Transparent conductive sheet for touch panel, method for manufacturing same and touch panel

A technology of transparent sheets and transparent conductive layers, which is applied in the direction of cable/conductor manufacturing, conductive layers on insulating carriers, circuits, etc., can solve the problem of reduced flexibility of ITO conductive layers, reduced light transmittance, and low image visual recognition and other problems, to achieve the effect of good surface resistance maintenance, good durability, and high operation reliability

Inactive Publication Date: 2008-09-24
SHIN-ETSU POLYMER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large refractive index of the ITO conductive layer and the strong surface reflection of light, the transmittance of light decreases, and it tends to turn yellow, and the color tone of the image changes.
Moreover, the ITO conductive layer may be deteriorated and blackened due to electrochemical reactions
For these reasons, not only the visibility of the image is reduced, but also the flexibility of the ITO conductive layer is reduced, cracks occur when bent, and the resistance value increases.
Moreover, it is not simple to form an ITO conductive layer on a PET film

Method used

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  • Transparent conductive sheet for touch panel, method for manufacturing same and touch panel
  • Transparent conductive sheet for touch panel, method for manufacturing same and touch panel
  • Transparent conductive sheet for touch panel, method for manufacturing same and touch panel

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0196] (Production Example 1) Synthesis of polystyrenesulfonic acid

[0197] Dissolve 206 g of sodium styrene sulfonate in 1000 ml of ion-exchanged water, drop 1.14 g of ammonium persulfate oxidant solution predissolved in 10 ml of water in 20 minutes while stirring at 80° C., and stir the solution for 2 hours.

[0198] Add 1,000 ml of sulfuric acid diluted to 10% by mass and 10,000 ml of ion-exchanged water to the obtained sodium polystyrene sulfonate solution, remove about 10,000 ml of the acid solution containing sodium polystyrene sulfonate by ultrafiltration, and add Add 10000ml of ion-exchanged water, and use ultrafiltration to remove about 10000ml of the solution. Repeat the above ultrafiltration operation three times.

[0199] Next, about 10,000 ml of ion-exchanged water was added to the obtained filtrate, and about 10,000 ml of the solution was removed by ultrafiltration. This ultrafiltration operation was repeated three times.

[0200] The ultrafiltration conditio...

manufacture example 2

[0206] (Production Example 2) Synthesis of Esters

[0207] 43.6 g of pyromellitic dianhydride and 73.6 g of glycerin were put into an eggplant-shaped flask, and mixed. The eggplant-shaped flask containing the mixture of pyromellitic dianhydride and glycerin was placed in an oil bath at 100° C., and after stirring for 10 minutes, 0.1 g of p-toluenesulfonic acid was added and stirred for 1 hour. In this way, pyromellitic dianhydride and glycerin undergo a dehydration reaction to obtain a reaction solution containing ester compounds. Therefore, 115 g of ion-exchanged water was added to the obtained reaction solution, stirred to dissolve, and the solution concentration was adjusted by adding ion-exchanged water so that the solid concentration of the solution was maintained at 50% by mass. The aqueous solution obtained by this method is used as an aqueous ester compound solution.

Embodiment 1

[0209] 14.2 g of 3,4-ethylenedioxythiophene was mixed with a solution of 36.7 g of polystyrenesulfonic acid dissolved in 2000 ml of ion-exchanged water at 20°C.

[0210]The thus obtained mixed solution was kept at 20°C, and while mixing and stirring, an oxidation catalyst solution of 29.64 g of ammonium persulfate and 8.0 g of iron sulfate dissolved in 200 ml of ion-exchanged water was slowly added, and stirred for 3 hours to allow reaction.

[0211] 2000 ml of ion-exchanged water was added to the obtained reaction solution, and about 2000 ml of the solution was removed by ultrafiltration. This operation was repeated three times.

[0212] Then, add 200ml of sulfuric acid diluted to 10% by mass and 2000ml of ion-exchanged water to the treatment solution that has undergone the above-mentioned treatment, remove about 2000ml of treatment solution by ultrafiltration, add 2000ml of ion-exchange water therein, and use ultrafiltration method to remove about 2000ml of solution. This ...

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Abstract

Disclosed is a transparent conductive sheet for touch panels which has a surface resistivity of not more than 1000omega, a total light transmittance of not less than 80% and a haze of not more than 5%, while being excellent in water resistance and adhesion between a transparent base and a transparent conductive layer. Specifically disclosed is transparent conductive sheet for touch panels which comprises a transparent base and a transparent conductive layer formed on the transparent base. The transparent conductive layer contains a pi-conjugated conductive polymer, a polyanion and an ester compound or a specific polymerizable compound. The transparent conductive layer may contain, if necessary, a conductivity improver, a dopant, another resin component and an additive. In particular, a conductivity improver may preferably be contained for increasing the conductivity.

Description

technical field [0001] The invention relates to a transparent conductive sheet for a touch panel and a manufacturing method thereof. It also relates to a touchpad as a data input device. [0002] This application claims the priority of Japanese Patent Application No. JP2005-283862 filed on September 29, 2005 and Japanese Patent Application No. JP2005-320540 filed on November 4, 2005, the contents of which are incorporated herein by reference. Background technique [0003] In recent years, in ATM machines (automated teller machines) of banks, monitors of OA equipment, terminals for various information retrieval, etc., touch panels that allow input by only touching a part of the screen are widely used. [0004] A touch panel is provided with a pair of transparent conductive sheets formed on a transparent base material and an insulating spacer provided in a part between the pair of transparent conductive sheets for the touch panel, the transparent conductive layers of the resp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B5/14G06F3/041G06F3/045H01B13/00
Inventor 吉田一义宁太陆阿部利香松林总
Owner SHIN-ETSU POLYMER CO LTD
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