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Transparent conductive polyester film and use of same

A technology of transparent conductivity and polyester film, which is applied in the fields of electrical digital data processing, identification devices, instruments, etc. It can solve the problems of inability to reduce weight, thicken the overall thickness, and cost, and achieve excellent convenience and maintain mass production , rich in functional effects

Pending Publication Date: 2021-12-31
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyimide film or aramid film is very expensive, which increases the price of the flexible terminal itself, so it is not preferred
[0011] In Patent Document 3, it is proposed to stack two substrate units sequentially provided with a substrate film layer, a hard coat layer, and a conductive layer so that the respective substrate film layers directly face each other, and to use a cycloolefin resin as the substrate. Film layer, but the overall thickness becomes too thick to reduce the weight, and the bending resistance of the cycloolefin resin substrate itself is not sufficient, so it cannot be applied to foldable displays

Method used

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  • Transparent conductive polyester film and use of same
  • Transparent conductive polyester film and use of same
  • Transparent conductive polyester film and use of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0220] The pellet (a) of polyethylene terephthalate was supplied to the extruder, and it melt|dissolved at 285 degreeC. The polymer is filtered with a filter material of stainless steel sintered body (nominal filtration precision 10 μm particle 95% cut-off), extruded into a sheet form from a nozzle, and then, statically applied casting method is used to contact with a casting drum with a surface temperature of 30°C To be cooled and solidified to make an unstretched film. This unstretched film was uniformly heated to 75° C. with a heating roll, heated to 85° C. with a non-contact heater, and stretched 1.4 times by a roll (longitudinal stretching). On the obtained uniaxially stretched film, the coating liquid for forming an easily bonding layer was applied to both surfaces by a roll coating method, and then dried at 80° C. for 20 seconds. It should be noted that the final (after biaxial stretching) coating weight after drying was 0.06 g / m 2 way to adjust. Then, it was introdu...

Embodiment 2～3

[0222] Except having changed into the draw ratio of the longitudinal direction described in Table 1, it carried out similarly to Example 1, and obtained the polyester film.

Embodiment 4

[0224] A polyester film was obtained in the same manner as in Example 1, except that the draw ratio in the width direction was changed to 4.4 times and the heat setting temperature was changed to 220°C.

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Abstract

To provide: a foldable display which has excellent mass productivity, while having no possibility of distortion of an image displayed in a folding part; and a transparent conductive polyester film for foldable displays, which is used in a portable terminal and is free from the occurrence of creases or breakage in a folding part. A transparent conductive polyester film for foldable displays, which is obtained by superposing a transparent conductive layer on at least one surface of a polyester film, wherein the polyester film satisfies the conditions described below. (1) The refractive index in the flexing direction is 1.590 to 1.620. (2) The refractive index in the folding direction is 1.670 to 1.700. (3) The refractive index in the thickness direction is 1.520 or less. (4) The density is 1.380 g / cm3 or more. (The flexing direction is a direction that is perpendicular to the folding part when the polyester film is folded.

Description

technical field [0001] The present invention relates to a transparent conductive polyester film for a foldable display, a foldable display, and a mobile terminal device, and relates to a foldable display that does not easily cause deformation of the film or image distortion caused by discontinuity even if it is repeatedly bent, and Transparent conductive polyester film and touch panel for mobile terminal equipment and the above-mentioned foldable display. Background technique [0002] The thin film lightweight of mobile terminal equipment has been promoted, and mobile terminal equipment represented by smartphones has been widely popularized. Various functions are required for mobile terminal devices, and convenience is also required conversely. Therefore, popular mobile terminal devices are predicated on the premise that they can be easily operated with one hand and can be further stored in a pocket of clothing. Therefore, a small screen size of about 6 inches is sometimes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36B32B7/023B32B7/025C08J5/18G06F3/041G09F9/00G09F9/30
CPCC08J7/046C08J2367/02C08J2433/04G06F2203/04102C08J7/044C08J5/18G06F3/041G09F9/301C08J2367/00
Inventor 西尾正太郎河合究松村芽衣清水亮
Owner TOYOBO CO LTD