, polyarylate, polyimide, polycarbonate, cellulose triacetate, and cellulose. Examples include acetate propionate.

  The thickness of the first transparent substrate 11 is preferably 100 to 250 μm. If the thickness of the first transparent substrate 11 is 100 μm or more, sufficient strength can be secured, and if it is 250 μm or less, sufficient flexibility can be secured.

(First transparent electrode)
The first transparent electrode 12 contains a π-conjugated conductive polymer, a polyanion, and metal nanoparticles.

[Π-conjugated conductive polymer]
The π-conjugated conductive polymer is not particularly limited as long as the main chain is an organic polymer composed of a π-conjugated system. For example, polypyrroles, polythiophenes, polyacetylenes, polyphenylenes, polyphenylene vinylenes, Examples thereof include polyanilines, polyacenes, polythiophene vinylenes, and copolymers thereof. From the viewpoint of stability in air, polypyrroles, polythiophenes and polyanilines are preferred.
Even if the π-conjugated conductive polymer remains unsubstituted, sufficient conductivity and compatibility with the binder resin can be obtained, but in order to further improve conductivity and compatibility, an alkyl group, a carboxy group, It is preferable to introduce a functional group such as a sulfo group, an alkoxy group, or a hydroxy group into the π-conjugated conductive polymer.

  Specific examples of the π-conjugated conductive polymer include polypyrrole, poly (N-methylpyrrole), poly (3-methylpyrrole), poly (3-ethylpyrrole), poly (3-n-propylpyrrole), poly (3-butylpyrrole), poly (3-octylpyrrole), poly (3-decylpyrrole), poly (3-dodecylpyrrole), poly (3,4-dimethylpyrrole), poly (3,4-dibutylpyrrole) , Poly (3-carboxypyrrole), poly (3-methyl-4-carboxypyrrole), poly (3-methyl-4-carboxyethylpyrrole), poly (3-methyl-4-carboxybutylpyrrole), poly (3 -Hydroxypyrrole), poly (3-methoxypyrrole), poly (3-ethoxypyrrole), poly (3-butoxypyrrole), poly (3-methyl) -4-hexyloxypyrrole), poly (thiophene), poly (3-methylthiophene), poly (3-ethylthiophene), poly (3-propylthiophene), poly (3-butylthiophene), poly (3-hexyl) Thiophene), poly (3-heptylthiophene), poly (3-octylthiophene), poly (3-decylthiophene), poly (3-dodecylthiophene), poly (3-octadecylthiophene), poly (3-bromothiophene) , Poly (3-chlorothiophene), poly (3-iodothiophene), poly (3-cyanothiophene), poly (3-phenylthiophene), poly (3,4-dimethylthiophene), poly (3,4-dibutyl) Thiophene), poly (3-hydroxythiophene), poly (3-methoxythiophene), poly (3 -Ethoxythiophene), poly (3-butoxythiophene), poly (3-hexyloxythiophene), poly (3-heptyloxythiophene), poly (3-octyloxythiophene), poly (3-decyloxythiophene), poly (3-dodecyloxythiophene), poly (3-octadecyloxythiophene), poly (3-methyl-4-methoxythiophene), poly (3,4-ethylenedioxythiophene), poly (3-methyl-4-ethoxy) Thiophene), poly (3-carboxythiophene), poly (3-methyl-4-carboxythiophene), poly (3-methyl-4-carboxyethylthiophene), poly (3-methyl-4-carboxybutylthiophene), polyaniline , Poly (2-methylaniline), poly (3-isobutyla) Phosphorus), poly (2-aniline sulfonic acid), poly (3-aniline sulfonic acid), and the like. Among them, poly (3,4-ethylenedioxythiophene) is preferable from the viewpoint of conductivity and heat resistance.

[Polyanion]
Examples of the polyanion include a substituted or unsubstituted polyalkylene, a substituted or unsubstituted polyalkenylene, a substituted or unsubstituted polyimide, a substituted or unsubstituted polyamide, and a substituted or unsubstituted polyester having an anionic group. Examples thereof include a polymer composed only of a structural unit, and a polymer composed of a structural unit having an anionic group and a structural unit not having an anionic group.

A polyalkylene is a polymer whose main chain is composed of repeating methylenes.
Polyalkenylene is a polymer composed of structural units containing one unsaturated double bond (vinyl group) in the main chain.
As polyimide, pyromellitic dianhydride, biphenyltetracarboxylic dianhydride, benzophenonetetracarboxylic dianhydride, 2,2 ′-[4,4′-di (dicarboxyphenyloxy) phenyl] propane dianhydride And polyimides from acid anhydrides such as oxydiamine, paraphenylenediamine, metaphenylenediamine, benzophenonediamine and the like.
Examples of the polyamide include polyamide 6, polyamide 6,6, polyamide 6,10 and the like.
Examples of the polyester include polyethylene terephthalate and polybutylene terephthalate.

  When the polyanion has a substituent, examples of the substituent include an alkyl group, a hydroxy group, an amino group, a carboxy group, a cyano group, a phenyl group, a phenol group, an ester group, and an alkoxy group. In view of solubility in organic solvents, heat resistance, compatibility with resins, and the like, alkyl groups, hydroxy groups, phenol groups, and ester groups are preferred.

Examples of the alkyl group include alkyl groups such as methyl, ethyl, propyl, butyl, isobutyl, t-butyl, pentyl, hexyl, octyl, decyl, and dodecyl, and cycloalkyl groups such as cyclopropyl, cyclopentyl, and cyclohexyl. It is done.
Examples of the hydroxy group include a hydroxy group bonded directly or via another functional group to the main chain of the polyanion. Examples of the other functional group include an alkyl group having 1 to 7 carbon atoms and an alkyl group having 2 to 7 carbon atoms. An alkenyl group, an amide group, an imide group, etc. are mentioned. Hydroxy groups are substituted at the ends or in these functional groups.
Examples of the amino group include an amino group bonded to the main chain of the polyanion directly or via another functional group. Examples of the other functional group include an alkyl group having 1 to 7 carbon atoms and an alkyl group having 2 to 7 carbon atoms. An alkenyl group, an amide group, an imide group, etc. are mentioned. The amino group is substituted at the end or in these functional groups.
Examples of the phenol group include a phenol group bonded directly or via another functional group to the main chain of the polyanion. Examples of the other functional group include an alkyl group having 1 to 7 carbon atoms and an alkyl group having 2 to 7 carbon atoms. An alkenyl group, an amide group, an imide group, etc. are mentioned. The phenol group is substituted at the end or in these functional groups.

Examples of the polyalkylene having a substituent include polyethylene, polypropylene, polybutene, polypentene, polyhexene, polyvinyl alcohol, polyvinylphenol, poly (3,3,3-trifluoropropylene), polyacrylonitrile, polyacrylate, polystyrene and the like. it can.
Specific examples of polyalkenylene include propenylene, 1-methylpropenylene, 1-butylpropenylene, 1-decylpropenylene, 1-cyanopropenylene, 1-phenylpropenylene, 1-hydroxypropenylene, 1-butenylene, 1-methyl-1-butenylene, 1-ethyl-1-butenylene, 1-octyl-1-butenylene, 1-pentadecyl-1-butenylene, 2-methyl-1-butenylene, 2-ethyl-1-butenylene, 2- Butyl-1-butenylene, 2-hexyl-1-butenylene, 2-octyl-1-butenylene, 2-decyl-1-butenylene, 2-dodecyl-1-butenylene, 2-phenyl-1-butenylene, 2-butenylene, 1-methyl-2-butenylene, 1-ethyl-2-butenylene, 1-octyl-2-butenylene 1-pentadecyl-2-butenylene, 2-methyl-2-butenylene, 2-ethyl-2-butenylene, 2-butyl-2-butenylene, 2-hexyl-2-butenylene, 2-octyl-2-butenylene, 2- Decyl-2-butenylene, 2-dodecyl-2-butenylene, 2-phenyl-2-butenylene, 2-propylenephenyl-2-butenylene, 3-methyl-2-butenylene, 3-ethyl-2-butenylene, 3-butyl 2-butenylene, 3-hexyl-2-butenylene, 3-octyl-2-butenylene, 3-decyl-2-butenylene, 3-dodecyl-2-butenylene, 3-phenyl-2-butenylene, 3-propylenephenyl- 2-butenylene, 2-pentenylene, 4-propyl-2-pentenylene, 4-propyl-2-pentenylene, 4- Tyl-2-pentenylene, 4-hexyl-2-pentenylene, 4-cyano-2-pentenylene, 3-methyl-2-pentenylene, 4-ethyl-2-pentenylene, 3-phenyl-2-pentenylene, 4-hydroxy- Examples thereof include polymers containing one or more structural units selected from 2-pentenylene, hexenylene and the like.

Examples of the anion group of the _{^{polyanion, -O-SO 3 - X +}} , -SO 3 - X +, -COO - X + (. X + is the hydrogen ion in each of the formulas, represents an alkali metal ion), and the like. That is, the polyanion is a polymer acid containing a sulfo group and / or a carboxy group. Among these, from the viewpoint of doping effects on the π-conjugated conductive _{^{polymer, -SO 3 - X +, -COO}} - X + are preferable.
Moreover, it is preferable that this anion group is arrange | positioned in the principal chain of a polyanion adjacently or at fixed intervals.

  Among the polyanions, polyisoprene sulfonic acid, a copolymer containing polyisoprene sulfonic acid, a polysulfoethyl methacrylate, a copolymer containing polysulfoethyl methacrylate, and poly (4-sulfone) are preferable in view of solvent solubility and conductivity. Butyl methacrylate), a copolymer containing poly (4-sulfobutyl methacrylate), a polymethacryloxybenzenesulfonic acid, a copolymer containing polymethacryloxybenzenesulfonic acid, a polystyrenesulfonic acid, a copolymer containing polystyrenesulfonic acid, etc. Is preferred.

  The degree of polymerization of the polyanion is preferably in the range of 10 to 100,000 monomer units, and more preferably in the range of 50 to 10,000 from the viewpoint of solvent solubility and conductivity.

  The content of the polyanion is preferably in the range of 0.1 to 10 mol, and more preferably in the range of 1 to 7 mol, with respect to 1 mol of the π-conjugated conductive polymer. When the polyanion content is less than 0.1 mol, the doping effect on the π-conjugated conductive polymer tends to be weakened, and the conductivity may be insufficient. In addition, the dispersibility and solubility in the solvent are reduced, making it difficult to obtain a uniform dispersion. On the other hand, when the polyanion content is more than 10 mol, the content of the π-conjugated conductive polymer decreases, and it is difficult to obtain sufficient conductivity.

The polyanion is coordinated to the π-conjugated conductive polymer. Therefore, the π-conjugated conductive polymer and the polyanion form a complex.
The total content of the π-conjugated conductive polymer and the polyanion is 0.05 to 5.0% by mass, and preferably 0.1 to 4.0% by mass. When the total content of the π-conjugated conductive polymer and the polyanion is less than 0.05% by mass, sufficient conductivity may not be obtained, and when it exceeds 5.0% by mass, a uniform first The transparent electrode 12 may not be obtained.

[Metal nanoparticles]
Metal nanoparticles are metal particles having an average particle diameter of 1 to 50 nm. Metal nanoparticles having an average particle size of less than 1 nm are difficult to prepare, and if it exceeds 50 nm, it is difficult to maintain a colloidal state in the conductive polymer solution used when forming the first transparent electrode 12. .
In the present invention, the metal forming the metal nanoparticles is one or more metals selected from the group consisting of silver, gold, nickel, copper, platinum, palladium, and indium, or alloys thereof. With other metals or alloys, it is difficult to form colloidal particles.
Examples of the alloy that can be used for the metal nanoparticles include an alloy obtained by simultaneously adding an aqueous solution of two or more kinds of metal salts to an aqueous solution in which a reducing agent is dissolved. As the metal salt, chlorides such as silver, gold, nickel, copper, platinum, palladium and indium, nitrates or metal complex compounds can be used.
These alloys may be used alone or in combination of two or more.

  The content of the metal nanoparticles is 0.01% by mass or more and less than 5.0% by mass with respect to a total of 100% by mass of the π-conjugated conductive polymer and the polyanion, and 0.05 to 4.0% by mass. Preferably there is. If the content of the metal nanoparticles is less than 0.01% by mass, the contact resistance in the different conductor contact may not be sufficiently lowered and may cause malfunction, and if it exceeds 5.0% by mass, the first transparent The transparency of the electrode 12 may be lowered.

[Acrylic polymer]
The first transparent electrode 12 preferably contains an acrylic polymer from the viewpoint of improving film formability. Here, the acrylic polymer is a polymer obtained by polymerizing at least one monomer selected from the group consisting of the following monomer (a) and monomer (b).

(A) An acrylic monomer having a glycidyl group (hereinafter referred to as monomer (a)).
(B) An acrylic monomer having one type selected from an allyl group, a vinyl ether group, a methacryl group, an acrylic group, a methacrylamide group, and an acrylamide group and a hydroxy group (hereinafter referred to as monomer (b)).

Furthermore, examples of the monomer (a) include the following acrylic monomers (a-1) to (a-3).
(A-1): An acrylic monomer having a glycidyl group and one kind selected from an allyl group, a vinyl ether group, a methacryl group, an acrylic group, a methacrylamide group, and an acrylamide group.
(A-2): An acrylic monomer having two or more glycidyl groups.
(A-3): A monomer other than the monomer (a-1), which is an acrylic monomer having one glycidyl group.

Among the monomers (a-1), examples of the monomer having a glycidyl group and an acrylic (methacrylic) group include glycidyl acrylate and glycidyl methacrylate.
Examples of the monomer having a glycidyl group and an allyl group include allyl glycidyl ether, 2-methylallyl glycidyl ether, and allylphenol glycidyl ether.
Examples of the monomer having a glycidyl group and a hydroxy group include 1,4-dihydroxymethylbenzene diglycidyl ether and glycerin diglycidyl ether.
Examples of the monomer having a glycidyl group, a hydroxy group, and an allyl group include 3-allyl-1,4-dihydroxymethylbenzene diglycidyl ether.
The monomer having a glycidyl group and a hydroxy group, and the monomer having a glycidyl group, a hydroxy group, and an allyl group are also the monomer (b).

  Examples of the monomer (a-2) include ethylene glycol diglycidyl ether, diethylene glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane triglycidyl ether, bisphenol A diglycidyl ether, polyethylene glycol diester. Glycidyl ether, propylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, dimer acid diglycidyl ester, phthalic acid diglycidyl ester, triglycidyl isocyanurate, tetraglycidyl diaminodiphenylmethane, diglycidyl tetraphthalate, etc. It can be used, and can be used as a mixture of one type or two or more types.

  Examples of the monomer (a-3) include alkyl glycidyl ether, ethylene glycol glycidyl ether, methyl glycidyl ether, phenyl glycidyl ether, butylphenyl glycidyl ether, and cresyl glycidyl ether.

Among the monomers (b), examples of the monomer having a hydroxy group and a vinyl ether group include 2-hydroxyethyl vinyl ether, 4-hydroxybutyl vinyl ether, diethylene glycol monovinyl ether, and the like.
As monomers having a hydroxy group and an acrylic (methacrylic) group, 2-hydroxyethyl acrylate (methacrylate), 2-hydroxypropyl acrylate (methacrylate), 4-hydroxybutyl acrylate (methacrylate), ethyl-α-hydroxymethyl acrylate, Examples include dipentaerythritol monohydroxypentaacrylate.
Examples of monomers having a hydroxy group and an acrylamide (methacrylamide) group include 2-hydroxyethyl acrylamide and 2-hydroxyethyl methacrylamide.

In the monomer (a), the glycidyl group reacts with the remaining anion group (eg, sulfo group, carboxy group, etc.) of the polyanion to form an ester (eg, sulfonate ester, carboxylate ester, etc.). In the reaction, the reaction may be promoted by a basic catalyst, pressurization, or heating. During ester formation, the glycidyl group opens to form a hydroxy group. This hydroxy group causes a dehydration reaction with the remaining anionic group that did not form a salt or ester with the π-conjugated conductive polymer to form a new ester (for example, sulfonate ester, carboxylate ester, etc.) To do. By forming such an ester, the complex of the polyanion dopant and the π-conjugated conductive polymer is cross-linked.
Furthermore, in the monomer (a-1), after the remaining anion group of the polyanion is bonded to the glycidyl group of the monomer (a-1), the allyl group and vinyl ether of the monomer (a-1) are combined. Groups, methacrylic groups, acrylic groups, methacrylamide groups, and acrylamide groups are polymerized to further crosslink the composites.

  In the monomer (b), the hydroxy group dehydrates with the remaining anion group of the polyanion to form an ester. In the dehydration reaction, the reaction may be promoted by an acidic catalyst. Thereafter, the allyl group, vinyl ether group, methacryl group, acrylic group, methacrylamide group, and acrylamide group of the monomer (b) are polymerized. By this polymerization, the complex of the polyanion and the conductive polymer is cross-linked.

  Among the acrylic monomers, (meth) acrylamide is preferable. The (meth) acrylamide polymer has good compatibility between the π-conjugated conductive polymer and the polyanion complex, and can further improve the conductivity.

The acrylic polymer may be copolymerized with a polyfunctional acrylic monomer having two or more unsaturated double bonds. If the polyfunctional acrylic monomer is copolymerized, the complex of the π-conjugated conductive polymer and the polyanion is easily cross-linked, and the conductivity and coating strength are further improved.
Specific examples of the polyfunctional acrylic monomer include dipropylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, tripropylene glycol di (meth) acrylate, and modified bisphenol A di (meth) acrylate. , Dimethylol dicyclopentadi (meth) acrylate, polyethylene glycol (hereinafter referred to as PEG) 400 di (meth) acrylate, PEG300 di (meth) acrylate, PEG600 di (meth) acrylate, N, N′-methylene Bifunctional acrylic monomers such as bisacrylamide, trimethylolpropane tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, trimethylolpropane ethoxytri (meth) acrylate, glycerin propoxytri ( Trifunctional acrylic monomers such as (meth) acrylate, pentaerythritol tri (meth) acrylate, ethoxylated glycerin triacrylate, pentaerythritol ethoxytetra (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, pentaerythritol tetra (meth) acrylate, A tetrafunctional or higher functional acrylic monomer such as dipentaerythritol hexa (penta) (meth) acrylate or dipentaerythritol monohydroxypenta (meth) acrylate, a pentafunctional or higher acrylic monomer such as sorbitol pentaacrylate or dipentaerythritol pentaacrylate, di Pentaerythritol hexaacrylate, sorbitol hexaacrylate, alkylene oxide modified hexaacrylate, Caprolactone-modified dipentaerythritol 6 or more functional acrylic monomers hexaacrylate, bifunctional or higher functional urethane acrylate.

Among the polyfunctional acrylic monomers, the bifunctional or higher acrylic monomer preferably has a molecular weight of 3000 or less. When the molecular weight of the bifunctional or higher acrylic monomer exceeds 3000, the bifunctional or higher functional acrylic monomer is difficult to dissolve in the conductive polymer solution used when forming the first transparent electrode 12. In addition, since the unsaturated double bond equivalent is reduced, it is difficult to crosslink the composite, and sufficient strength cannot be obtained.
Of the polyfunctional acrylic compounds, the polyfunctional urethane acrylate preferably has a molecular weight of 1000 or less in terms of solvent solubility, wear resistance, and low shrinkage. In the polyfunctional urethane acrylate having a molecular weight exceeding 1000, the introduction rate of the urethane group formed by the isocyanate group and the polyol (hydroxyl group) decreases, and the solubility in the solvent tends to be low.

  The content of the acrylic polymer is preferably 0.05 to 50% by mass and more preferably 0.3 to 30% by mass with respect to 100% by mass in total of the π-conjugated conductive polymer and the polyanion. preferable. When the content of the acrylic polymer is less than 0.05% by mass, the film formability may be insufficient. When the content is more than 50% by mass, the content of the π-conjugated conductive polymer is reduced and sufficient. Conductivity may not be obtained.

(Aromatic compounds having two or more hydroxy groups)
Moreover, since the 1st transparent electrode 12 becomes higher electroconductivity, it is preferable to contain the aromatic compound which has a 2 or more hydroxy group.
Examples of aromatic compounds having two or more hydroxy groups include 1,4-dihydroxybenzene, 1,3-dihydroxybenzene, 2,3-dihydroxy-1-pentadecylbenzene, 2,4-dihydroxyacetophenone, 2,5 -Dihydroxyacetophenone, 2,4-dihydroxybenzophenone, 2,6-dihydroxybenzophenone, 3,4-dihydroxybenzophenone, 3,5-dihydroxybenzophenone, 2,4'-dihydroxydiphenylsulfone, 2,2 ', 5,5' -Tetrahydroxydiphenylsulfone, 3,3 ', 5,5'-tetramethyl-4,4'-dihydroxydiphenylsulfone, hydroxyquinone carboxylic acid and its salts, 2,3-dihydroxybenzoic acid, 2,4-dihydroxybenzoic acid Acid, 2,5-dihydroxy Benzoic acid, 2,6-dihydroxybenzoic acid, 3,5-dihydroxybenzoic acid, 1,4-hydroquinonesulfonic acid and its salts, 4,5-hydroxybenzene-1,3-disulfonic acid and its salts, 1,5 -Dihydroxynaphthalene, 1,6-dihydroxynaphthalene, 2,6-dihydroxynaphthalene, 2,7-dihydroxynaphthalene, 2,3-dihydroxynaphthalene, 1,5-dihydroxynaphthalene-2,6-dicarboxylic acid, 1,6- Dihydroxynaphthalene-2,5-dicarboxylic acid, 1,5-dihydroxynaphthoic acid, 1,4-dihydroxy-2-naphthoic acid phenyl ester, 4,5-dihydroxynaphthalene-2,7-disulfonic acid and salts thereof, 1, 8-dihydroxy-3,6-naphthalenedisulfonic acid and its salts, 6 7-dihydroxy-2-naphthalenesulfonic acid and its salts, 1,2,3-trihydroxybenzene (pyrogallol), 1,2,4-trihydroxybenzene, 5-methyl-1,2,3-trihydroxybenzene, 5-ethyl-1,2,3-trihydroxybenzene, 5-propyl-1,2,3-trihydroxybenzene, trihydroxybenzoic acid, trihydroxyacetophenone, trihydroxybenzophenone, trihydroxybenzaldehyde, trihydroxyanthraquinone, Examples include 2,4,6-trihydroxybenzene, tetrahydroxy-p-benzoquinone, tetrahydroxyanthraquinone, methyl garlic acid (methyl gallate), and ethyl garlic acid (ethyl gallate).
Some of these aromatic compounds also function as a reducing agent. Therefore, the electrical conductivity can be further increased by using an aromatic compound having two or more hydroxy groups as a reducing agent.

  The content of the aromatic compound having two or more hydroxy groups is preferably in the range of 0.05 to 50 mol, more preferably in the range of 0.3 to 10 mol with respect to 1 mol of the anion group unit of the polyanion. It is more preferable. If the content of the aromatic compound having two or more hydroxy groups is less than 0.05 mol relative to 1 mol of the anion group unit of the polyanion, the conductivity may not be increased. In addition, when the content of the compound having two or more hydroxy groups is more than 50 mol with respect to 1 mol of the anion group unit of the polyanion, the content of the π-conjugated conductive polymer in the first transparent electrode 12 In some cases, sufficient conductivity may not be obtained.

[Additive]
The 1st transparent electrode 12 may contain an additive as needed.
The additive is not particularly limited as long as it can be mixed with a π-conjugated conductive polymer and a polyanion. For example, an alkaline compound, a surfactant, an antifoaming agent, a coupling agent, an antioxidant, and an ultraviolet absorber. Etc. can be used.
As the alkaline compound, known inorganic alkali compounds and organic alkali compounds can be used. Examples of the inorganic alkali compound include sodium hydroxide, potassium hydroxide, calcium hydroxide, ammonia and the like.
Examples of the organic alkali compound include aliphatic amines, aromatic amines, quaternary amines, nitrogen-containing compounds other than amines, metal alkoxides, and dimethyl sulfoxide. Among these, one or two or more selected from the group consisting of aliphatic amines, aromatic amines, and quaternary amines are preferable because of higher conductivity.
Surfactants include anionic surfactants such as carboxylates, sulfonates, sulfates and phosphates; cationic surfactants such as amine salts and quaternary ammonium salts; carboxybetaines and aminocarboxylics Examples include amphoteric surfactants such as acid salts and imidazolium betaines; nonionic surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene glycerin fatty acid esters, ethylene glycol fatty acid esters, and polyoxyethylene fatty acid amides.
Examples of the antifoaming agent include silicone resin, polydimethylsiloxane, and silicone resin.
Examples of the coupling agent include silane coupling agents having a vinyl group, an amino group, an epoxy group, and the like.
Examples of the antioxidant include phenolic antioxidants, amine antioxidants, phosphorus antioxidants, sulfur antioxidants, saccharides, vitamins and the like.
Examples of UV absorbers include benzotriazole UV absorbers, benzophenone UV absorbers, salicylate UV absorbers, cyanoacrylate UV absorbers, oxanilide UV absorbers, hindered amine UV absorbers, and benzoate UV absorbers. Is mentioned.
It is preferable to use an antioxidant and an ultraviolet absorber in combination.

[thickness]
The thickness of the first transparent electrode 12 is preferably 50 to 700 μm. If the thickness of the 1st transparent electrode 12 is 50 micrometers or more, sufficient electroconductivity can be ensured, and if it is 700 micrometers or less, sufficient flexibility and transparency can be ensured.

(Production method of movable electrode sheet)
The movable electrode sheet 10 is produced by applying a conductive polymer solution on the first transparent substrate 11.
Here, the conductive polymer solution contains a π-conjugated conductive polymer, a polyanion, metal nanoparticles, and a solvent as essential components, an aromatic compound having two or more hydroxy groups, an acrylic monomer, Additives and the like are included as optional components.

The solvent is not particularly limited, and examples thereof include water, alcohols such as methanol, ethanol, propanol and butanol, carbonate compounds such as ethylene carbonate and propylene carbonate, phenols such as cresol, phenol and xylenol, and ketones such as acetone and methyl ethyl ketone. , Hydrocarbons such as hexane, benzene, toluene, ether compounds such as dioxane, 2-methyltetrahydrofuran, diethyl ether, nitrile compounds such as acetonitrile, glutaronitrile, methoxyacetonitrile, propionitrile, benzonitrile, N, N -Dimethylformamide, N, N-dimethylacetamide, N-methyl-2-pyrrolidone, hexamethylene phosphortriamide, 1,3-dimethyl-2-imidazolidine, di Chill imidazoline, ethyl acetate, dimethyl sulfoxide, sulfolane, and the like diphenyl sulfonic acid. These solvents may be used alone, as a mixture of two or more kinds, or as a mixture with other organic solvents.
Among the solvents, water and alcohols are preferable from the viewpoint of handleability.

  The conductive polymer solution is prepared, for example, by conducting chemical oxidative polymerization of a precursor monomer of a π-conjugated conductive polymer in an aqueous solution of polyanion to prepare a conductive polymer aqueous solution. Colloidal particles) and optional components as necessary.

Since metal nanoparticles have a small particle size, they have a large surface energy and are likely to aggregate. For this reason, it is preferable to add a dispersant for suppressing aggregation to the metal nanoparticles to form a colloid to improve the dispersion stability.
As the dispersant, a dispersant having a functional group having a strong adsorptive power to the metal nanoparticle surface is used. Specific examples include citric acid and its derivatives, aniline and its derivatives, sulfur compounds, nitrogen compounds and the like.
Moreover, as a sulfur compound, thiols (for example, acid thiols, aliphatic thiols, alicyclic thiols, aromatic thiols, etc.), thioglycols, thioamides, dithiols, thiols, thiones, Examples include polythiols, thiocarbonates, thioureas, hydrogen sulfide, and derivatives thereof.
Examples of the nitrogen compound include a tertiary amino group, a quaternary amino group, a heterocyclic compound having a basic nitrogen atom, and the like.
It is preferable that the addition amount of a dispersing agent is 1-200 mass% with respect to 100 mass% of metal nanoparticles. If the amount of the dispersant added is 1% by mass or more, the metal nanoparticles can be reliably dispersed. However, even if added over 200% by mass, the effect of improving dispersibility does not increase, so only the cost is increased.

  As a method for applying the conductive polymer solution, for example, comma coating, reverse coating, lip coating, micro gravure coating, or the like is applied.

In the case of containing an acrylic monomer, it is preferable to apply a curing treatment for obtaining an acrylic polymer by polymerizing the acrylic monomer after applying the conductive polymer solution.
In the polymerization of the acrylic monomer, a thermal radical polymerization method, a photo radical polymerization method, a plasma polymerization method, and a cationic polymerization method can be applied.
In the thermal radical polymerization method, polymerization is performed using, for example, an azo compound such as azobisisobutyronitrile, a peroxide such as benzoyl peroxide, diacyl peroxides, peroxyesters, and hydroperoxides as a polymerization initiator. In the case of applying the thermal radical polymerization method, polymerization may be performed by heating with hot air heating or infrared heating.
In the photo radical polymerization method, polymerization is performed using a carbonyl compound, a sulfur compound, an organic peroxide, an azo compound, or the like as a polymerization initiator. Specifically, benzophenone, Michler's ketone, xanthone, thioxanthone, 2-ethylanthraquinone, acetophenone, trichloroacetophenone, 2-hydroxy-2-methyl-propiophenone, 1-hydroxycyclohexyl phenyl ketone, benzoin ether, 2,2-di Ethoxyacetophenone, 2,2-dimethoxy-2-phenylacetophenone, benzyl, methylbenzoylformate, 1-phenyl-1,2-propanedione-2- (o-benzoyl) oxime, 2,4,6-trimethylbenzoyldiphenyl Examples include phosphine oxide, tetramethylthiuram, dithiocarbamate, benzoyl peroxide, N-laurylpyridium azide, and polymethylphenylsilane.
When the photo radical polymerization method is applied, for example, polymerization may be performed by irradiating ultraviolet rays from a light source such as an ultrahigh pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc, a xenon arc, or a metal halide lamp. Moreover, you may heat-dry before irradiating with an ultraviolet-ray.
In plasma polymerization, plasma is irradiated for a short time, receives energy from electron bombardment of the plasma, performs fragmentation and rearrangement, and then generates a polymer by recombination of radicals.
In the cationic polymerization method, an electrophilic reagent that generates a cation with light or heat, such as a Lewis acid such as a metal halide or an organometallic compound, or a halogen, a strong acid salt, or a carbonium ion salt is used to promote the reaction. The cationic polymerization method is applied to the polymerization of a monomer (b) in which an acrylic monomer has a monomer (a-1) and a vinyl ether group.

<Fixed electrode sheet>
(Second transparent substrate)
As the 2nd transparent base material 21 which comprises the fixed electrode sheet 20, the thing similar to the 1st transparent base material 11 can be used, and it is easy to support the movable electrode sheet 10 via the dot spacer 30 especially. Therefore, a glass plate is preferably used.
The thickness of the second transparent substrate 21 is preferably 0.8 to 2.5 mm. If the thickness of the second transparent substrate 21 is 0.8 mm or more, sufficient strength can be ensured, and if it is 2.5 mm or less, the thickness can be reduced and space saving can be realized.

(Second transparent electrode)
The second transparent electrode 22 is made of a transparent conductive metal oxide. Examples of the transparent conductive metal oxide constituting the second transparent electrode 22 include indium oxide, tin oxide, indium doped tin oxide (ITO), antimony doped tin oxide (ATO), fluorine doped tin oxide (FTO), Examples thereof include aluminum-doped zinc oxide (AZO) and zinc oxide.
The thickness of the second transparent electrode 22 is preferably 0.01 to 1.0 μm. If the thickness of the 2nd transparent electrode 22 is 0.01 micrometer or more, sufficient electroconductivity can be ensured, and if it is 1.0 micrometer or less, it can be made thin and space saving can be implement | achieved.

<Distance between movable electrode sheet and fixed electrode sheet>
It is preferable that the space | interval at the time of the non-pressing of the movable electrode sheet 10 and the fixed electrode sheet 20 is 20-100 micrometers. If the distance between the movable electrode sheet 10 and the fixed electrode sheet 20 when not pressed is 20 μm or more, the movable electrode sheet 10 and the fixed electrode sheet 20 can be reliably prevented from contacting each other when not pressed, and the distance is 100 μm or less. If it exists, the movable electrode sheet 10 and the fixed electrode sheet 20 can be reliably brought into contact at the time of pressing. In order to achieve the interval, the size of the dot spacer 30 may be selected as appropriate.

<Use and use of input devices>
In this input device 1, when the movable electrode sheet 10 is pushed by a finger or a stylus, the first transparent electrode 12 of the movable electrode sheet 10 and the second transparent electrode 22 of the fixed electrode sheet 20 are brought into contact with each other to be conducted. The position is detected by taking in the voltage at that time.
Such an input device 1 is provided in, for example, an electronic notebook, a personal digital assistant (PDA), a mobile phone, a PHS, an automatic teller machine (ATM), a vending machine, a point-of-sale information management (POS) register, and the like. It is done.

<Effect>
In the input device 1 described above, since the first transparent electrode 12 constituting the movable electrode sheet 10 contains metal nanoparticles, the second transparent device made of a transparent conductive metal oxide has excellent conductivity. The contact resistance with respect to the electrode 22 is small. Therefore, malfunctions such as a decrease in input sensitivity and a delay in coordinate input time are unlikely to occur.
Moreover, since the metal nanoparticles are dispersed with high dispersibility in the conductive polymer solution for forming the first transparent electrode 12, the metal nanoparticles are uniformly contained in the first transparent electrode 12. Therefore, it is difficult for malfunction to occur on the entire surface of the first transparent electrode.
Further, since the content of the metal nanoparticles is as small as less than 5% by mass with respect to 100% by mass in total of the π-conjugated conductive polymer and the polyanion, transparency is not impaired by the metal nanoparticles. Therefore, when the input device 1 is installed on the image display device, the image visibility is excellent.

Examples of the present invention will be specifically described below, but the present invention is not limited to the examples.
(Production Example 1) Preparation of polystyrene sulfonic acid 206 g of sodium styrene sulfonate was dissolved in 1000 ml of ion-exchanged water, and 1.14 g of ammonium persulfate oxidizing agent solution previously dissolved in 10 ml of water was stirred at 80 ° C. The solution was added dropwise for 20 minutes, and the solution was stirred for 2 hours.
1000 ml and 10,000 ml of ion-exchanged water diluted with 10% by mass of sulfuric acid diluted to 10% by mass were added to the sodium styrenesulfonate-containing solution thus obtained, and about 10,000 ml of the polystyrenesulfonic acid-containing solution was removed using an ultrafiltration method. Then, 10,000 ml of ion-exchanged water was added to the remaining liquid, and about 10,000 ml of solution was removed using an ultrafiltration method. The above ultrafiltration operation was repeated three times.
Furthermore, about 10,000 ml of ion-exchanged water was added to the obtained filtrate, and about 10,000 ml of solution was removed using an ultrafiltration method. This ultrafiltration operation was repeated three times.
The ultrafiltration conditions were as follows (the same applies to other examples).
Molecular weight cut off of ultrafiltration membrane: 30000
Cross flow type Supply liquid flow rate: 3000 ml / min Membrane partial pressure: 0.12 Pa
Water in the obtained solution was removed under reduced pressure to obtain colorless solid polystyrene sulfonic acid.

(Production Example 2) Preparation of Polystyrenesulfonic Acid Doped Poly (3,4-ethylenedioxythiophene) Aqueous Solution 14.2 g of 3,4-ethylenedioxythiophene and 36.7 g of polystyrenesulfonic acid obtained in Production Example 1 A solution dissolved in 2000 ml of ion-exchanged water was mixed at 20 ° C.
While maintaining the mixed solution thus obtained at 20 ° C. and stirring, 29.64 g of ammonium persulfate dissolved in 200 ml of ion exchange water and 8.0 g of ferric sulfate oxidation catalyst solution were slowly added, The reaction was stirred for 3 hours.
2000 ml of ion-exchanged water was added to the resulting reaction solution, and about 2000 ml of solution was removed using an ultrafiltration method. This operation was repeated three times.
Then, 200 ml of sulfuric acid diluted to 10% by mass and 2000 ml of ion-exchanged water are added to the treatment liquid that has been subjected to the filtration treatment, and about 2000 ml of the treatment liquid is removed using an ultrafiltration method. Ion exchange water was added and about 2000 ml of liquid was removed using ultrafiltration. This operation was repeated three times.
Furthermore, 2000 ml of ion-exchanged water was added to the obtained treatment liquid, and about 2000 ml of the treatment liquid was removed using an ultrafiltration method. This operation was repeated five times to obtain about 1.2% by mass of a blue polystyrenesulfonic acid-doped poly (3,4-ethylenedioxythiophene) (PEDOT-PSS) aqueous solution.

Example 1
27.0 g of gold-silver colloidal particles (Sumitomo Metal Mining Co., Ltd., CKR series, alcohol dispersion, concentration 1.2% by mass) (gold-silver colloid with respect to 100% by mass of π-conjugated conductive polymer and polyanion in total) Particles are 4.50% by mass), hydroquinone 3.6 g, Irgacure 127 (manufactured by Ciba Specialty Chemicals) 0.9 g, 2-hydroxyethylacrylamide 18 g, pentaerythritol triacrylate 7.2 g, and ethanol 300 g are mixed, Stir. To this mixed solution, 600 g of the PEDOT-PSS aqueous solution obtained in Production Example 2 was added, and homogenizer dispersion treatment was performed to obtain a conductive polymer solution A.
The conductive polymer solution A is reversely applied to a polyethylene terephthalate film (Toyobo A4300, thickness: 188 μm, total light transmittance: 93.5%, haze: 0.68%) as a first transparent substrate. After coating with a coater, drying at 120 ° C. for 2 minutes with hot air, irradiation with ultraviolet rays (high pressure mercury lamp 120 W, 360 mJ / cm ² , 178 mW / cm ² ) and curing to form a first transparent substrate, An electrode sheet was obtained.
The surface resistance and light transmittance of the first transparent electrode, and the contact resistance between the first transparent electrode and the second transparent electrode in the input device were measured by the following methods. The results are shown in Table 1.

[Surface resistance value]
Measurement was performed according to JIS K 7194 using a Loresta MCP-T600 manufactured by Mitsubishi Chemical Corporation.
[Light transmittance]
The light transmittance was measured according to JIS K7136 using a Nippon Denshoku Industries Co., Ltd. haze meter measuring device (NDH5000).
[Contact resistance]
A conductive polymer solution was applied on the first transparent substrate 11 (polyethylene terephthalate film, Toyobo A4300, thickness: 188 μm) to form the first transparent electrode 12, which was cut into 40 mm × 50 mm. . A conductive paste (FA-401CA manufactured by Fujikura Kasei Co., Ltd.) is screen printed on the edge of the cut sheet on the first transparent electrode 12 in the width direction and dried to form electrode wirings 13a and 13b. A movable electrode sheet 10 on the side (see FIG. 2) was obtained.
Moreover, the 2nd transparent electrode 22 (surface resistance: 300 (ohm)) made from ITO was provided in the single side | surface of the glass-made 2nd transparent base material 21, and the sheet | seat for electrodes cut | judged by 40 mm x 50 mm was prepared. A conductive paste (XA436 manufactured by Fujikura Kasei Co., Ltd.) was screen-printed on the edge of the prepared electrode sheet on the second transparent electrode 22 in the longitudinal direction and dried to form electrode wirings 23a and 23b. Next, a dot spacer paste (SN-8400C manufactured by Fujikura Kasei Co., Ltd.) was screen-printed on the second transparent electrode 22, dried, and irradiated with ultraviolet rays to form the dot spacer 30. Next, a resist paste (SN-8800G manufactured by Fujikura Kasei Co., Ltd.) was screen-printed on the electrode wirings 23a and 23b, dried, and irradiated with UV to form the insulating layer 25. Further, an adhesive (XB-114 manufactured by Fujikura Kasei Co., Ltd.) was screen-printed on the insulating layer 25 and dried to form an adhesive layer 26 for bonding to the movable electrode sheet 10. Thereby, the fixed electrode sheet 20 (refer FIG. 3) for image display apparatuses was obtained.
Next, as shown in FIG. 4, the movable electrode sheet 10 and the fixed electrode sheet 20 are arranged so that the first transparent electrode 12 and the second transparent electrode 22 face each other, and are bonded together by an adhesive layer 26. A resistive touch panel module was produced. In addition, one electrode wiring 23 a of the fixed electrode sheet 20 and the precision power source 31 are connected to a pull-up resistor (82.3 kΩ) 32 and a pull-up resistor 32 in parallel with a voltage measurement tester 33 for the pull-up resistor 32. Electrically connected. The precision power supply 31 and one electrode wiring 13a of the movable electrode sheet 10 were electrically connected. In addition, the other electrode wiring 13b of the movable electrode sheet 10 and the other electrode wiring 23b of the fixed electrode sheet 20 were electrically connected via a voltage measurement tester 34 of a resistive film type touch panel module. Thereby, an electrical circuit for contact resistance measurement was obtained.
The contact resistance was measured as follows. With a polyacetal stylus 35 with a tip of 0.8R, the movable electrode sheet 10 is pressed with a load of 250 g, and the voltage of the pull-up resistor and the voltage of the resistive touch panel module when a voltage of 5 V is applied by the precision power supply 31 are measured. And contact resistance was measured from these measurement results.
Specifically, the current value flowing through the pull-up resistor 32 is calculated from Ohm's law using the measured voltage value, and the calculated current value and the voltage value of the resistive touch panel module are substituted into the following equation. Contact resistance was determined.
Contact resistance (Ω) = [(resistance film type touch panel module voltage (V)) / (pull-up resistance voltage (V))] × pull-up resistance (Ω)
[Sliding test]
In order to measure the coating strength of the first transparent electrode, Kimwipe (manufactured by Nippon Paper Crecia Co., Ltd.) moistened with ethanol was rubbed 30 times with a load of 100 gf / cm ² to remove the first transparent electrode. Inspected visually. Further, the contact resistance after the sliding test was measured. These results serve as an index of the film strength of the first transparent electrode.
◎: No peeling, ○: Slight peeling, △: Partial peeling, ×: Complete peeling

(Example 2)
0.57 g of silver colloid particles (manufactured by Nanosize, AG321, ethylene glycol dispersion, concentration 50% by mass) (4.0% by mass of silver colloid particles with respect to 100% by mass in total of π-conjugated conductive polymer and polyanion) ), Irgacure 127 (Ciba Specialty Chemicals Co., Ltd.) 0.9 g, 2,3,3 ′, 4,4 ′, 5-hexahydroxybenzophenone 3.6 g, 2-hydroxyethylacrylamide 18 g, tripropylene glycol diacrylate 7.2 g and 300 g of ethanol were mixed and stirred. To this mixed solution, 600 g of the PEDOT-PSS aqueous solution obtained in Production Example 2 was added and subjected to a homogenizer dispersion treatment to obtain a conductive polymer solution B.
Then, a first transparent electrode was formed and evaluated in the same manner as in Example 1 except that the conductive polymer solution B was used instead of the conductive polymer solution A. The evaluation results are shown in Table 1.

(Example 3)
10 g of silver colloid particles (Sumitomo Metal Mining Co., Ltd., DCG series, alcohol dispersion, concentration 0.3 mass%) (0.42 mass of silver colloid particles with respect to 100 mass% in total of π-conjugated conductive polymer and polyanion) %), Irgacure 127 (manufactured by Ciba Specialty Chemicals) 0.9 g, 2,3,3 ′, 4,4 ′, 5-hexahydroxybenzophenone 3.6 g, 2-hydroxyethylacrylamide 18 g, dipentaerythritol hexa 7.2 g of acrylate and 300 g of ethanol were mixed and stirred. To this mixed solution, 600 g of the PEDOT-PSS aqueous solution obtained in Production Example 2 was added and subjected to a homogenizer dispersion treatment to obtain a conductive polymer solution C.
Then, a first transparent electrode was formed and evaluated in the same manner as in Example 1 except that the conductive polymer solution C was used instead of the conductive polymer solution A. The evaluation results are shown in Table 1.

Example 4
Colloidal silver sol (manufactured by Kyoritsu Material Co., Ltd., SG-AG47SH, concentration 12% by mass) 0.03 g (the colloidal silver sol is 0.05% by mass with respect to a total of 100% by mass of the π-conjugated conductive polymer and the polyanion), 0.9 g of Irgacure 127 (manufactured by Ciba Specialty Chemicals), 3.6 g of hydroquinone, 18 g of 2-hydroxyethylacrylamide, 7.2 g of ditrimethylolpropane tetraacrylate, and 300 g of ethanol were mixed and stirred. To this mixed solution, 600 g of the PEDOT-PSS aqueous solution obtained in Production Example 2 was added and subjected to a homogenizer dispersion treatment to obtain a conductive polymer solution D.
Then, a first transparent electrode was formed and evaluated in the same manner as in Example 1 except that the conductive polymer solution D was used instead of the conductive polymer solution A. The evaluation results are shown in Table 1.

(Example 5)
A conductive polymer solution E was obtained in the same manner as in Example 1 except that 20 g of dimethyl sulfoxide was added instead of 18 g of 2-hydroxyethylacrylamide in Example 1 and pentaerythritol triacrylate was not added. Then, a first transparent electrode was formed and evaluated in the same manner as in Example 1 except that the conductive polymer solution E was used instead of the conductive polymer solution A. The evaluation results are shown in Table 1.

(Example 6)
A conductive polymer solution F was obtained in the same manner as in Example 3 except that dipentaerythritol hexaacrylate was not added in Example 3. Then, a first transparent electrode was formed and evaluated in the same manner as in Example 1 except that the conductive polymer solution F was used instead of the conductive polymer solution A. The evaluation results are shown in Table 1.

(Example 7)
Colloidal copper paste (manufactured by Kyoritsu Materials Co., Ltd., SG-CU50P, concentration 60 mass%) 0.3 g (colloidal copper is 2.50 mass% with respect to 100 mass% in total of π-conjugated conductive polymer and polyanion), Irgacure 127 g (manufactured by Ciba Specialty Chemicals) 0.9 g, 3.6 g garlic acid, 18 g 2-hydroxyethylacrylamide, 7.2 g dipentaerythritol monohydroxypentaacrylate, 200 g 1-methoxy-2-propanol, Stir. To the mixed solution thus obtained, 600 g of the PEDOT-PSS aqueous solution obtained in Production Example 2 was added and subjected to a homogenizer dispersion treatment to obtain a conductive polymer solution G.
Then, a first transparent electrode was formed and evaluated in the same manner as in Example 1 except that the conductive polymer solution G was used instead of the conductive polymer solution A. The evaluation results are shown in Table 1.

(Example 8)
Indium colloid (manufactured by Shinko Chemical Industry Co., Ltd., concentration: 1.4% by mass) 5.6 g (indium colloid is 1.09% by mass based on 100% by mass of the π-conjugated conductive polymer and polyanion), Irgacure 127 (Ciba Specialty Chemicals) 0.9g, methyl garlic acid 3.6g, 2-hydroxyethyl acrylamide 18g, dimethylol dicyclopentadiacrylate 7.2g, 1-methoxy-2-propanol 200g, Stir. To the mixed solution thus obtained, 600 g of the PEDOT-PSS aqueous solution obtained in Production Example 2 was added and subjected to a homogenizer dispersion treatment to obtain a conductive polymer solution H.
Then, a first transparent electrode was formed and evaluated in the same manner as in Example 1 except that the conductive polymer solution H was used instead of the conductive polymer solution A. The evaluation results are shown in Table 1.

Example 9
8.8 g of platinum colloid (manufactured by Shinko Chemical Industry Co., Ltd., concentration 2.5% by mass) (3.08% by mass of platinum colloid with respect to a total of 100% by mass of π-conjugated conductive polymer and polyanion), Irgacure 127 (Ciba Specialty Chemicals) 0.9 g, 2,4-dihydroxybenzophenone 3.6 g, 2-hydroxyethylacrylamide 18 g, trimethylolpropane triacrylate 7.2 g, ethanol 300 g, 1-methoxy-2-propanol 200 g Were mixed and stirred. To this mixed solution, 600 g of the PEDOT-PSS aqueous solution obtained in Production Example 2 was added and subjected to a homogenizer dispersion treatment to obtain a conductive polymer solution I.
Then, a first transparent electrode was formed and evaluated in the same manner as in Example 1 except that the conductive polymer solution I was used instead of the conductive polymer solution A. The evaluation results are shown in Table 1.

(Example 10)
12.0 g of gold colloid (manufactured by Shinko Chemical Industry Co., Ltd., concentration: 1.8% by mass) (3.0% by mass of gold colloid with respect to 100% by mass of the π-conjugated conductive polymer and polyanion), Irgacure 127 (Ciba Specialty Chemicals) 0.9g, 3,4,5-trihydroxybenzoic acid 3.6g, 2-hydroxyethylacrylamide 18g, dipropylene glycol diacrylate 7.2g, ethanol 300g, 1-methoxy- 200 g of 2-propanol was mixed and stirred. To this mixed solution, 600 g of the PEDOT-PSS aqueous solution obtained in Production Example 2 was added and subjected to a homogenizer dispersion treatment to obtain a conductive polymer solution J.
Then, a first transparent electrode was formed and evaluated in the same manner as in Example 1 except that the conductive polymer solution J was used instead of the conductive polymer solution A. The evaluation results are shown in Table 1.

(Example 11)
Nickel colloid (manufactured by Shinko Chemical Industry Co., Ltd., concentration 2.8% by mass) 9.0 g (nickel colloid is 3.50% by mass with respect to 100% by mass of the π-conjugated conductive polymer and polyanion), Irgacure 127 (Ciba Specialty Chemicals Co., Ltd.) 0.9 g, phenyl 4-hydroxybenzoate 3.6 g, 2-hydroxyethyl acrylamide 18 g, sorbitol pentaacrylate 7.2 g, ethanol 300 g, 1-methoxy-2-propanol 200 g And stirred. To this mixed solution, 600 g of the PEDOT-PSS aqueous solution obtained in Production Example 2 was added and subjected to a homogenizer dispersion treatment to obtain a conductive polymer solution K.
Then, a first transparent electrode was formed and evaluated in the same manner as in Example 1 except that the conductive polymer solution K was used instead of the conductive polymer solution A. The evaluation results are shown in Table 1.

Example 12
11.7 g of palladium colloid (manufactured by Shinko Chemical Industry Co., Ltd., concentration: 3.0% by mass) (palladium colloid is 4.88% by mass with respect to 100% by mass of the π-conjugated conductive polymer and polyanion), Irgacure 127 (Manufactured by Ciba Specialty Chemicals) 0.9 g, 2,3,4-trihydroxybenzophenone 3.6 g, 2-hydroxyethylacrylamide 18 g, pentaerythritol ethoxytetraacrylate 7.2 g, ethanol 300 g, 1-methoxy-2 -200 g of propanol was mixed and stirred. To the mixed solution thus obtained, 600 g of the PEDOT-PSS aqueous solution obtained in Production Example 2 was added and subjected to a homogenizer dispersion treatment to obtain a conductive polymer solution L.
Then, a first transparent electrode was formed and evaluated in the same manner as in Example 1 except that the conductive polymer solution L was used instead of the conductive polymer solution A. The evaluation results are shown in Table 1.

(Comparative Example 1)
The addition amount of the gold-silver colloidal particles in Example 1 was changed to 0.05 g (the gold-silver colloidal particles were 0.003% by mass with respect to 100% by mass in total of the π-conjugated conductive polymer and the polyanion). In the same manner as in Example 1, a conductive polymer solution M was obtained. Then, a first transparent electrode was formed and evaluated in the same manner as in Example 1 except that the conductive polymer solution M was used instead of the conductive polymer solution A. The evaluation results are shown in Table 1.

(Comparative Example 2)
The same procedure as in Example 2 was conducted except that the amount of colloidal silver particles added in Example 2 was 8 g (silver ions were 55.6% by mass with respect to 100% by mass in total of the π-conjugated conductive polymer and the polyanion). As a result, a conductive polymer solution N was obtained. Then, a first transparent electrode was formed and evaluated in the same manner as in Example 1 except that the conductive polymer solution N was used instead of the conductive polymer solution A. The evaluation results are shown in Table 1.

(Comparative Example 3)
The same procedure as in Example 3 was performed except that the amount of silver colloid particles added in Example 3 was 180 g (the silver colloid particles were 7.5% by mass with respect to 100% by mass of the total amount of the π-conjugated conductive polymer and the polyanion). As a result, a conductive polymer solution O was obtained. Then, a first transparent electrode was formed and evaluated in the same manner as in Example 1 except that the conductive polymer solution O was used instead of the conductive polymer solution A. The evaluation results are shown in Table 1.

(Comparative Example 4)
The same procedure as in Example 4 was conducted except that the amount of colloidal silver sol added in Example 4 was 10 g (the colloidal silver sol was 16.7% by mass with respect to the total of 100% by mass of the π-conjugated conductive polymer and the polyanion). Thus, a conductive polymer solution P was obtained. Then, a first transparent electrode was formed and evaluated in the same manner as in Example 1 except that the conductive polymer solution P was used instead of the conductive polymer solution A. The evaluation results are shown in Table 1.

In Examples 1 to 12 in which the first transparent electrode includes a π-conjugated conductive polymer, a polyanion, and specific metal nanoparticles, the first transparent electrode has excellent conductivity and transparency, and the first transparent electrode The electrode had a low contact resistance with respect to the second transparent electrode.
Furthermore, since the first transparent electrodes of Examples 1 to 4 and 7 to 12 further included a polymer obtained by polymerizing (meth) acrylamide and polyfunctional acrylic, the film strength and adhesion to the transparent substrate were also improved. It was excellent.
Moreover, since the 1st transparent electrode of Example 5 did not contain an acrylic polymer, the coating-film intensity | strength before a sliding test was low, and the electroconductivity fell after the sliding test.
The first transparent electrode of Example 6 containing a polymer of (meth) acrylamide that was not copolymerized with a polyfunctional acrylic had low coating strength before the sliding test and decreased conductivity after the sliding test. The film strength before the sliding test was higher than that of Example 5.

The first transparent electrode of Comparative Example 1, which includes a π-conjugated conductive polymer, a polyanion, and specific metal nanoparticles, but the content of metal nanoparticles is less than 0.01% by mass, is a second transparent electrode. The contact resistance with respect to an electrode was large, and it was not suitable for input devices.
The first transparent electrodes of Comparative Examples 2 to 4, which contain a π-conjugated conductive polymer, a polyanion, and specific metal nanoparticles but have a metal particle content of 5% by mass or more, have sufficient transparency. It was not obtained and was not suitable for input devices.

It is sectional drawing which shows one embodiment of the input device of this invention. It is sectional drawing which shows an example of the movable electrode sheet which comprises an input device. It is sectional drawing which shows the fixed electrode sheet | seat which comprises an input device. It is a schematic diagram which shows the circuit in the measuring method of contact resistance.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Input device 10 Movable electrode sheet 11 1st transparent base material 12 1st transparent electrode 13a, 13b Electrode wiring 20 Fixed electrode sheet 21 2nd transparent base material 22 2nd transparent electrode 23a, 23b Electrode wiring 30 Dot spacer

Claims (1)

A first transparent electrode; and a second transparent electrode made of a transparent conductive metal oxide disposed so as to face the first transparent electrode. When the first transparent electrode is pressed, the second transparent electrode is provided. In an input device that contacts a transparent electrode of
The first transparent electrode contains a π-conjugated conductive polymer, a polyanion, and metal nanoparticles having an average particle diameter of 1 to 50 nm,
The metal forming the metal nanoparticles is one or more metals selected from the group consisting of silver, gold, nickel, copper, platinum, palladium, and indium, or alloys thereof;
An input device, wherein the content of the metal nanoparticles is 0.01% by mass or more and less than 5% by mass when the total of the π-conjugated conductive polymer and the polyanion is 100% by mass.

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