JP2013156776A - Touch panel and method of manufacturing touch panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a touch panel including a detection electrode of low resistance value composed of metallic material, and a method of manufacturing the same.SOLUTION: A touch panel 1 comprises a first detection electrode 3 and a second detection electrode 4 arranged in a matrix shape on a substrate 2. The first detection electrode 3 and the second detection electrode 4 are formed by heating under a temperature T(°C) having the relationship of following formula with the boiling point T(°C) of (B) amine, under an atmosphere or under a non-oxidizing atmosphere, using an electrode formation composition including (A) copper formate or a hydrate thereof and the (B) amine.

Description

  The present invention relates to a touch panel and a method for manufacturing the touch panel.

  2. Description of the Related Art In recent years, touch panels have been used as input devices for electronic devices such as PDAs (Personal Digital Assistants), notebook PCs, OA devices, and car navigation systems.

The touch panel touches (presses) the surface with an operator's finger, pen, or the like, and outputs data related to the touch operation to various processing devices, thereby enabling operation of the electronic device.
The touch panel is an input device that replaces a keyboard, and enables easy input of information in an interactive manner in the electronic device described above. The touch panel includes a resistance film method, a capacitance method, an infrared method, an ultrasonic method, an electromagnetic inductive coupling method, and the like depending on an operation principle.

  In such a touch panel, for example, a plurality of first detection electrodes extending in a predetermined direction and a second detection electrode extending in a direction crossing the plurality of first detection electrodes, such as a capacitance method, are combined with glass, a resin substrate, or the like. There are some which are arranged on a transparent substrate.

  FIG. 5 is a plan view showing a conventional touch panel.

  A conventional touch panel 100 shown in FIG. 5 has a strip-shaped first detection electrode 102 extending in the X direction, which is the horizontal direction of the drawing, on the surface of an insulating transparent substrate 101. A strip-shaped second detection electrode 103 extending in the Y direction orthogonal to the first detection electrode 102 is disposed on the rear surface. The touch panel 100 includes a first detection electrode 102 and a second detection electrode 103 that intersects the first detection electrode 102 with an insulating and transparent substrate 101 interposed therebetween.

  In the conventional touch panel 100, the capacitance is measured using the first detection electrode 102 and the second detection electrode 103 as sensors, and the contact position of the finger or the like is determined from the change in capacitance caused by the touch of the operator's finger or the like. Detect.

  As such a capacitive touch panel, a structure disclosed in Patent Document 1 is known in addition to the structure shown in FIG. The touch panel disclosed in Patent Document 1 has a structure in which a second detection electrode is superimposed on a first detection electrode formed on the surface of a transparent substrate via an insulating film. That is, in the touch panel of Patent Document 1, the first detection electrode and the second detection electrode are arranged on different layers on one surface of the transparent substrate with the insulating film interposed therebetween.

  In the case of the touch panel having the above structure, high light transmittance is required so that it can be suitably used as an input device for a display of an electronic device. As a result, the detection electrode of the touch panel is usually a transparent electrode formed by patterning a transparent conductive film such as ITO (Indium Tin Oxide).

  However, for example, in the case of a detection electrode made of ITO, the low efficiency of ITO is high, and the sheet resistance is usually 200Ω / □ to 1000Ω / □. Therefore, when the display is enlarged and the size of the touch panel is increased, the resistance value between the terminals of the detection electrode is increased. As a result, the sensitivity of the capacitance measurement is lowered, and the configuration of the touch panel becomes difficult.

  Therefore, Patent Document 2 discloses a technique in which an electrode patterned in an ultrathin strip made of a metal material is used as a detection electrode of a touch panel.

  As a method for forming a patterned detection electrode or the like on a circuit board including such a touch panel, a method using a photolithography technique is known as disclosed in Patent Document 2.

  In this method, first, a uniform solid metal film is formed on a substrate. As a method for forming the metal film, it is possible to use a vapor deposition method or a sputtering method in addition to the plating method. Then, a resist solution is applied on the formed metal film to form a resist layer. Next, the resist layer is patterned by irradiating the resist layer with ultraviolet rays using a photomask and then developing the resist layer. Next, the metal film not covered with the resist layer is removed by etching, and the remaining resist portion is peeled off to obtain a patterned metal electrode. The method using the photolithography technique makes it possible to set the line width of the electrode pattern to be formed on the order of submicrons, which is an effective pattern forming method.

However, in a plating method used for forming a metal film, formation of a seed layer by a sputtering method and a plating process are usually required. Since sputtering needs to be performed in a vacuum, there are significant restrictions on the apparatus and operation. Also, the process takes a long time and the production efficiency is low. In the plating process, the waste liquid treatment of the plating solution is a big environmental problem.
Similarly, even when vapor deposition or sputtering is used to form a metal film, it is necessary to form the film in a vacuum, so there are significant restrictions on the equipment and operation, and it takes a long time for processing and is efficient. A metal film cannot be formed. In any of the methods, there is a problem that the productivity of the touch panel is reduced because of unnecessary waste of raw materials, such as the need to remove unnecessary metal films.

  In recent years, a technique for directly drawing a patterned metal electrode using a dispersion obtained by dispersing metal fine particles in an organic solvent or the like has attracted attention as a method using such a photolithography technique. For example, a desired pattern is formed using a dispersion of metal fine particles by an ink jet printing method or a screen printing method. When the average particle diameter of the metal fine particles is about several nanometers to several tens of nanometers, the melting point is lower than that of the bulk metal, and the particles are fused by heating at about 300 ° C. The above-described technique utilizes such a phenomenon to obtain a patterned metal electrode by sintering metal fine particles.

As a composition for forming such a metal electrode, one containing silver nanoparticles as a metal fine particle is known.
However, in the case of silver, there is a problem that electromigration tends to occur. Moreover, silver is a noble metal and becomes an expensive material compared with copper etc. which are easy to acquire. Therefore, there is a problem that the silver nanoparticles themselves are expensive and increase the cost of the metal film forming process. Electromigration is a phenomenon in which a metal component (for example, a metal used for a wiring or an electrode) moves over or inside a non-metallic medium (for example, an insulator) due to the influence of an electric field.

  Further, in the technique using metal fine particles, it was difficult to completely fuse the metal fine particles by sintering at a low temperature. Therefore, in the metal pattern obtained after sintering, there is a problem that a desired electrical resistance characteristic, in particular, low resistance cannot be realized as compared with a bulk metal.

Therefore, a technique for forming a metal electrode using a metal salt or the like as a raw material instead of the metal fine particle has been studied. For example, a method is known in which a composition is prepared by combining an easily available copper salt and a reducing agent, a copper film is obtained using the composition, and a copper electrode is formed.
However, the method using such a readily available copper salt as a raw material also makes it difficult to reduce the resistance of the formed copper film, and it is usually difficult to reduce the resistance to the same level as that of bulk copper.

For example, in the techniques disclosed in Patent Document 3 and Patent Document 4, copper formate as a raw material and an amine are combined to realize the production of fine particle size copper particles. Then, the manufactured fine particle size copper particles are dispersed to prepare an ink. Next, an ink containing the fine particle size copper particles is applied, and the coating film is baked at 300 ° C. in an argon (Ar) atmosphere to form a line-shaped copper electrode. However, these patent documents do not describe whether or not the formed copper electrode has a low resistance.
Therefore, it is not clear whether a touch panel provided with a low-resistance detection electrode can be provided using such a technique. Moreover, the firing temperature of 300 ° C. limits the substrate used for the touch panel to a glass substrate or the like, making it difficult to use the resin substrate.

  Furthermore, heating of the coating film after ink application may require heating in a reducing atmosphere. For the reducing atmosphere, for example, flammable hydrogen gas needs to be used, and a copper electrode may not be formed easily and safely with high productivity. For example, in patent document 5, formation of the copper film used as an electrode is implement | achieved by the composition which combined copper formate and alkanolamine. However, when forming the copper film, firing in a reducing atmosphere is required, and the copper electrode cannot be formed by a simple method such as heating in the air.

JP 2011-186717 A JP 2006-344163 A JP 2008-13466 A JP 2008-31104 A JP 2010-242118 A

  Therefore, there is a need to provide a touch panel configured by arranging a low resistance detection electrode made of a metal material on a glass substrate or a resin substrate without using a conventional transparent electrode such as ITO. And the manufacturing method of the touch panel which forms the low resistance detection electrode which consists of metal materials on a glass substrate or a resin substrate is calculated | required.

  More specifically, in the required touch panel, the detection electrode is preferably made of a metal material and patterned using a desired coating method using a composition for electrode formation. That is, the detection electrode uses a composition for forming an electrode prepared using a readily available material such as a copper salt without using metal fine particles as a raw material, and forms a reducing atmosphere with a reducing gas or the like. There is a need for a touch panel that can be formed even by low-temperature heating on a resin substrate, and a method for manufacturing such a touch panel is required.

  The present invention has been made based on the above findings. That is, an object of the present invention is to provide a touch panel provided with a low resistance detection electrode made of a metal material.

  Moreover, the objective of this invention is providing the manufacturing method of the touch panel which forms the low resistance detection electrode which consists of metal materials, and manufactures a touch panel.

  Other objects and advantages of the present invention will become apparent from the following description.

The first aspect of the present invention is:
A substrate,
A touch panel having a detection electrode disposed on the substrate,
The sensing electrode
The present invention relates to a touch panel, which is formed using an electrode forming composition containing (A) a copper salt and (B) a reducing agent.

  In the first aspect of the present invention, the substrate is preferably a resin substrate.

In the first aspect of the present invention, the detection electrode comprises:
(A) An electrode forming composition using (A-1) copper formate or a hydrate thereof as a copper salt, (B) (B-1) an amine as a reducing agent,
(B-1) It is preferably formed by heating at a temperature T (° C.) having a relationship of the following (Equation 1) with the boiling point T _bp (° C.) of the amine.

  In the first aspect of the present invention, the (B-1) amine is preferably represented by at least one of the following general formula (1), the following general formula (2), and the following general formula (3). .

（一般式（１）中、Ｒ^１、Ｒ^２は、それぞれ独立に水素原子、炭素数１から１８のアルキル基、または、炭素数３から１８の脂環式炭化水素基を示す。Ｒ^３は、単結合、メチレン基、炭素数２から１２のアルキレン基、または、フェニレン基を示す。Ｒ^４は、水素原子、炭素数１から１８のアルキル基、炭素数３から１８の脂環式炭化水素基、アミノ基、ジメチルアミノ基、または、ジエチルアミノ基を示す。）

(In General Formula (1), R ¹ and R ² each independently represent a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. R ³ represents , A single bond, a methylene group, an alkylene group having 2 to 12 carbon atoms, or a phenylene group, R ⁴ represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon having 3 to 18 carbon atoms. Group, amino group, dimethylamino group, or diethylamino group.)

（一般式（２）中、Ｒ^５、Ｒ^６は、それぞれ独立に水素原子、炭素数１から１８のアルキル基、または、炭素数３から１８の脂環式炭化水素基を示す。Ｒ^７は、メチレン基、炭素数２から１２のアルキレン基、または、フェニレン基を示す。Ｒ^８は、炭素数１から１８のアルキル基、または、炭素数３から１８の脂環式炭化水素基を示す。但し、Ｒ^５およびＲ^６が水素原子の場合、Ｒ^８はメチル基およびエチル基以外を示す。）

(In General Formula (2), R ⁵ and R ⁶ each independently represent a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. R ⁷ represents , A methylene group, an alkylene group having 2 to 12 carbon atoms, or a phenylene group, and R ⁸ represents an alkyl group having 1 to 18 carbon atoms or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. (However, when R ⁵ and R ⁶ are hydrogen atoms, R ⁸ represents a group other than a methyl group or an ethyl group.)

（一般式（３）中、Ｒ^９、Ｒ^１０は、それぞれ独立に水素原子、炭素数１から１８のアルキル基、または、炭素数３から１８の脂環式炭化水素基を示す。Ｒ^１１は、メチレン基、炭素数２から１２のアルキレン基、または、フェニレン基を示す。Ｒ^１２、Ｒ^１３は、それぞれ独立に、炭素数１から１８のアルキル基、または、炭素数３から１８の脂環式炭化水素基を示す。）

(In General Formula (3), R ⁹ and R ¹⁰ each independently represent a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. R ¹¹ represents , A methylene group, an alkylene group having 2 to 12 carbon atoms, or a phenylene group, R ¹² and R ¹³ each independently represents an alkyl group having 1 to 18 carbon atoms or an alicyclic ring having 3 to 18 carbon atoms. Represents a hydrocarbon group.)

  1st aspect of this invention WHEREIN: It is preferable that an electrode formation composition further contains the (C) solvent.

  1st aspect of this invention WHEREIN: It is preferable that content of (A-1) copper formate or its hydrate of an electrode formation composition is 0.01 mass%-50 mass% of all the components.

The second aspect of the present invention is:
(A-1) forming a coating film of an electrode forming composition containing copper formate or a hydrate thereof and (B-1) amine on a substrate;
(B-1) The detection electrode is heated by heating the coating film in the air or in a non-oxidizing atmosphere at a temperature T (° C.) having the relationship of the boiling point T _bp (° C.) of the amine and the following (Formula 1). The manufacturing method of the touchscreen characterized by having a process to form.

  In the second aspect of the present invention, the (B-1) amine is preferably represented by at least one of the following general formula (1), the following general formula (2), and the following general formula (3). .

（一般式（１）中、Ｒ^１、Ｒ^２は、それぞれ独立に水素原子、炭素数１から１８のアルキル基、または、炭素数３から１８の脂環式炭化水素基を示す。Ｒ^３は、単結合、メチレン基、炭素数２から１２のアルキレン基、または、フェニレン基を示す。Ｒ^４は、水素原子、炭素数１から１８のアルキル基、炭素数３から１８の脂環式炭化水素基、アミノ基、ジメチルアミノ基、または、ジエチルアミノ基を示す。）

(In General Formula (1), R ¹ and R ² each independently represent a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. R ³ represents , A single bond, a methylene group, an alkylene group having 2 to 12 carbon atoms, or a phenylene group, R ⁴ represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon having 3 to 18 carbon atoms. Group, amino group, dimethylamino group, or diethylamino group.)

（一般式（２）中、Ｒ^５、Ｒ^６は、それぞれ独立に水素原子、炭素数１から１８のアルキル基、または、炭素数３から１８の脂環式炭化水素基を示す。Ｒ^７は、メチレン基、炭素数２から１２のアルキレン基、または、フェニレン基を示す。Ｒ^８は、炭素数１から１８のアルキル基、または、炭素数３から１８の脂環式炭化水素基を示す。但し、Ｒ^５およびＲ^６が水素原子の場合、Ｒ^８はメチル基およびエチル基以外を示す。）

(In General Formula (2), R ⁵ and R ⁶ each independently represent a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. R ⁷ represents , A methylene group, an alkylene group having 2 to 12 carbon atoms, or a phenylene group, and R ⁸ represents an alkyl group having 1 to 18 carbon atoms or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. (However, when R ⁵ and R ⁶ are hydrogen atoms, R ⁸ represents a group other than a methyl group or an ethyl group.)

（一般式（３）中、Ｒ^９、Ｒ^１０は、それぞれ独立に水素原子、炭素数１から１８のアルキル基、または、炭素数３から１８の脂環式炭化水素基を示す。Ｒ^１１は、メチレン基、炭素数２から１２のアルキレン基、または、フェニレン基を示す。Ｒ^１２、Ｒ^１３は、それぞれ独立に、炭素数１から１８のアルキル基、または、炭素数３から１８の脂環式炭化水素基を示す。）

(In General Formula (3), R ⁹ and R ¹⁰ each independently represent a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. R ¹¹ represents , A methylene group, an alkylene group having 2 to 12 carbon atoms, or a phenylene group, R ¹² and R ¹³ each independently represents an alkyl group having 1 to 18 carbon atoms or an alicyclic ring having 3 to 18 carbon atoms. Represents a hydrocarbon group.)

  In the second aspect of the present invention, the electrode-forming composition preferably further comprises (C) a solvent.

  2nd aspect of this invention WHEREIN: It is preferable that content of (A-1) copper formate or its hydrate of an electrode formation composition is 0.01 mass%-50 mass% of all the components.

  According to the first aspect of the present invention, a touch panel including a low resistance detection electrode made of a metal material is provided.

  According to the 2nd aspect of this invention, the manufacturing method of the touch panel which forms the low resistance detection electrode which consists of metal materials, and manufactures a touch panel is provided.

It is a top view which shows the 1st example of the touchscreen which is 1st Embodiment of this invention. It is sectional drawing which follows the A-A 'line of FIG. It is sectional drawing which shows the structure of the 2nd example of the touchscreen which is 1st Embodiment of this invention. It is sectional drawing which shows the structure of the 3rd example of the touchscreen which is 1st Embodiment of this invention. It is a top view which shows the conventional touch panel.

  In the present invention, an electrode forming composition effective for forming a detection electrode, which is a main component of the touch panel, is realized.

  This electrode-forming composition is prepared using a reducing agent using an easily available copper salt as a raw material for electrode formation.

  In this invention, copper salt means the compound containing the copper ion which is a cation. Such copper salts include fluoride, chloride, bromide, iodide, nitrite, nitrate, sulfite, sulfate, phosphite, phosphate, pyrophosphate, carboxylate and the like. In the present invention, among these, it is preferable to use a carboxylate that can easily remove components other than copper at the time of electrode formation. Examples thereof include copper formate, copper hydroxyacetate, copper glyoxylate, copper lactate, copper oxalate, copper tartrate, copper malate and copper citrate. In the present invention, it is particularly preferable to use copper formate as the copper salt for the reasons described later.

Further, as the reducing agent, it is particularly preferable to use an amine which is easily available and is contained in the electrode composition and suitable for forming the electrode.
Therefore, the electrode forming composition of the present invention can be prepared using copper formate as the copper salt and amine as the reducing agent.

  For example, the electrode forming composition can be applied onto a substrate to form a coating film of the electrode forming composition, and the coating film can be heated to form a copper film. Then, the coating film can be patterned by using a known printing method. By heating the patterned coating film of the electrode forming composition, a desired shape is formed on the resin substrate or the glass substrate. A sensing electrode made of copper can be formed as the patterned copper film.

As a result of intensive studies, the present inventor has used copper formate as the copper salt, amine as the reducing agent, and the boiling point T _bp (° C.) of the amine used with copper formate and the heating temperature T (° C.) during the formation of the copper film. And satisfying the relationship of the following (Equation 1), it was found that the resistance can be reduced in the formed sensing electrode made of copper.

  In the electrode forming composition of the present embodiment, as a particularly preferable composition, when copper formate and an amine are contained, a divalent copper ion and an amine salt are formed by mixing them, and formic acid is generated in the reaction system. To do. This formic acid, divalent copper ion, and amine salt react thermally to form copper nanoparticles in the reaction system, and the copper nanoparticles are fused by heating to form a sensing electrode as a copper film. It is understood that is formed.

  Therefore, the amine as the reducing agent remains in the reaction system without volatilizing, and it is necessary to stably form a salt with divalent copper ions, and the relationship between the boiling point of the amine and the heating temperature at the time of copper film formation Is very important. The present inventor continued intensive studies and found the relationship shown in the above (Equation 1).

  For example, it is a commonly performed method to set the heating temperature below the boiling point of the amine so that the amine as the reducing agent does not volatilize during the detection electrode formation reaction. In order to promote the fusion of copper nanoparticles, it is also a common practice to perform heating at a high temperature and select and use a high-boiling amine so as to withstand such a high temperature.

  However, in the present invention, as will be described in detail later, even when the heating temperature at the time of forming the detection electrode is higher than the boiling point of the amine used as the reducing agent, it is possible to form a low resistance detection electrode made of copper. Specifically, as shown in the above (Equation 1), by selecting a heating temperature within the range of 100 ° C. higher than the boiling point of the amine from the boiling point of the amine, the low resistance detection electrode made of copper is selected. Allows formation.

  Furthermore, for example, a suitable resistance can be selected even under low temperature heating conditions of 100 ° C. to 200 ° C., and a detection electrode having a low resistance value can be formed as long as the relationship shown in (Formula 1) is satisfied. . As a result, the electrode-forming composition of the present invention forms a low-resistance detection electrode by, for example, heating at a low temperature of 200 ° C. or lower, and further by heating at a lower temperature of 100 ° C. to 150 ° C. be able to.

  Furthermore, the electrode-forming composition of the present invention is configured to contain an amine as a reducing agent, and does not particularly require heating in a reducing atmosphere using a reducing gas such as hydrogen during film formation. . The electrode forming composition of the present invention can form a copper film by heating in the air or in a non-oxidizing atmosphere using a gas such as nitrogen or argon (Ar). Therefore, the electrode-forming composition of the present invention can form a copper film by a safe heating process without using hydrogen gas that has a risk of explosion in the heating process when forming the copper film.

  Hereinafter, the structure of a touch panel according to an embodiment of the present invention will be described, and then an electrode forming composition for forming a detection electrode which is a main component, and formation of a detection electrode using the electrode forming composition Will be described.

Embodiment 1 FIG.
<Touch panel>
The touch panel of 1st Embodiment of this invention is a touch panel which has a board | substrate and the detection electrode arrange | positioned on the board | substrate. As the detection electrode, a detection electrode made of copper, which is a metal material, is used instead of a transparent conductive film such as ITO. The touch panel of this embodiment can be a capacitive touch panel, for example.

  FIG. 1 is a plan view showing a first example of a touch panel according to the first embodiment of the present invention.

  FIG. 2 is a cross-sectional view taken along the line A-A ′ of FIG. 1.

  As shown in FIG. 1, the touch panel 1 which is the 1st example of this embodiment is extended on the board | substrate 2 in the 2nd direction different from the 1st detection electrode 3 extended in a 1st direction, and a 1st direction. The second detection electrode 4 is disposed.

  More specifically, the touch panel 1 has a plurality of first detection electrodes 3 extending on the surface of the substrate 2 in the X direction, which is the left-right direction (horizontal direction) in FIG. The plurality of first detection electrodes 3 are arranged at a predetermined interval on the surface of the substrate 2. The back surface of the substrate 2 has a plurality of second detection electrodes 4 extending in the Y direction orthogonal to the X direction. The plurality of second detection electrodes 4 are arranged on the back surface of the substrate 2 at a predetermined interval.

  The first detection electrode 3 is used to detect the coordinate in the Y direction of the touch position by the operator. The second detection electrode 4 is used to detect the coordinate in the X direction of the touch position by the operator.

The substrate 2 is preferably a transparent substrate having visible light transparency. For example, the substrate 2 can be a glass substrate.
In particular, the substrate 2 can also be a resin substrate, in which case, a polyethylene terephthalate film, a polybutylene terephthalate film, a polyethylene film, a polypropylene film, a polyethersulfone film, a polycarbonate film, a polyacrylic film, a polyvinyl chloride film, A polyimide film, a ring-opened polymer film of cyclic olefin, a film made of a hydrogenated product thereof, and the like can be used. The thickness of the substrate 2 can be 0.1 mm to 2 mm in the case of a glass substrate. In the case of a resin substrate, it can be 10 μm to 2000 μm.

  As shown in FIG. 1, each of the first detection electrode 3 and the second detection electrode 4 has a thin line shape. The first detection electrode 3 and the second detection electrode 4 are arranged at a predetermined interval as described above, and are arranged so as to be orthogonal to each other via the substrate 2. And the 1st sensing electrode 3 and the 2nd sensing electrode 4 are arrange | positioned at matrix form, and comprise the operation area | region of the touch panel 1 in which an operator performs touch operation.

  Each of the first detection electrode 3 and the second detection electrode 4 is a line-shaped metal electrode made of copper. The 1st sensing electrode 3 and the 2nd sensing electrode 4 are formed using the electrode formation composition of embodiment of this invention.

The electrode forming composition of the embodiment of the present invention is prepared by including copper formate, which is a copper salt, or a hydrate thereof, and an amine, which is a reducing agent. And after forming the coating film patterned by the desired coating methods, such as a screen printing method, on the said board | substrate 2, in air | atmosphere or non-oxidizing atmosphere, the boiling point _Tbp ( _degreeC ) of amine and following ( The first detection electrode 3 and the second detection electrode 4 made of copper are formed by heating at a temperature T (° C.) that is in the relationship of Formula 1).
In addition, the electrode formation composition of embodiment of this invention is explained in full detail behind.

The first detection electrode 3 and the second detection electrode 4 preferably have a line width of 10 μm to 500 μm, and more preferably a line width of 10 μm to 200 μm in order to improve the light transmission characteristics of the touch panel 1.
It is preferable that the thickness of the 1st sensing electrode 3 and the 2nd sensing electrode 4 is 0.05 micrometer-20 micrometers so that low resistance can be implement | achieved.

  Note that the numbers of the first detection electrodes 3 and the second detection electrodes 4 are not limited to the example of FIG. 1, and can be larger or smaller. In accordance with the size of the operation area and the required detection accuracy of the position of the touch operation, the number and arrangement interval of the first detection electrodes 3 and the second detection electrodes 4 are determined in consideration of the light transmittance of the touch panel 1. be able to.

  The portion formed outside the operation region of the first detection electrode 3 and the second detection electrode 4 can be used as a lead-out wiring. Each end constitutes a connection terminal (not shown), and is electrically connected to an external control circuit (not shown) that detects the position of the voltage application to the first detection electrode 3 and the second detection electrode 4 and the touch operation. Connected.

  In the touch panel 1, a protective film (not shown) can be disposed on the surface of the substrate 2 on which the first detection electrode 3 is disposed so as to cover the first detection electrode 3. Similarly, a similar protective film can be disposed on the back surface side where the second detection electrode 4 is disposed so as to cover the second detection electrode 4. As the protective film, a protective film described in JP 2010-434 A can be used.

  In the touch panel 1, an adhesive layer (not shown) made of, for example, an acrylic transparent adhesive can be provided on the formation surface of the second detection electrode 4 of the substrate 2. For example, it can be mounted on a display such as a liquid crystal display element. Further, a cover film (not shown) made of a transparent resin is provided on the surface of the substrate 2 on which the first detection electrode 3 is formed using, for example, an adhesive layer (not shown) made of an acrylic transparent adhesive. Is possible. Thus, it can be suitably used as an input device for a display of an electronic device.

  The touch panel 1 having the above configuration is configured to include a low resistance detection electrode made of a metal material without using a conventional transparent electrode such as ITO. The first detection electrode 3 and the second detection electrode 4 of the touch panel 1 use the electrode forming composition according to the embodiment of the present invention, for example, on the substrate 2 that is a resin substrate by using a coating method such as screen printing. It is formed. That is, the first detection electrode 3 and the second detection electrode 4 of the touch panel 1 use an electrode forming composition prepared using an easily available material such as a copper salt without using metal fine particles as a raw material, This is a detection electrode that can be formed by low-temperature heating without forming a reducing atmosphere with a reducing gas or the like. The first detection electrode 3 and the second detection electrode 4 of the touch panel 1 are made of a metal material and patterned into a desired shape.

  Therefore, the touch panel 1 measures the electrostatic capacitance in the operation region in which the first detection electrodes 3 and the second detection electrodes 4 are arranged in a matrix, and generates static electricity when a touch operation such as an operator's finger is performed. The contact position of a finger or the like can be detected from the change in capacitance.

  In the touch panel according to the first embodiment of the present invention, the second detection electrode 4 of the touch panel 1 of the first example described above is not provided on the back side of the substrate 2 but provided on the first detection electrode 3 on the front side. It is possible to configure the second example of the touch panel.

  FIG. 3 is a sectional view showing the structure of a second example of the touch panel according to the first embodiment of the present invention.

  A touch panel 11, which is a second example of the present embodiment shown in FIG. 3, has a structure in which a plurality of first detection electrodes 13 are provided on the surface of the substrate 12 and the second detection electrodes 14 are overlapped via an insulating layer 17. Have. That is, in the touch panel 1 of the first example shown in FIG. 1 and FIG. 2, the second detection electrode 4 arranged on the back surface side is connected to the first detection electrode 3 on the front surface side through the newly provided insulating layer. It has a structure that overlaps. The planar arrangement structure of the first detection electrode 13 and the second detection electrode 14 is a structure in which the first detection electrode 13 and the second detection electrode 14 overlap with each other through the insulating layer 17, but is the same as the touch panel 1 in FIG. 1. It becomes. Therefore, in the touch panel 11 as the second example of the present embodiment, the plurality of first detection electrodes 13 extend in the X direction on the surface of the substrate 12 and overlap with the first detection electrodes 13 via the insulating layer 17. A plurality of second detection electrodes 14 arranged in this manner extend in the Y direction.

  The first detection electrode 13 and the second detection electrode 14 of the touch panel 11 each have a thin line shape, and the first detection electrode 3 and the second detection electrode 3 of the touch panel 1 described above except that the arrangement of the second detection electrodes 14 is different. Each of the two detection electrodes 4 is the same. That is, the 1st sensing electrode 13 and the 2nd sensing electrode 14 are the linear metal electrodes which consist of copper formed using the electrode formation composition of embodiment of this invention.

  And the 1st sensing electrode 13 and the 2nd sensing electrode 14 are arrange | positioned at matrix form similarly to the 1st sensing electrode 3 and the 2nd sensing electrode 4 of the touch panel 1 of FIG. 1, and comprise the operation area | region of the touch panel 11. . And the 1st detection electrode 13 is used in order to detect the coordinate of the Y direction of the touch position by an operator. The second detection electrode 14 is used to detect the coordinate in the X direction of the touch position by the operator.

  Moreover, the board | substrate 12 can also be made into the same thing as the board | substrate 2 of the touch panel 1, For example, it can be set as the resin substrate illustrated above.

The insulating layer 17 of the touch panel 11 is a layer provided to ensure insulation between the first detection electrode 13 and the second detection electrode 14. The insulating layer 17 is a dielectric layer and performs the same function as the substrate 2 in the touch panel 1. The insulating layer 17 can be formed by applying a printing method such as polysiloxane, an acrylic resin, and an acrylic monomer, performing patterning when necessary, and then heat-curing it. In the case of using polysiloxane, the insulating layer 17 is an inorganic insulating layer made of silicon oxide (SiO ₂ ). Further, when an acrylic resin and an acrylic monomer are used, the insulating layer 17 is an organic insulating layer made of resin.

  The touch panel 11 is the same as the touch panel 1 described above so as to cover the first detection electrode 13 and the second detection electrode 14 on the surface of the substrate 12 on which the first detection electrode 13 and the second detection electrode 14 are arranged. A protective film (not shown) can be disposed.

  The touch panel 11 having the above-described configuration includes the first detection electrode 13 and the second detection electrode 14 made of a low-resistance metal material without using a conventional transparent electrode such as ITO. The touch panel 11 measures the capacitance in an operation region in which the first detection electrode 13 and the second detection electrode 14 are arranged in a matrix, and the capacitance generated when a touch operation such as an operator's finger is performed. From the change, the contact position of a finger or the like can be detected.

  In the touch panel according to the first embodiment of the present invention, in the touch panel 11 of the second example described above, the insulating film 17 is provided only at the intersecting portion between the first detection electrode 13 and the second detection electrode 14, Three examples can be configured.

  FIG. 4 is a sectional view showing the structure of a third example of the touch panel according to the first embodiment of the present invention.

  A touch panel 21, which is a third example of the present embodiment shown in FIG. 4, has a plurality of first detection electrodes 23 on the surface of the substrate 22, and the second detection electrodes 24 via an insulating layer 27 in the operation area of the touch panel. Has a structure of overlapping. That is, in the touch panel 1 of the first example shown in FIG. 1 and FIG. 2, the second detection electrode 4 arranged on the back surface side is connected to the first detection electrode 3 on the front surface side through the newly provided insulating layer. It has a structure that overlaps. The insulating layer 27 of the touch panel 21 has a structure formed only at the intersection of the first detection electrode 23 and the second detection electrode 24.

  The planar arrangement structure of the first detection electrode 23 and the second detection electrode 24 of the touch panel 21 is a structure in which the first detection electrode 23 and the second detection electrode 24 overlap with each other through the insulating layer 27, but the touch panel of FIG. 1 is the same. Therefore, in the touch panel 21 which is the third example of the present embodiment, the plurality of first detection electrodes 23 extend in the X direction on the surface of the substrate 22. A plurality of second detection electrodes 24 arranged to overlap the first detection electrode 23 via the insulating layer 27 extend in the Y direction.

  The first detection electrode 23 and the second detection electrode 24 of the touch panel 21 have a thin line shape, respectively, and are the same as the first detection electrode 13 and the second detection electrode 14 of the touch panel 11 described above, As a result, it is the same as each of the first detection electrode 3 and the second detection electrode 4 of the touch panel 1 described above. That is, the 1st sensing electrode 23 and the 2nd sensing electrode 24 are the linear metal electrodes which consist of copper formed using the electrode formation composition of embodiment of this invention.

  And the 1st detection electrode 23 and the 2nd detection electrode 24 are arrange | positioned at matrix form similarly to the 1st detection electrode 3 and the 2nd detection electrode 4 of the touch panel 1 of FIG. 1, and comprise the operation area | region of the touch panel 21. . And the 1st detection electrode 23 is used in order to detect the coordinate of the Y direction of the touch position by an operator. The second detection electrode 24 is used to detect the coordinate in the X direction of the touch position by the operator.

  Further, the substrate 22 can be the same as the substrate 2 of the touch panel 1 or the substrate 12 of the touch panel 11, and can be, for example, the resin substrate exemplified above.

  A plurality of insulating layers 27 of the touch panel 21 are formed, and are provided at the intersections of the first detection electrodes 23 and the second detection electrodes 24 so as to ensure insulation between them.

The insulating layer 27 is a dielectric layer, performs the same function as the substrate 2 in the touch panel 1, and prevents the first detection electrode 23 and the second detection electrode 24 from conducting at the intersection of each other. The insulating layer 27 can be formed by coating using a printing method such as polysiloxane, acrylic resin, and acrylic monomer, patterning as necessary, and then heat-curing it. When formed using polysiloxane, the insulating layer 27 is an inorganic insulating layer made of silicon oxide (SiO ₂ ). Further, when an acrylic resin and an acrylic monomer are used, the insulating layer 27 is an organic insulating layer made of resin.

  In the touch panel 21, the touch panel 1 and the touch panel described above are provided so as to cover the first detection electrode 23 and the second detection electrode 24 on the surface of the substrate 22 on which the first detection electrode 23 and the second detection electrode 24 are arranged. A protective film (not shown) similar to 11 can be disposed.

  The touch panel 21 having the above configuration is configured to include a first detection electrode 23 and a second detection electrode 24 having a low resistance value made of a metal material without using a conventional transparent electrode such as ITO. The touch panel 21 measures the capacitance in an operation region in which the first detection electrodes 23 and the second detection electrodes 24 are arranged in a matrix, and the capacitance generated when a touch operation such as an operator's finger is performed. From the change, the contact position of a finger or the like can be detected.

  In addition, the touch panel of 1st Embodiment of this invention is not restricted to the example mentioned above, If it is a structure provided with the detection electrode formed using the electrode formation composition of embodiment of this invention on a board | substrate, it will be other It is possible to have a structure. For example, a first detection electrode extending in a first direction is disposed on one substrate, and a second detection electrode extending in a second direction different from the first direction is disposed on another substrate. Then, the pair of substrates is adhered via an adhesive layer serving as an insulating layer so that the detection electrode formation surfaces face each other and the first detection electrode and the second detection electrode intersect to constitute a touch panel. Is possible. In that case, a 1st sensing electrode and a 2nd sensing electrode become a linear sensing electrode which consists of copper formed using the electrode formation composition of embodiment of this invention.

As described above, the touch panel according to the first embodiment of the present invention includes the low-resistance detection electrode made of a metal material. The detection electrodes constituting the operation area of the touch panel are thin and line-like, and suppress the significant decrease in light transmittance of the touch panel. Therefore, the touch panel of this embodiment can be suitably used as an input device for a display of an electronic device by being arranged on a display panel such as a liquid crystal panel.
Next, the electrode formation composition which is 2nd Embodiment of this invention used for formation of the detection electrode of the touchscreen which is 1st Embodiment of this invention is demonstrated in detail.

Embodiment 2. FIG.
<Electrode forming composition>
The electrode forming composition of the present embodiment is prepared using a copper salt that is easily available as a raw material for electrode formation and using a reducing agent. As the copper salt, copper formate, which is copper carboxylate, can be used, and as the reducing agent, amine can be used. That is, the electrode forming composition of the present embodiment can contain copper formate and an amine described below.

  And the electrode formation composition of this Embodiment is apply | coated on a suitable board | substrate, and is heated, and forms the copper film which is a metal film. The electrode forming composition of the present embodiment can be applied to various coating methods. Therefore, in the electrode forming composition of the present embodiment, the coating film can be patterned, and the detection electrode of the touch panel can be formed as a copper film patterned into a desired shape.

[Copper formate]
The electrode formation composition of this Embodiment can contain copper formate which is copper carboxylate as a raw material of metallic copper, and can implement | achieve the low resistance of the detection electrode of the touchscreen which consists of copper formed. .

  Copper formate may be anhydrous or hydrated. Tetrahydrate is known as a hydrate of copper formate. In the following description, “copper formate” is a concept including copper formate and hydrates thereof.

  The purity of copper formate is not particularly limited. However, when the purity is low, there is a concern that the conductivity is lowered when the detection electrode is formed as a conductive film. Therefore, the purity of copper formate is preferably 90% or more, and more preferably 95% or more. A commercially available product of copper formate can be used, and the obtaining method and the like are not particularly limited.

  As content of copper formate in the electrode forming composition of this Embodiment, 0.01 mass%-50 mass% are with respect to 100 mass% of all the components which the electrode forming composition of this Embodiment contains. Preferably, 0.1 mass%-30 mass% is more preferable. By setting the content of copper formate to 0.01% by mass to 50% by mass, a stable electrode-forming composition can be obtained, and a sensing electrode having excellent conductivity can be formed. If the content of copper formate is less than 0.01% by mass, a low resistance detection electrode may not be formed. Moreover, when content of copper formate exceeds 50 mass%, a stable electrode forming composition may not be obtained.

[Amine]
The amine that can be contained in the electrode forming composition of the present embodiment is an amine represented by at least one of the following general formulas (1), (2), and (3). is there.

In the general formula (1), R ¹ and R ² each independently represent a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. R ³ represents a single bond, a methylene group, an alkylene group having 2 to 12 carbon atoms, or a phenylene group. R ⁴ represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, an alicyclic hydrocarbon group having 3 to 18 carbon atoms, an amino group, a dimethylamino group, or a diethylamino group.

In the general formula (2), R ⁵ and R ⁶ each independently represent a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. R ⁷ represents a methylene group, an alkylene group having 2 to 12 carbon atoms, or a phenylene group. R ⁸ represents an alkyl group having 1 to 18 carbon atoms or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. However, when R ⁵ and R ⁶ are hydrogen atoms, R ⁸ represents a group other than a methyl group and an ethyl group.

In the general formula (3), R ⁹ and R ¹⁰ each independently represent a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. R ¹¹ represents a methylene group, an alkylene group having 2 to 12 carbon atoms, or a phenylene group. R ¹² and R ¹³ each independently represent an alkyl group having 1 to 18 carbon atoms or an alicyclic hydrocarbon group having 3 to 18 carbon atoms.

Examples of the groups R ¹ and R ² contained in the amine represented by the general formula (1) include a hydrogen atom and a linear alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, and pentyl. Group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, stearyl group, etc., and isopropyl group, sec-butyl group, isobutyl group, tert-butyl group as branched ones , Isopentyl group, neopentyl group, tert-pentyl group, 1-ethylpropyl group, 1,1-dimethylpropyl group, 1,2-dimethylpropyl group, 1,1,2-trimethylpropyl group, 1,2,2- Trimethylpropyl group, 1,3-dimethylbutyl group, neopentyl group, 1,5-dimethylhexyl group, 2-ethylhexyl group, 4-heptyl group, - heptyl group and the like, alicyclic hydrocarbon group, a cyclohexyl group, a cyclopentyl group.

Examples of the group R ⁴ contained in the amine represented by the general formula (1) include a hydrogen atom amino group, a dimethylamino group and a diethylamino group, as well as a linear alkyl group such as a methyl group and an ethyl group. Propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, stearyl group, etc., and isopropyl group, sec-butyl group as a branched one , Isobutyl group, tert-butyl group, isopentyl group, neopentyl group, tert-pentyl group, 1-ethylpropyl group, 1,1-dimethylpropyl group, 1,2-dimethylpropyl group, 1,1,2-trimethylpropyl Group, 1,2,2-trimethylpropyl group, 1,3-dimethylbutyl group, neopentyl group, 1,5-dimethylhexyl Group, 2-ethylhexyl group, 4-heptyl group, 2-heptyl group, and the like. Examples of the alicyclic hydrocarbon group include cyclohexyl group and cyclopentyl group.

  Specific examples of the amine represented by the general formula (1) include, for example, methylamine, ethylamine, propylamine, butylamine, pentylamine, hexylamine, heptylamine, octylamine, nonylamine, decylamine, undecylamine. , Dodecylamine, stearylamine, isopropylamine, sec-butylamine, isobutylamine, tert-butylamine, isopentylamine, neopentylamine, tert-pentylamine, 1-ethylpropylamine, 1,1-dimethylpropylamine, 1, 2-dimethylpropylamine, 1,1,2-trimethylpropylamine, 1,2,2-trimethylpropylamine, 1,3-dimethylbutylamine, neopentylamine, 1,5-dimethylhexylamine, 2- Hexyl amine, 4-heptyl amine, 2-heptyl amine, cyclohexylamine, cyclopentylamine, and the like.

Examples of the groups R ⁵ and R ⁶ contained in the amine represented by the general formula (2) include a hydrogen atom, and a linear alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, and pentyl. Group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, stearyl group, etc., and isopropyl group, sec-butyl group, isobutyl group, tert-butyl group as branched ones , Isopentyl group, neopentyl group, tert-pentyl group, 1-ethylpropyl group, 1,1-dimethylpropyl group, 1,2-dimethylpropyl group, 1,1,2-trimethylpropyl group, 1,2,2- Trimethylpropyl group, 1,3-dimethylbutyl group, neopentyl group, 1,5-dimethylhexyl group, 2-ethylhexyl group, 4-heptyl group, - heptyl group and the like, alicyclic hydrocarbon group, a cyclohexyl group, a cyclopentyl group.

Examples of the group R ⁸ contained in the amine represented by the general formula (2) include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, and a heptyl group as a linear alkyl group. Group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, stearyl group, etc., and isopropyl group, sec-butyl group, isobutyl group, tert-butyl group, isopentyl group, neopentyl group as branched ones , Tert-pentyl group, 1-ethylpropyl group, 1,1-dimethylpropyl group, 1,2-dimethylpropyl group, 1,1,2-trimethylpropyl group, 1,2,2-trimethylpropyl group, 1, 3-dimethylbutyl group, neopentyl group, 1,5-dimethylhexyl group, 2-ethylhexyl group, 4-heptyl group, 2-heptyl group, etc. Examples of the alicyclic hydrocarbon group include a cyclohexyl group and a cyclopentyl group. However, when R ⁵ and R ⁶ are both hydrogen atoms, R ⁸ is other than a methyl group or an ethyl group.

  Specific examples of the amine represented by the general formula (2) include, for example, propoxymethylamine, propoxyethylamine, isopropoxypropylamine, propoxypropylamine, propoxybutylamine, butoxymethylamine, butoxyethylamine, butoxypropylamine. , (Ethylhexyloxy) propylamine, isobutoxypropylamine, butoxybutylamine, oxybis (ethylamine) and the like.

Examples of the groups R ⁹ and R ¹⁰ contained in the amine represented by the general formula (3) include a hydrogen atom and a linear alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, and pentyl. Group, hexyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, stearyl group, etc., and isopropyl group, sec-butyl group, isobutyl group, tert-butyl group as branched ones , Isopentyl group, neopentyl group, tert-pentyl group, 1-ethylpropyl group, 1,1-dimethylpropyl group, 1,2-dimethylpropyl group, 1,1,2-trimethylpropyl group, 1,2,2- Trimethylpropyl group, 1,3-dimethylbutyl group, neopentyl group, 1,5-dimethylhexyl group, 2-ethylhexyl group, 4-heptyl group 2-heptyl group and the like, alicyclic hydrocarbon group, a cyclohexyl group, a cyclopentyl group.

Examples of the groups R ¹² and R ¹³ contained in the amine represented by the general formula (3) include, as a linear alkyl group, a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, and a hexyl group. Group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, stearyl group, and the like. Examples of branched groups include isopropyl group, sec-butyl group, isobutyl group, tert-butyl group, isopentyl group. , Neopentyl group, tert-pentyl group, 1-ethylpropyl group, 1,1-dimethylpropyl group, 1,2-dimethylpropyl group, 1,1,2-trimethylpropyl group, 1,2,2-trimethylpropyl group 1,3-dimethylbutyl group, neopentyl group, 1,5-dimethylhexyl group, 2-ethylhexyl group, 4-heptyl group, 2 Heptyl group and the like, alicyclic hydrocarbon group, a cyclohexyl group, a cyclopentyl group.

  Specific examples of the amine represented by the general formula (3) include aminoacetaldehyde diethyl acetal.

  The electrode forming composition of the present embodiment is selected from the group consisting of amines represented by at least one of the above general formula (1), general formula (2) and general formula (3). It is preferable to use one or a combination of two or more compatible with each other. These amines can be used as commercially available products, and the method for obtaining them is not particularly limited.

  Although it does not specifically limit about the purity of an amine, 95% or more is preferable so that it may be used in the electronic material field | area for the detection electrode formation of a touchscreen, and to reduce an impure content, 99 % Or more is more preferable.

  The content of the amine is preferably 0.1% by mass to 99.99% by mass with respect to 100% by mass of all components contained in the electrode forming composition of the present embodiment, and 1% by mass to 99.9% by mass. % Is more preferable, and 2% by mass to 70.0% by mass is more preferable. By setting the amine content to 0.1 mass% to 99.99 mass%, a copper film having excellent conductivity can be formed, and a low resistance detection electrode can be formed. By setting the amine content to 1% by mass to 99.9% by mass, a detection electrode having a lower resistance value can be formed. By setting it as 2 mass%-70.0 mass%, while forming the detection electrode of a low resistance value, the electrode formation composition excellent in productivity can be prepared.

〔solvent〕
In the electrode forming composition of the present embodiment, a solvent can be added as a component. By adding a solvent to the electrode-forming composition, the uniformity of the electrode-forming composition is improved, and a sensing electrode can be formed as a copper film having stable physical properties.

  The solvent to be added is not particularly limited as long as the above-described copper formate and amine are used as long as they are mixed and then dissolved and do not react with them. For example, in addition to one selected from water, alcohols, glycols, ethers, esters, aliphatic hydrocarbons and aromatic hydrocarbons, a compatible mixture of two or more of them may be mentioned.

  Regarding specific examples of the solvent, alcohols include methanol, ethanol, n-propyl alcohol (1-propanol), i-propyl alcohol, n-butyl alcohol (1-butanol), i-butyl alcohol, sec-butyl alcohol, Examples include pentanol, hexanol, heptanol, octanol, nonyl alcohol, decanol, cyclohexanol, benzyl alcohol, and terpineol.

  Examples of glycols include ethylene glycol, propylene glycol, butylene glycol, pentanediol, diethylene glycol, dipropylene glycol, triethylene glycol, and tripropylene glycol.

Also, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol mono-n-propyl ether, ethylene glycol mono-n-butyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol mono-n-propyl ether, diethylene glycol mono- n-butyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol mono-n-propyl ether, propylene glycol mono-n-butyl ether, dipropylene glycol monomethyl ether Dipropylene glycol Monoethyl ether, dipropylene glycol mono -n- propyl ether, dipropylene glycol mono -n- butyl ether, tripropylene glycol monomethyl ether, tripropylene glycol monoethyl (poly) alkylene glycol monoalkyl ethers such as ether;
Acetic acid ethylene glycol monomethyl ether, acetic acid ethylene glycol monoethyl ether, acetic acid ethylene glycol mono-n-propyl ether, acetic acid ethylene glycol mono-n-butyl ether, acetic acid diethylene glycol monomethyl ether, acetic acid diethylene glycol monoethyl ether, acetic acid diethylene glycol mono-n-propyl Acetic acid (poly) alkylene glycol monoalkyl ethers such as ether, diethylene glycol mono-n-butyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, 3-methoxybutyl acetate, 3-methyl-3-methoxybutyl acetate ;
Other ethers such as diethylene glycol dimethyl ether, diethylene glycol methyl ethyl ether, diethylene glycol diethyl ether, tetrahydrofuran;
Ketones such as methyl ethyl ketone, cyclohexanone, 2-heptanone, 3-heptanone, diacetone alcohol (4-hydroxy-4-methylpentan-2-one), 4-hydroxy-4-methylhexane-2-one;
Diacetates such as propylene glycol diacetate, 1,3-butylene glycol diacetate, 1,6-hexanediol diacetate;
Lactic acid alkyl esters such as methyl lactate and ethyl lactate;
Ethyl acetate, n-propyl acetate, i-propyl acetate, n-butyl acetate, i-butyl acetate, n-pentyl formate, i-pentyl acetate, 3-methoxybutyl acetate, 3-methyl-3-methoxybutyl acetate, N-butyl propionate, 3-methoxybutyl acetate, 3-methyl-3-methoxybutylpropionate, ethyl butyrate, n-propyl butyrate, i-propyl butyrate, n-butyl butyrate, ethyl hydroxyacetate, ethyl ethoxyacetate, Methyl 3-methoxypropionate, ethyl 3-methoxypropionate, methyl 3-ethoxypropionate, ethyl 3-ethoxypropionate, methyl pyruvate, ethyl pyruvate, n-propyl pyruvate, methyl acetoacetate, ethyl acetoacetate, Ethyl 2-hydroxy-2-methylpropionate, 2 Hydroxy-3-methyl-butyric acid methyl, other esters such as ethyl 2-oxobutyrate and the like.

  Examples of the aliphatic hydrocarbons include n-pentane, n-hexane, n-heptane, n-octane, n-nonane, n-decane, n-undecane, n-dodecane, cyclohexane, decalin and the like.

Examples of aromatic hydrocarbons include benzene, toluene, xylene, ethylbenzene, n-propylbenzene, i-propylbenzene, n-butylbenzene, mesitylene, chlorobenzene, dichlorobenzene and the like.
Furthermore, amides such as N-methylpyrrolidone, N, N-dimethylformamide, N, N-dimethylacetamide and the like can be mentioned.

  As a component of the electrode forming composition of the present embodiment, it is preferable to use one kind selected from the group consisting of these solvents, or two or more kinds compatible with each other.

  The content of the solvent contained in the electrode forming composition of the present embodiment is not particularly limited, but is 0% by mass to 95% by mass with respect to 100% by mass of all components contained in the electrode forming composition of the present embodiment. %, Preferably in the range of 0% to 90% by weight.

[Other optional ingredients]
The electrode-forming composition of the present embodiment is, for example, a copper salt that is copper formate, and a reducing agent that is, for example, an amine, as long as the effects of the present invention are not impaired. It is possible to contain an antioxidant, a concentration adjusting agent, a surface tension adjusting agent, a viscosity adjusting agent, and a coating film forming auxiliary agent.

  Other optional components are not particularly limited as long as they have desired characteristics. For example, it is possible to select from the solvents in which the above-mentioned components dissolve and do not react, and to contain them as other optional components. And the electrode formation composition can be prepared so that it may become a desired density | concentration, surface tension, and viscosity by adding the solvent.

  Although there is no restriction | limiting in particular in content of the other arbitrary component in the electrode forming composition of this Embodiment, 0 mass%-50 mass with respect to 100 mass% of all the components which the electrode forming composition of this Embodiment contains. % Is preferable, and a range of 0% by mass to 20% by mass is more preferable. Even if the content of other optional components is added so as to exceed 50% by mass, the effect of other optional components corresponding to the content cannot be obtained. Furthermore, the amount of metallic copper formed per unit weight of the electrode-forming composition may decrease, and a detection electrode having desired characteristics may not be formed with high production efficiency.

(Preparation of electrode forming composition)
[Adjustment method]
The electrode-forming composition of the present embodiment can be prepared by mixing a copper salt and a reducing agent, and when using the above-described copper formate and amine, they can be easily prepared by mixing them. . The order of mixing is not particularly limited.

  In the method for producing an electrode forming composition, it is possible to add a solvent as described above. As described above, the solvent to be added is not particularly limited as long as, for example, a copper salt that is copper formate and a reducing agent that is, for example, an amine are mixed and then dissolved and do not react with them. . As the solvent, for example, one selected from water, alcohols, glycols, ethers, esters, aliphatic hydrocarbons and aromatic hydrocarbons, or a compatible mixture of two or more types is added. It is possible.

  In the preparation of the electrode forming composition of the present embodiment, the above-described dispersant, antioxidant, concentration adjusting agent, surface tension adjusting agent, viscosity adjusting agent and the like can be added as other optional components. Other optional components can be added after mixing, for example, a copper salt that is copper formate and a reducing agent that is, for example, an amine. And other optional components are dissolved together with other components, for example, without reacting with copper formate used as a copper salt, the electrode forming composition of the present embodiment has a desired concentration, surface tension, viscosity, etc. Adjust so that

[Mixing method]
In the preparation of the electrode forming composition of the present embodiment, the mixing method is not particularly limited. For example, stirring with a stirring blade, stirring with a stirrer and a stirring bar, ultrasonic homogenizer, bead mill, paint shaker, stirring The mixing method using a defoaming apparatus etc. is mentioned.

Embodiment 3 FIG.
<Manufacturing method of touch panel>
The manufacturing method of the touch panel which is 3rd Embodiment of this invention is suitable for manufacture of the touch panel of 1st Embodiment which has a board | substrate and the detection electrode arrange | positioned on the board | substrate. And the manufacturing method of the touchscreen which is 3rd Embodiment includes the process of forming a detection electrode on a board | substrate using the electrode formation composition of 2nd Embodiment of this invention mentioned above as a main process. As the electrode forming composition, it is preferable to use copper formate which is copper carboxylate as a copper salt and amine as a reducing agent.
Hereinafter, the manufacturing method of the touch panel of this embodiment using the electrode formation composition containing copper formate and an amine is demonstrated.

  In the touch panel manufacturing method according to the third embodiment, as described above, the detection electrode can be formed on the substrate using the electrode forming composition of the second embodiment containing copper formate and an amine. That is, the electrode-forming composition of the second embodiment is applied onto a suitable substrate described later, and in the air (hereinafter also referred to as an air atmosphere) or in a non-oxidizing atmosphere under the temperature conditions described in detail later. By heating, a detection electrode made of copper can be easily formed as a copper film on the substrate.

  In the manufacturing method of the touch panel which is 3rd Embodiment, the bivalent copper ion contained in an electrode formation composition is heated by heating the coating film of the electrode formation composition of 2nd Embodiment apply | coated on the board | substrate. Reduced to form metallic copper. At the same time, the organic substances contained in the coating film are volatilized by heating or decomposed and then volatilized and removed. The copper film formed in this way can be used for the detection electrode of a touch panel, and by extension, is suitable for manufacturing a touch panel.

  From the above, the manufacturing method of the touch panel of the present embodiment includes [1] copper formate (or its hydrate), the following general formula (1), the following general formula (2), and the following general formula (3). And a step of forming a coating film of the electrode forming composition of the second embodiment on the substrate containing the amine represented by at least one of the following (hereinafter also referred to as [1] step).

（一般式（１）中、Ｒ^１、Ｒ^２は、それぞれ独立に水素原子、炭素数１から１８のアルキル基、または、炭素数３から１８の脂環式炭化水素基を示す。Ｒ^３は、単結合、メチレン基、炭素数２から１２のアルキレン基、または、フェニレン基を示す。Ｒ^４は、水素原子、炭素数１から１８のアルキル基、炭素数３から１８の脂環式炭化水素基、アミノ基、ジメチルアミノ基、または、ジエチルアミノ基を示す。）

(In General Formula (1), R ¹ and R ² each independently represent a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. R ³ represents , A single bond, a methylene group, an alkylene group having 2 to 12 carbon atoms, or a phenylene group, R ⁴ represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon having 3 to 18 carbon atoms. Group, amino group, dimethylamino group, or diethylamino group.)

（一般式（２）中、Ｒ^５、Ｒ^６は、それぞれ独立に水素原子、炭素数１から１８のアルキル基、または、炭素数３から１８の脂環式炭化水素基を示す。Ｒ^７は、メチレン基、炭素数２から１２のアルキレン基、または、フェニレン基を示す。Ｒ^８は、炭素数１から１８のアルキル基、または、炭素数３から１８の脂環式炭化水素基を示す。但し、Ｒ^５およびＲ^６が水素原子の場合、Ｒ^８はメチル基およびエチル基以外を示す。）

(In General Formula (2), R ⁵ and R ⁶ each independently represent a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. R ⁷ represents , A methylene group, an alkylene group having 2 to 12 carbon atoms, or a phenylene group, and R ⁸ represents an alkyl group having 1 to 18 carbon atoms or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. (However, when R ⁵ and R ⁶ are hydrogen atoms, R ⁸ represents a group other than a methyl group or an ethyl group.)

（一般式（３）中、Ｒ^９、Ｒ^１０は、それぞれ独立に水素原子、炭素数１から１８のアルキル基、または、炭素数３から１８の脂環式炭化水素基を示す。Ｒ^１１は、メチレン基、炭素数２から１２のアルキレン基、または、フェニレン基を示す。Ｒ^１２、Ｒ^１３は、それぞれ独立に、炭素数１から１８のアルキル基、または、炭素数３から１８の脂環式炭化水素基を示す。）

(In General Formula (3), R ⁹ and R ¹⁰ each independently represent a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. R ¹¹ represents , A methylene group, an alkylene group having 2 to 12 carbon atoms, or a phenylene group, R ¹² and R ¹³ each independently represents an alkyl group having 1 to 18 carbon atoms or an alicyclic ring having 3 to 18 carbon atoms. Represents a hydrocarbon group.)

  And the manufacturing method of the touch panel of this embodiment WHEREIN: After the [1] process, [2] In the air | atmosphere or non-oxidizing atmosphere, the electrode formation composition of 2nd Embodiment formed by the [1] process is used. A step of heating the coating film (hereinafter, also referred to as [2] step).

And in the manufacturing method of the touch panel of this embodiment, among the said General formula (1), the said General formula (2), and the said General formula (3) contained in the electrode formation composition used at a [1] process. The boiling point T _bp (° C.) of the amine represented by at least one and the temperature T (° C.) for heating the coating film in the step [2] satisfy the relationship represented by the following (Equation 1). [2] By providing such conditions for the heating of the coating film in the step, the touch panel manufacturing method of the present embodiment allows the substrate to be used even when the heating temperature in the step [2] is a relatively low temperature of 200 ° C. or lower. A low resistance detection electrode made of copper can be formed thereon. A touch panel having a low resistance detection electrode can be manufactured.

〔substrate〕
In the touch panel manufacturing method of the present embodiment, the substrate on which the coating film of the electrode forming composition of the second embodiment is formed in the step [1] constitutes a main component of the touch panel. Therefore, it is preferable to use a transparent substrate having visible light transparency. As such a transparent substrate, a transparent substrate made of a known transparent material can be used.

  A glass substrate can be used for the transparent substrate which is used in the manufacturing method of the touch panel of this embodiment, and comprises the principal part of a touch panel, for example. More specifically, a soda glass substrate, a borosilicate glass substrate, a silica glass substrate, a quartz glass substrate, and the like can be given.

  Moreover, such a transparent substrate can be a resin substrate. Examples of resin substrates include polyethylene terephthalate film, polybutylene terephthalate film, polyethylene film, polypropylene film, polyethersulfone film, polycarbonate film, polyacrylic film, polyvinyl chloride film, polyimide film, cyclic olefin ring-opening polymer film, and The film etc. which consist of a hydrogenated material can be mentioned.

[Coating method]
In the touch panel manufacturing method of the present embodiment, a known method can be used as a method of forming the coating film by applying the electrode forming composition of the second embodiment to the substrate in the step [1]. There is no limitation. Examples include gravure printing, flexographic printing, offset printing, inkjet printing, screen printing, dip coating, casting, bar coating, slit coating, spin coating, dispenser coating, etc. . Among them, there are coating methods that can easily pattern the coating film of the electrode forming composition so that the shape of the detection electrode of the touch panel becomes a desired one, such as a screen printing method, an ink jet printing, an offset printing, and a coating method with a dispenser. preferable. The amount of the electrode forming composition applied to the substrate can be appropriately adjusted according to the desired film thickness of the conductive film.

[Atmosphere and heating conditions for detection electrode formation]
In the manufacturing method of the touch panel of this embodiment, the heating for forming the detection electrode from the coating film of the electrode forming composition in the step [2] is reduction using a reducing gas such as hydrogen gas as described above. There is no particular need to carry out in an atmosphere, and it can be carried out in an air atmosphere or a non-oxidizing atmosphere. For example, the detection electrode can be formed on the substrate by heating the coating film of the electrode forming composition formed on the substrate in the step [1] in a nitrogen atmosphere.

  Examples of the non-oxidizing atmosphere include a nitrogen atmosphere, a helium atmosphere, and an argon atmosphere. Among these, a nitrogen atmosphere in which inexpensive nitrogen gas can be used is preferable, and it is preferable to form the detection electrode on the substrate by heating in a nitrogen atmosphere. That is, the electrode forming composition of the second embodiment is used to form a sensing electrode made of copper as a copper film by heating in a safe state without forming a reducing atmosphere using a reducing gas such as hydrogen gas. can do.

  [2] Regarding the heating temperature (T (° C)) of the coating film in the step, as described above, it may be a temperature at which the copper ions are reduced by the reducing agent and the organic substances are volatilized or decomposed. It is not limited. For example, the range of 50 degreeC-300 degreeC is preferable, and the range of 100 degreeC-250 degreeC is more preferable. When the detection electrode is to be formed on the substrate by heating at a low temperature, the amine component of the electrode forming composition can be suitably selected to be in the range of 50 ° C to 200 ° C, and 100 ° C to 200 ° C. It is preferable to set it as the range. If the heating temperature is less than 50 ° C, the reduction of copper formate does not proceed completely, and the remaining organic matter may become prominent. If the heating temperature exceeds 300 ° C, an organic substrate such as a resin substrate is used as the touch panel substrate. There is a risk that it will not be possible.

And the heating temperature (T (degreeC)) of the [2] process of the manufacturing method of the touch panel of this embodiment is boiling point _Tbp ( _degreeC ) of the amine contained in an electrode formation composition in said preferable temperature range. ) Is set so as to satisfy the above (Formula 1).

Moreover, in the manufacturing method of the touch panel of this embodiment, conversely, first, the heating temperature (T (° C.)) of the step [2] is determined within the above preferable range, and the boiling point satisfying the above (Equation 1) in accordance with it. The amine represented by at least one of the above general formula (1), the above general formula (2), and the above general formula (3) having (T _bp (° C.)) is selected. It can also be used for preparation. And it is possible to form a detection electrode on a board | substrate according to said each process using the electrode formation composition adjusted in that way, and to manufacture a touch panel.

  [2] The heating time in the step may be appropriately selected so that the conductivity (resistance value) of the formed detection electrode can be improved in consideration of the solvent type contained in the electrode forming composition. is not. And in a [2] process, when the low heating temperature of about 200 degreeC is set, it is preferable to set it as about 1 minute-30 minutes.

  After the step [2], after forming a low resistance detection electrode made of copper on the substrate, forming a protective film on the surface of the substrate on which the detection electrode is arranged so as to cover the detection electrode. Can be provided. About a protective film, it can be set as the protective film etc. which are described in Unexamined-Japanese-Patent No. 2010-434. That is, as described in Japanese Patent Application Laid-Open No. 2010-434, using a protective film-forming composition containing a polymer having a reactive functional group, the detection electrode is placed on the surface of the substrate on which the detection electrode is arranged. A coating film of the composition is formed so as to cover the film, and then the coating film is cured by means such as heating to form a protective film.

  By the touch panel manufacturing method of the present embodiment described above, a detection electrode having a desired shape made of copper and having excellent resistance characteristics can be formed on a substrate, and a touch panel provided with the detection electrode can be provided.

Hereinafter, embodiments of the present invention will be described more specifically based on examples. However, the present invention is not limited to these examples.
In this example, first, an electrode forming composition suitable for forming a detection electrode for a touch panel was prepared. And the copper electrode corresponding to the detection electrode of a touch panel was formed on the glass substrate using the obtained electrode formation composition, and the resistance characteristic was evaluated. Next, a touch panel was manufactured using a suitable electrode forming composition.

<Examples 1 to 40 and Comparative Examples 1 to 15>
(Preparation of electrode forming composition)
In Examples 1 to 40 and Comparative Examples 1 to 15, the components shown in Table 1, Table 2, and Table 3 were used in the amounts and blending amounts (in the table, indicated as the addition amount (wt%)). (Copper formate, an amine, and a solvent added as necessary) were mixed to prepare an electrode forming composition. "-" In the columns of Table 1, Table 2 and Table 3 indicates that the corresponding component was not used.

In Table 1, Table 2, and Table 3, the heating temperature when forming a copper electrode from the obtained electrode-forming composition (hereinafter also referred to as firing temperature. In each table, the firing temperature is described. ) And the firing atmosphere. A wide temperature range from a relatively low temperature of 120 ° C. to 300 ° C. is selected as the firing temperature. In Examples 1 to 40, the boiling point (abbreviated as boiling point in each table) (T _bp (° C.)) and heating temperature (firing temperature) ( T (° C.) satisfies the above-described relationship of (Equation 1).

  In Examples 1 to 40 and Comparative Examples 1 to 15, commercially available products were used for the copper formate, amine, and solvent used in the preparation of the electrode forming compositions. For copper formate, copper formate tetrahydrate was used.

[Formation of copper electrode]
In Examples 1 to 40 and Comparative Examples 1 to 15, the prepared electrode forming composition was used, and a bar coater was used on a 150-mm long and 150-mm square non-alkali glass substrate. Then, a uniform coating film was formed which was patterned into a rectangular shape having a length of 50 mm and a width of 100 mm. Next, as shown in Table 1, Table 2 and Table 3, without using a hot plate and the firing atmosphere as a reducing atmosphere using a reducing gas such as hydrogen gas, a nitrogen atmosphere (in each table) The temperature is shown in Table 1, Table 2, and Table 3. The glass substrate on which the above-mentioned coating film was formed was made into an air atmosphere (in each table, described as air). (In each table, it is shown as the firing temperature.) For 10 minutes. And the copper electrode was formed as a copper film patterned in the said shape whose film thickness is about 0.1 micrometer-about 20 micrometers.

[Evaluation]
[Volume resistance measurement]
In Examples 1 to 40 and Comparative Examples 1 to 15, copper electrodes were formed as described above using the prepared electrode forming compositions, and their specific resistance values (volume resistance value (μΩ · cm) ) Was evaluated. The specific resistance value was measured using a four-probe resistance measuring machine (trade name: Model sigma-5, NPS). The evaluation results are shown in Table 1, Table 2, and Table 3. In addition, "-" in the volume resistance value column in Table 3 indicates that the copper electrode was not formed or that conduction was not confirmed in the formed film.

As shown in Table 1 and Table 2, in Examples 1 to 40, a copper electrode can be formed using the prepared electrode forming composition, and the obtained copper electrode has a very low value. It was found to show a volume resistance value. Moreover, in Example 1- Example 40, it turned out that the prepared electrode formation composition can form a copper electrode of a low resistance value, without forming the reducing atmosphere using reducing gas, such as hydrogen gas.
Furthermore, in the case of Example 3 and Example 26, the prepared electrode forming composition can form a copper electrode by firing in an air atmosphere (in the atmosphere), and the obtained copper electrode has a low value. It was found that the volume resistivity value was shown.

  In particular, in the case of Example 1 to Example 28, the prepared electrode forming composition can form a copper electrode at a heating temperature (firing temperature) of 200 ° C. or less, and the obtained copper electrode is very It was found that the volume resistance value was low. In the case of Examples 1 to 28, it was found that the prepared electrode forming composition can form a low resistance copper electrode by heating at a relatively low temperature. That is, in the case of Examples 1 to 28, it was found that the prepared electrode forming composition was particularly suitable for forming a detection electrode on a resin substrate to constitute a touch panel.

  In the case of Example 11, Example 25 and Example 26, the firing temperature of the prepared electrode forming composition was set lower than the boiling point of the amine contained in the electrode forming composition. It has been found that a copper electrode can be formed. In other examples, the firing temperature of the electrode-forming composition was set higher than the boiling point of the amine contained in the electrode-forming composition, but it was found that a low-resistance copper electrode can be formed.

  As shown in Table 3, in Comparative Example 1, it was found that the prepared electrode forming composition did not contain an amine, and as a result, a copper electrode could not be formed.

Moreover, in Comparative Example 2 to Comparative Example 11, the boiling point (amine boiling point) (T _bp (° C.)) of the amine contained in each prepared electrode forming composition and the heating temperature (firing temperature) for forming the copper electrode ( (T (° C.)) does not satisfy the relationship of (Equation 1) described above, and it has been found that a copper electrode having a low resistance value cannot be formed, or even if the resistance can be reduced, it is inferior to the example. . In particular, it was found that Comparative Example 4, Comparative Example 6, Comparative Example 7 and Comparative Example 11 were inferior to the Examples even though each electrode-forming composition was fired at a high firing temperature.

  Furthermore, in Comparative Example 12 to Comparative Example 15, the amine contained in each prepared copper film forming composition is the above-mentioned general formula (1), the above general formula (2), and the above general formula (3). It was found that the copper electrode formed was inferior to the examples even when the resistance of the formed copper electrode was lowered.

<Example 41>
[Manufacture of touch panels]
Using the electrode-forming composition prepared in Example 2, the substrate was applied to the surface of a square alkali-free glass substrate having a length of 150 mm and a width of 150 mm using a screen printing method, and patterned into a plurality of lines. A uniform coating was formed. Next, using a hot plate, the firing atmosphere was changed to a nitrogen atmosphere, and the glass substrate on which the aforementioned coating film was formed was heat-treated at 120 ° C. for 10 minutes. Then, a first detection electrode was formed as a patterned copper electrode on the surface of the substrate. Next, using the same electrode forming composition, a second detection electrode was formed as a copper electrode patterned on the back surface of the substrate by the same method as described above, and a touch panel was manufactured. The touch panel manufactured in this way has the same structure as the touch panel 1 shown in FIGS.

  Next, using the manufactured touch panel, the ends of the first detection electrode and the second detection electrode were connected to an external control circuit for detecting the position of the touch operation. Then, the capacitance is measured in the operation region where the first detection electrode and the second detection electrode are arranged in a matrix, and from the change in capacitance that occurs when there is a touch operation such as an operator's finger, The presence or absence of touch operation was confirmed, and the position of the touch operation was also confirmed.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. For example, with respect to the structure of the touch panel, it has been possible to replace the conventional structure using a transparent detection electrode such as ITO with the line-shaped detection electrode made of copper according to the present invention. A touch panel having a structure can be provided.

  The touch panel of the present invention is configured using a low resistance detection electrode made of a metal material without using a conventional electrode made of a high resistance and low transmittance material made of ITO or the like. Therefore, it can be used as an input device for a display of a portable small electronic device, or as a highly reliable input device for a display of a stationary large electronic device, which is difficult to use an electrode made of conventional ITO or the like. Can also be suitably used.

1, 11, 21, 100 Touch panel 2, 12, 22, 101 Substrate 3, 13, 23, 102 First sensing electrode 4, 14, 24, 103 Second sensing electrode 17, 27 Insulating layer

Claims (10)

A substrate,
A touch panel having a detection electrode disposed on the substrate,
The sensing electrode is
A touch panel formed using an electrode forming composition comprising (A) a copper salt and (B) a reducing agent.   The touch panel according to claim 1, wherein the substrate is a resin substrate. The sensing electrode is
(A) The electrode forming composition using (A-1) copper formate or a hydrate thereof as the copper salt, (B) using (B-1) amine as the reducing agent,
(B-1) The touch panel according to claim 1, wherein the touch panel is formed by heating at a temperature T (° C.) having a relation of the following formula with a boiling point T _bp (° C.) of the amine.

(B-1) The touch panel according to claim 3, wherein the amine is represented by at least one of the following general formula (1), the following general formula (2), and the following general formula (3). .

(In General Formula (1), R ¹ and R ² each independently represent a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. R ³ represents , A single bond, a methylene group, an alkylene group having 2 to 12 carbon atoms, or a phenylene group, R ⁴ represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon having 3 to 18 carbon atoms. Group, amino group, dimethylamino group, or diethylamino group.)

(In General Formula (2), R ⁵ and R ⁶ each independently represent a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. R ⁷ represents , A methylene group, an alkylene group having 2 to 12 carbon atoms, or a phenylene group, and R ⁸ represents an alkyl group having 1 to 18 carbon atoms or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. (However, when R ⁵ and R ⁶ are hydrogen atoms, R ⁸ represents a group other than a methyl group or an ethyl group.)

(In General Formula (3), R ⁹ and R ¹⁰ each independently represent a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. R ¹¹ represents , A methylene group, an alkylene group having 2 to 12 carbon atoms, or a phenylene group, R ¹² and R ¹³ each independently represents an alkyl group having 1 to 18 carbon atoms or an alicyclic ring having 3 to 18 carbon atoms. Represents a hydrocarbon group.)   The touch panel according to claim 1, wherein the electrode forming composition further includes (C) a solvent.   Content of (A-1) copper formate or its hydrate of the said electrode formation composition is 0.01 mass%-50 mass% of all the components, The any one of Claims 3-5 characterized by the above-mentioned. The touch panel according to item 1. (A-1) forming a coating film of an electrode forming composition containing copper formate or a hydrate thereof and (B-1) amine on a substrate;
(B-1) A step of forming the detection electrode by heating the coating film in the air or in a non-oxidizing atmosphere at a temperature T (° C.) having a relationship of the following formula with the boiling point T _bp (° C.) of the amine. A method for manufacturing a touch panel, comprising:

(B-1) The touch panel according to claim 7, wherein the amine is represented by at least one of the following general formula (1), the following general formula (2), and the following general formula (3). Manufacturing method.

(In General Formula (1), R ¹ and R ² each independently represent a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. R ³ represents , A single bond, a methylene group, an alkylene group having 2 to 12 carbon atoms, or a phenylene group, R ⁴ represents a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon having 3 to 18 carbon atoms. Group, amino group, dimethylamino group, or diethylamino group.)

(In General Formula (2), R ⁵ and R ⁶ each independently represent a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. R ⁷ represents , A methylene group, an alkylene group having 2 to 12 carbon atoms, or a phenylene group, and R ⁸ represents an alkyl group having 1 to 18 carbon atoms or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. (However, when R ⁵ and R ⁶ are hydrogen atoms, R ⁸ represents a group other than a methyl group or an ethyl group.)

(In General Formula (3), R ⁹ and R ¹⁰ each independently represent a hydrogen atom, an alkyl group having 1 to 18 carbon atoms, or an alicyclic hydrocarbon group having 3 to 18 carbon atoms. R ¹¹ represents , A methylene group, an alkylene group having 2 to 12 carbon atoms, or a phenylene group, R ¹² and R ¹³ each independently represents an alkyl group having 1 to 18 carbon atoms or an alicyclic ring having 3 to 18 carbon atoms. Represents a hydrocarbon group.)   The said electrode formation composition further contains (C) solvent, The manufacturing method of the touch panel of Claim 7 or 8 characterized by the above-mentioned.   The content of (A-1) copper formate or a hydrate thereof in the electrode forming composition is 0.01% by mass to 50% by mass of all components. The manufacturing method of the touch panel of Claim 1.

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