JP2003271312A - Transparent electrode board for touch panel and touch panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transparent electrode board for a touch panel having a resin substrate whose heat-resistivity, transparency, and thin film adhesiveness are excellent. <P>SOLUTION: This transparent electrode board for a touch panel is provided with a transparent substrate and a transparent conductive film formed on at least one surface of the transparent substrate, and the transparent substrate is composed of a copolymer (A) 80 to 98 mass part constituted of mono-ethylene unsaturated monomer unit 12.5 to 65 mass % containing methacrylic acid alkyl ester units having an alkyl group whose carbon number is 1 to 4 and polyfunctional (meta)acrylate units 35-87.5 mass % having at least two (meta) acryloil group and a (co)polymer (B) 2 to 20 mass part constituted of mono- ethylene unsaturated monomer units containing methacrylic acid alkyl ester units having an alkyl group whose carbon number is 1 to 4. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to heat resistance, transparency,
The present invention relates to a transparent electrode plate for a touch panel having a transparent substrate having excellent adhesion to a conductive film and a touch panel including the transparent electrode plate.

[0002]

2. Description of the Related Art A display device integrated input device in which a transparent touch panel is arranged on a display device such as a liquid crystal or a cathode ray tube is
By touching the display screen with an input pen or a finger, the touch panel acts as an input device and can easily perform input operations, so it is used as an operation screen for automated teller machines such as personal digital assistants and banks. There is. In particular, the resistance film type analog touch panel is most widely used because it can be applied to any operation screen.

A resistance film type analog touch panel generally comprises an upper transparent electrode plate and a lower transparent electrode plate, and the upper and lower transparent electrode plates are a transparent substrate and a transparent conductive film formed on the transparent substrate. And a transparent electrode plate having a structure in which an upper transparent electrode plate and a lower transparent electrode plate are arranged at intervals so that their transparent conductive films face each other.

When the upper transparent electrode plate of the touch panel having such a structure is pressed by the input pen or finger, the upper transparent electrode plate is bent and the transparent conductive films of the upper and lower transparent electrode plates come into contact with each other at the pressing point. . Then, the coordinates of the contact point are detected by measuring the electric resistance, and the input information is read.

As a transparent electrode plate of such a touch panel, generally, a resin plate is used for the upper transparent electrode plate, and a glass plate or a resin plate is used for the lower transparent electrode plate as a transparent substrate. A transparent conductive film formed by a vacuum film forming method such as a vacuum vapor deposition method, a sputtering method, a CVD (chemical vapor deposition) method or an ion plating method has been used.

[0006]

However, a lower electrode plate using a glass plate as a transparent substrate is liable to break during assembly and transportation of a touch panel or when pressed with a pen or hand, and it is difficult to make it thinner. However, there is a problem that it is difficult to reduce the weight.

On the other hand, when the resin plate is used as the transparent substrate, the problems of damage to the substrate, thinning and weight reduction, which occur when the glass plate is used as the transparent substrate, can be easily solved. In fact, various studies have been made on upper and lower electrode plates using a resin plate as a transparent substrate (Japanese Patent Laid-Open No. 2000-27).
6301, JP 2001-14951 A and JP 2001 A1
No. 34418, etc.). However, the transparent substrates using resin plates such as polyethylene terephthalate resin disclosed in these publications have insufficient transparency. In addition, due to lack of heat resistance, it is easily deformed by heat when forming a transparent conductive film on a transparent substrate, and the adhesiveness of the transparent conductive film is low and the durability is insufficient. There was a problem that it was necessary to further process.

Japanese Patent Publication No. 5-6570 discloses a methacrylic resin molding material obtained by polymerizing methyl methacrylate and neopentyl glycol dimethacrylate, which is a polyfunctional (meth) acrylate, as monomers. However, Japanese Patent Publication No. 5-6570 does not disclose that this methacrylic resin molding material can be used as a transparent substrate of a transparent electrode plate for a touch panel, and this limited composition is suitable as a transparent electrode plate for a touch panel. Is not suggested. Furthermore, Japanese Patent Fair 5-65
The methacrylic resin molding material described in Japanese Patent Publication No. 70 has a low polymerization rate of 4 to 62% by mass. Therefore, when the molding material is used as a product, the polymerization rate is further increased by steps such as compression molding and extrusion molding. It is necessary. Therefore, there is a problem that distortion occurs and the touch panel cannot be used.

Therefore, an object of the present invention is to solve the above problems and provide a transparent electrode plate for a touch panel having a resin substrate excellent in heat resistance, transparency and thin film adhesion, and a touch panel including the transparent electrode plate. It is in.

[0010]

The gist of the present invention is a transparent electrode plate for a touch panel having a transparent substrate and a transparent conductive film formed on at least one surface of the transparent substrate. Is a polyfunctional having 12.5 to 65% by mass of a monoethylenically unsaturated monomer unit containing a methacrylic acid alkyl ester unit having an alkyl group having 1 to 4 carbon atoms and 2 or more (meth) acryloyl groups. Monoethylenic unsaturated containing 80-98 parts by mass of a copolymer (A) consisting of 35-87.5% by mass of (meth) acrylate unit and a methacrylic acid alkyl ester unit having an alkyl group of 1 to 4 carbon atoms. A transparent electrode plate for a touch panel, which is a transparent substrate composed of 100 parts by mass of a resin composition composed of 2 to 20 parts by mass of a (co) polymer (B) composed of a monomer unit. With the transparent substrate having such a composition, the transparent conductive film has high adhesion and a transparent electrode plate can be produced without processing the transparent substrate surface.

Further, the gist of the present invention comprises an upper transparent electrode plate and a lower transparent electrode plate, wherein the upper transparent electrode plate and the lower transparent electrode plate are formed on a transparent substrate and on at least one surface of the transparent substrate. A transparent electrode plate having a transparent conductive film formed thereon, wherein the upper transparent electrode plate and the lower transparent electrode plate are arranged at a distance such that their transparent conductive films face each other. In the touch panel, at least one of the upper transparent electrode plate and the lower transparent electrode plate is the transparent electrode plate for a touch panel.

The transparent electrode plate for a touch panel preferably has a deflection temperature under load of 150 ° C. or higher.

The polyfunctional (meth) acrylate unit is preferably a compound represented by the following general formula (1).

[0014]

[Chemical 2] (In the formula, R ¹ and R ² are H or CH ₃ , R ³ and R ⁴ are H or a hydrocarbon group having a carbon number of 3 or less, and n is an integer of 0 to 4.) Also, the carbon number is 1 to 4 The methacrylic acid alkyl ester unit having an alkyl group is preferably a methyl methacrylate unit.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The transparent electrode plate for a touch panel of the present invention has a transparent substrate and a transparent conductive film formed on at least one surface of this transparent substrate. For example, as shown in FIG. 1, the transparent electrode plate for a touch panel of the present invention (1)
Has a transparent substrate (2) and a transparent conductive film (3) provided on the transparent substrate.

<Transparent Substrate> The transparent substrate constituting the transparent electrode plate for a touch panel of the present invention is a monoethylenically unsaturated monomer unit containing a methacrylic acid alkyl ester unit having an alkyl group having 1 to 4 carbon atoms. 5 to 65 mass%
And 80 to 98 parts by mass of a copolymer (A) composed of 35 to 87.5% by mass of a polyfunctional (meth) acrylate unit having 2 or more (meth) acryloyl groups, and 1 to 4 carbon atoms.
2 to 20 parts by mass of a (co) polymer (B) consisting of a monoethylenically unsaturated monomer unit containing an methacrylic acid alkyl ester unit having an alkyl group.

The content of the monoethylenically unsaturated monomer unit containing a methacrylic acid alkyl ester unit having an alkyl group having 1 to 4 carbon atoms is 12.5 in the copolymer (A).
Is in the range of to 65% by mass. When it is 12.5% by mass or more, transparency is improved, and when it is 65% by mass or less, heat resistance tends to be improved. It is preferably 55% by mass or less.

Examples of the alkyl methacrylate unit having an alkyl group having 1 to 4 carbon atoms include methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, i-butyl methacrylate. , T-butyl methacrylate and the like. These can also be used in combination. Of these, methyl methacrylate is particularly preferable.

Content of methacrylic acid alkyl ester units having an alkyl group having 1 to 4 carbon atoms in the total amount of monoethylenically unsaturated monomer units containing methacrylic acid alkyl ester units having an alkyl group having 1 to 4 carbon atoms Is 50
It is preferably at least mass%.

Monoethylenically unsaturated monomer units other than the methacrylic acid alkyl ester units having an alkyl group having 1 to 4 carbon atoms include styrene, α-methylstyrene, acrylonitrile, acrylic acid, methacrylic acid and methyl acrylate. , Ethyl acrylate, n-butyl acrylate, 2-ethylhexyl methacrylate, lauryl methacrylate, tridecyl methacrylate, stearyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, isobornyl methacrylate, glycidyl methacrylate, tetrahydrofurfuryl methacrylate. , 2-hydroxyethyl methacrylate, hydroxypropyl methacrylate, methoxyethyl methacrylate, ethoxyethyl methacrylate and the like. These can also be used in combination.

The content of the monoethylenically unsaturated monomer unit other than the methacrylic acid alkyl ester unit having a C1-4 alkyl group is the methacrylic acid alkyl ester unit having a C1-4 alkyl group. It is preferably 50% by mass or less in the total amount of monoethylenically unsaturated monomer units contained. 20% by mass of a monoethylenically unsaturated monomer unit other than a methacrylic acid alkyl ester unit having an alkyl group having 1 to 4 carbon atoms with respect to a mixture of the copolymer (A) and the (co) polymer (B). It is preferable for it to be as follows because it is possible to obtain sufficient transparency as a transparent electrode plate for a touch panel and also sufficient heat resistance.

The polyfunctional (meth) acrylate unit having two or more (meth) acryloyl groups in the present invention means a polyfunctional acrylate unit having two or more acryloyl groups or a polyfunctional acrylate unit having two or more methacryloyl groups. It is a functional methacrylate unit. These can also be used together. These are preferably compounds represented by the general formula (1).

As the compound represented by the general formula (1),
Ethylene glycol dimethacrylate, ethylene glycol diacrylate, 1,3-propanediol dimethacrylate, 1,3-propanediol diacrylate, 1,4-butylene glycol dimethacrylate,
1,6-hexanediol dimethacrylate, 2-methyl-1,3-propanediol dimethacrylate, neopentyl glycol dimethacrylate, neopentyl glycol diacrylate, 2,2′-dimethyl-1,4
-Butanediol dimethacrylate and the like. Neopentyl glycol dimethacrylate is most preferable from the viewpoint of improving transparency. In the general formula (2),
When n is 1 or more, the appearance tends to be good, and when n is 4 or less, the heat resistance tends to be improved. These can be used in combination.

The content of the polyfunctional (meth) acrylate unit is in the range of 35 to 87.5 mass% in the copolymer (A), preferably in the range of 45 to 87.5 mass%. When the polyfunctional (meth) acrylate unit is 35% by mass or more, heat resistance is improved, and when it is 87.5% by mass or less, the appearance tends to be good.

The (co) polymer (B) consisting of a monoethylenically unsaturated monomer unit containing a methacrylic acid alkyl ester unit having an alkyl group having 1 to 4 carbon atoms means two or more (meth) acryloyl groups. It does not contain a polyfunctional (meth) acrylate unit having a group and has 1 to 1 carbon atoms.
Homopolymer (B) of a methacrylic acid alkyl ester having an alkyl group of 4 or a methacrylic acid alkyl ester having an alkyl group of 1 to 4 carbon atoms and a copolymer with a monoethylenically unsaturated monomer copolymerizable therewith It is a polymer (B). (This homopolymer (B) or copolymer (B) is appropriately referred to as "(co) polymer (B)")
The content of the methacrylic acid alkyl ester unit in the (co) polymer (B) is preferably 50% by mass or more.

Examples of the methacrylic acid alkyl ester unit having an alkyl group having 1 to 4 carbon atoms include those mentioned above.

Examples of the monoethylenically unsaturated monomer unit other than the methacrylic acid alkyl ester unit having an alkyl group having 1 to 4 carbon atoms include those mentioned above.

The transparent substrate in the transparent electrode plate for a touch panel of the present invention is a resin comprising 80 to 98 parts by mass of the above-mentioned copolymer (A) and 2 to 20 parts by mass of the above-mentioned (co) polymer (B). It is a transparent substrate composed of 100 parts by mass of the composition. When the (co) polymer (B) is 2 parts by mass or more, the appearance is improved, and when it is 20 parts by mass or less, the heat resistance tends to be improved.

The transparent electrode plate for a touch panel preferably has a deflection temperature under load of 150 ° C. or higher. When the deflection temperature under load is 150 ° C. or higher, the resin substrate tends not to be easily deformed when the silver paste is cured. The deflection temperature of the transparent electrode plate under load is 1 μm when the thickness of the transparent conductive film is 1 μm.
In the following thin cases, the deflection temperature under load of the transparent substrate that constitutes the transparent electrode plate is the same, and the deflection temperature under load of the transparent substrate may be measured and used as the deflection temperature under load of the transparent electrode plate.

<Manufacturing Method of Transparent Substrate> As a manufacturing method of the transparent substrate constituting the transparent electrode plate for a touch panel of the present invention, a manufacturing method by bulk polymerization can be mentioned. Preferably, it is suitable to produce the transparent substrate of the present invention by casting polymerization in which polymerization and molding are simultaneously performed. Casting polymerization is generally a method in which a polymerizable mixture is injected into a mold to polymerize, and the resulting polymer is peeled from the mold to obtain a product. The method of casting polymerization using methyl methacrylate as the methacrylic acid alkyl ester having an alkyl group having 1 to 4 carbon atoms is illustrated below, but is not limited thereto.

First, methyl methacrylate, a (co) polymer (B) containing a methyl methacrylate unit, a polyfunctional (meth) acrylate, and, if necessary, another copolymerizable monoethylenically unsaturated monomer are added. Put in a suction bottle and stir to obtain a polymerizable mixture. After adding a polymerization initiator to the polymerizable mixture, vacuum deaeration is performed, and the mixture is poured into a mold constituted by sandwiching a gasket between a pair of tempered glass sheets, put in a heating furnace, and heated at 40 to 70 ° C. for 2 to 2. 5 hours, 100
A resin plate that can be used as a resin substrate can be obtained by polymerizing and curing at ˜150 ° C. for 1 to 6 hours and peeling from the mold.

Here, a known polymerization initiator can be used as the polymerization initiator. Examples of the polymerization initiator that can be used in the present invention include t-butylperoxypivalate, t-hexylperoxypivalate, t-butylperoxyneodecanoate, t-hexylperoxyneodecanoate, 2,2 ′. -Azobis (4-methoxy-2,4-dimethylvaleronitrile), 2,2'-azobis (2,4-dimethylvaleronitrile) and 2,2 '
-Azobisisobutyronitrile, t-butyl peroxy isopropyl carbonate, etc. are mentioned. These can also be used in combination.

The amount of the polymerization initiator is preferably 0.001 to 1 part by mass, more preferably 0.01 to 0.5% by mass, based on 100 parts by mass of the polymerizable mixture.

In place of the tempered glass sheet, the mirror surface S
US sheet, glass sheet with fine irregularities on the surface,
It is also possible to use a mirror-finished SUS endless belt running opposite to each other as a mold. Further, the polymerization temperature and time can be appropriately selected.

In the polymerizable mixture, if necessary, a colorant, a release agent, an antioxidant, a stabilizer, an antistatic agent, an antibacterial agent, a flame retardant, an impact modifier, a light stabilizer, and an ultraviolet ray. Absorbent,
A light diffusing agent, a polymerization inhibitor, a chain transfer agent, a polymerization regulator or the like can be added.

<Transparent Conductive Film> The transparent electrode plate for a touch panel of the present invention comprises a transparent conductive film formed on at least one surface of the transparent substrate. Here, the transparent conductive film may be a transparent and conductive thin film, and for example, an inorganic thin film and an organic polymer thin film are used.

Examples of the material used for the inorganic thin film include transparent metal oxides such as tin oxide, indium oxide, and tin-added indium oxide (hereinafter abbreviated as ITO). Among them, ITO is preferable.

Further, examples of the material used for the organic polymer thin film include polyisothianaphthene.

<Transparent Electrode Plate for Touch Panel> The transparent electrode plate for a touch panel of the present invention has the above transparent substrate and a transparent conductive film formed on at least one surface of this transparent substrate. As a method of forming the transparent conductive film on the transparent substrate, a known film forming method can be used, and examples thereof include a vacuum vapor deposition method, a sputtering method, and a CVD method.
And various vacuum film forming methods such as an ion plating method. For example, the film formation of the ITO thin film by the sputtering method is performed as follows. First, in the cleaning step, the transparent substrate is washed with water (pure water) or alkaline water and dried in the atmosphere at a temperature of 120 ° C. or higher, preferably 120 to 130 ° C. for 1 to 4 hours. Then, under vacuum, 100 to 1
The ITO is sputtered at a temperature of 40 ° C., preferably 120 ° C. After that, the electrodes and the lead electrodes are coated with a silver paste and cured at a temperature of 130 to 170 ° C., preferably 150 ° C. At this time, if the heat resistance of the transparent substrate used is not sufficient, the resin substrate is deformed and cannot be used as a transparent electrode plate for a touch panel.

The thickness of the transparent substrate used for the transparent electrode plate for a touch panel of the present invention is, for example, 0.1 to 2 mm, preferably 0.2 to 1 mm.

The thickness of the transparent conductive film used in the transparent electrode plate for a touch panel of the present invention is, for example, 10-5.
Suitably it is 0 nm, preferably 25-40 nm.

A transparent electrode plate for a touch panel within such a range is preferable because it can be made lighter and thinner than a transparent electrode plate using a glass substrate.

The resin substrate forming the transparent electrode plate for a touch panel of the present invention is preferably uncolored. Further, an antireflection film can be formed on the side without the transparent conductive film.

When the thickness of the transparent electrode plate for a touch panel of the present invention is 1 mm, its total light transmittance is JIS-K.
7105 is a value based on the measuring method of total light transmittance shown in 7105, and is 91% or more, for example, 91 to 95%, preferably,
It is preferably 92 to 95%. Total light transmittance is 9
If it is 1% or more, sufficient transparency can be obtained as a transparent electrode plate for a touch panel.

<Touch Panel> An example of a touch panel in which the transparent electrode plate for a touch panel of the present invention is preferably used will be described below with reference to FIGS.

The touch panel of the present invention comprises a lower transparent electrode plate.
It has a structure in which (1) and the upper transparent electrode plate (7) are opposed to each other with a spacer (6) interposed therebetween. Lower transparent electrode plate (1)
Has a transparent substrate (2), a transparent conductive film (3) formed on the transparent substrate (2), and an electrode (4) at the end of the transparent conductive film (3). The lead electrode (5) is connected to the electrode (4). The upper transparent electrode plate (7) also has the same structure as the lower transparent electrode plate (1). Next, the lower transparent electrode plate (1) and the upper transparent electrode plate (7) are placed with the lower transparent conductive film (3) and the upper transparent conductive film (9) inside, and a dot spacer (11) is placed between both transparent electrode plates. ) Is interposed, and the electrodes are arranged at regular intervals with a spacer (6) so that the directions of the electrodes intersect. In the touch panel having such a configuration, when the upper transparent electrode plate (7) is pressed with a pen or a finger, the upper transparent electrode plate (7) is deformed and the lower transparent conductive film (3) and the upper transparent conductive film (7) are The membrane (9) is brought into contact and the input is completed.

The touch panel transparent electrode plate of the present invention is used as the lower transparent electrode plate (1) and / or the upper transparent electrode plate (7). Since the transparent electrode plate for a touch panel of the present invention has high transparency and high rigidity, it is suitable to be used as the lower transparent electrode plate (1).

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto.

[0049]

EXAMPLES The present invention will be described in detail below with reference to examples. The heat resistance was measured on the transparent substrate according to the measuring method of deflection temperature under load shown in JIS-K7207.

<Production of Transparent Substrate> [Example 1] Mixture 5 consisting of 7.5% by mass of methyl methacrylate polymer and 92.5% by mass of methyl methacrylate.
0 parts by mass, neopentyl glycol dimethacrylate 5
0 part by mass, 2,2'-azobis (2,2 as a polymerization initiator
4-dimethyl-4-methoxyvaleronitrile) 0.03
Parts by mass, t-hexylperoxypivalate 0.01 parts by mass, t-butylperoxyisopropyl carbonate 0.01 parts by mass, terpinolene 0.0 as a polymerization regulator.
05 parts by mass were mixed, charged into a suction bottle, stirred, and vacuum deaerated to obtain a polymerizable mixture. Next, after pouring the polymerizable mixture into a mold constituted by sandwiching a gasket between a pair of tempered glass sheets having a gap of 1.7 mm to remove air bubbles,
In a heating furnace, polymerization was carried out at 55 ° C. for 1 hour, 50 ° C. for 1 hour, and then 130 ° C. for 2 hours to produce a resin plate having a thickness of 1 mm. After cooling, the resin plate was peeled off and taken out. This resin plate, that is, the transparent substrate has a deflection temperature under load of 185 ° C.
Met. Table 1 shows a part of the raw material composition and the deflection temperature under load.

[0051]

[Table 1] [Example 2, Comparative Example 1] A resin plate was produced in the same manner as in Example 1 except for the composition of the raw materials shown in Table 1. Table 1 shows a part of the raw material composition and the deflection temperature under load.

<Manufacture of transparent electrode plate for touch panel> The transparent substrates obtained in Examples 1, 2 and Comparative Example 1 were washed with pure water, placed in a hot air drying oven and kept at 120 ° C. in the atmosphere for 2 hours.
Dried for hours. Next, an ITO film was formed on the resin substrate by a sputtering method to form a transparent conductive film. The film thickness was adjusted to about 30 nm. Sputtering has a mass ratio of 95
Targeting / 5 In ₂ O ₃ / SnO ₂
^The air was evacuated to ⁻³ Pa, and RF sputtering was performed under heating at 120 ° C. using argon / oxygen with a volume ratio of 92.5 / 7.5 as an introduced gas. Next, the electrodes and the lead electrodes were coated with silver paste and cured under heating at 150 ° C. The film thickness of the electrode and the lead electrode was adjusted to about 10 μm. As described above, a transparent electrode plate for a touch panel was obtained.

[Evaluation] 1) Observation with the naked eye Drying for 2 hours in the production of the transparent conductive film, film formation by the sputtering method, deformation of the transparent substrate after curing the silver paste, and ITO film formed This condition was visually observed to evaluate the appearance of the transparent electrode plate for touch panel. The state of the formed ITO film was judged to be good when no optical distortion or crack was observed, and was judged to be defective when optical distortion or crack was observed.

2) Evaluation of Transparency With respect to each transparent electrode plate for a touch panel manufactured by using the transparent substrate of Example 1, Example 2 and Comparative Example 1, the total light transmittance was measured to evaluate the transparency. The total light transmittance is J
It measured based on the measuring method of the total light transmittance shown by IS-K7105. It can be said that the larger the total light transmittance, the higher the transparency and the better the transparent electrode plate for a touch panel.

3) Evaluation of Adhesion With respect to each transparent electrode plate for a touch panel manufactured by using the transparent substrate of Example 1, Example 2 and Comparative Example 1, the adhesion of the transparent conductive film was evaluated. First, using a cutter 1
11 grids each having 11 rows and 11 columns were formed at intervals of mm so as to reach the resin substrate, and 100 squares of 1 × 1 mm were prepared. Adhesive tape (cellophane tape made by Nichiban) was closely adhered onto the squares, and the tape was rapidly peeled off by 45 °. At this time, the number (n) of the squares that remained without peeling off the transparent conductive film was expressed as n / 100. The value of n is
It is suitable that the number is preferably 96 or more, and more preferably 100. It can be said that the larger the value of n, the higher the adhesion of the transparent conductive film and the better the transparent electrode plate for a touch panel.

Table 1 shows the results of these evaluations.

<Touch Panel> The touch panel shown in FIG. 3 was produced and the operability of the touch panel was evaluated. As the lower transparent electrode plate (1), the transparent electrode plates for a touch panel of Example 1, Example 2 and Comparative Example 1 are 250 mm in width × 1 in length.
It was cut to 80 mm and used. As the upper transparent electrode plate (7), a film was formed on a polyethylene terephthalate film (manufactured by Teijin Ltd., product name: Tetron film) having a thickness of 188 μm by the same method as the method described in the section of the production of the transparent conductive film. An ITO film having a thickness of about 25 nm was used. For the spacer (6), a double-sided tape having a thickness of 100 μm was used. Further, a dot spacer (11) having a height of 10 μm and a diameter of 50 μm was coated on the lower transparent conductive film (3) with a 3 mm pitch in a staggered pattern with a photo-curable acrylic resin, and cured by irradiation with ultraviolet rays. Then, an insulating film was formed on the electrode (4) and the electrode (10) to produce a touch panel having a size corresponding to a 12-inch type, that is, 250 mm wide × 180 mm long. The touch panel using the transparent electrode plate for a touch panel of Examples 1 and 2 operated normally. The transparent electrode plate using the transparent electrode plate for a touch panel of Comparative Example 1 is
Deformation was observed at the time of curing under heating at 150 ° C,
It was unsuitable for a touch panel.

[0058]

INDUSTRIAL APPLICABILITY The transparent electrode plate for a touch panel and the touch panel of the present invention have heat resistance that can withstand the inorganic thin film forming step and the electrode thermosetting step while maintaining the excellent optical characteristics of the acrylic resin copolymer. Is to have. Further, the thin film adhesion is extremely excellent, and the surface treatment which has been necessary when the resin plate is used as a substrate can be eliminated. In addition, since a resin plate can be used for the substrate of the transparent electrode plate for a touch panel, it is possible to prevent damage to the touch panel, facilitate weight reduction, and reduce the wall thickness. Applications and shapes that could not be achieved using conventional glass plates Can be applied to.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a transparent electrode plate (lower part) for a touch panel of the present invention.

FIG. 2 is a plan view showing an example of a transparent electrode plate (lower part) for a touch panel of the present invention.

FIG. 3 is a cross-sectional view showing an example of the touch panel of the present invention.

[Explanation of symbols]

1 Transparent electrode plate (bottom) 2 Transparent substrate (bottom) 3 Transparent conductive film (bottom) 4 electrodes (bottom) 5 Lead electrode (bottom) 6 spacers 7 Transparent electrode plate (top) 8 Transparent substrate (top) 9 Transparent conductive film (upper part) 10 electrodes (top) 11 dot spacers

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5B087 AA04 CC14 CC17 CC36                 5G006 AA01 AZ01 FB17 FB30 FB39                       JA01 JB05 JD01 LG02                 5G023 AA12 CA08 CA41                 5G307 FA02 FC09 FC10

Claims (6)

[Claims] 1. A transparent electrode plate for a touch panel, comprising a transparent substrate and a transparent conductive film formed on at least one surface of the transparent substrate, wherein the transparent substrate has 1 to 1 carbon atoms.
Monoethylenically unsaturated monomer units containing methacrylic acid alkyl ester units having 4 alkyl groups 12.5 to
80 to 98 parts by mass of a copolymer (A) composed of 65% by mass and 35 to 87.5% by mass of a polyfunctional (meth) acrylate unit having two or more (meth) acryloyl groups, and a carbon number of 1 to 4 parts by mass of a resin composition consisting of 2 to 20 parts by mass of a (co) polymer (B) composed of a monoethylenically unsaturated monomer unit containing a methacrylic acid alkyl ester unit having 4 alkyl groups. A transparent electrode plate for a touch panel that is a transparent substrate. 2. The transparent electrode plate for a touch panel according to claim 1, wherein the deflection temperature under load is 150 ° C. or higher. 3. The transparent electrode plate for a touch panel according to claim 1, wherein the polyfunctional (meth) acrylate unit is a compound represented by the following general formula (1). [Chemical 1] (In the formula, R ¹ and R ² are H or CH ₃ , R ³ and R ⁴ are H or a hydrocarbon group having 3 or less carbon atoms, and n is an integer of 0 to ^4. ) 4. The transparent electrode plate for a touch panel according to claim 1, wherein the alkyl methacrylate unit having an alkyl group having 1 to 4 carbon atoms is a methyl methacrylate unit. 5. The transparent electrode plate for a touch panel according to claim 1, wherein the transparent conductive film is an ITO film. 6. An upper transparent electrode plate and a lower transparent electrode plate, wherein the upper transparent electrode plate and the lower transparent electrode plate are a transparent substrate and a transparent conductive material formed on at least one surface of the transparent substrate. A transparent electrode plate having a film, wherein the upper transparent electrode plate and the lower transparent electrode plate are a touch panel in which the transparent conductive films face each other with a space therebetween, and the upper transparent electrode plate. At least one of the lower transparent electrode plate and the lower transparent electrode plate is the transparent electrode plate for a touch panel according to any one of claims 1 to 5.