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Polyester film and application therefor

A polyester film and display technology, applied in film/sheet adhesives, lenses, synthetic resin layered products, etc., can solve problems such as increased uniaxial orientation, lack of mass production, and reduced pencil hardness , to achieve the effect of beautiful images and excellent convenience

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

[0007] Therefore, a method of partially changing the film thickness has also been proposed (see Patent Document 2), but there is a problem of lack of mass productivity.
[0008] In addition, a method of adjusting the refractive index of the polyester film in the bending direction has also been proposed (refer to Patent Document 3). However, as the refractive index in the bending direction is lowered, the pencil hardness at the time of hard coat coating is reduced, and the surface protection of the display is reduced. Problems with reduced functionality
In addition, if the refractive index in one direction is gradually lowered, the deformation during folding is improved, but there is a problem that the uniaxial orientation in the folding direction increases, and cracks or breakage occur in the folded portion.

Method used

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  • Polyester film and application therefor
  • Polyester film and application therefor
  • Polyester film and application therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0192] 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

[0194] 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

[0196] 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

In order to provide a folding-type display having excellent mass producibility and having no risk of distortions arising in an image displayed in a folding section after having been bent repeatedly, the invention provides a polyester film for use in a folding-type display touch panel module base material, wherein no cracks occur in the folding section. The polyester film for use in the folding-type display touch panel module base material satisfies the following conditions: (1) the refractive index in the bending direction is 1.590 to 1.620, (2) the refractive index in the direction of the folding section is 1.670 to 1.700, (3) the refractive index in the thickness direction is 1.520 or lower, and (4) the density is 1.380 g / cm3 or greater. (Herein, the bending direction is a direction that is orthogonal to the folding section when folding the polyester film.).

Description

technical field [0001] The present invention relates to: a polyester film for a touch panel assembly base material of a foldable display, a hard-coated film for a touch panel assembly base material of a foldable display, a foldable display, and a mobile terminal device. A polyester film and a hard-coated film for a foldable display and a mobile terminal device that cause image distortion due to deformation of the film, and a base material for a touch panel unit of the 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C55/12B32B27/36C08J5/18G09F9/30H01L27/32C08J7/043G06F3/041H05B33/02H01L51/50H05B33/14
CPCC08J5/18C08J7/043G06F3/041B29C55/143B29C55/08C08J7/042C08J7/046C08J2367/02C08J2433/08C08J2475/04C08J2439/06C09J7/255C09J2203/318C09J2467/006Y02E10/549G06F2203/04102H10K77/111H10K2102/311G09F9/301C08J2367/00G02B3/0087G06F1/1652G06F3/0412
Inventor 西尾正太郎河合究清水亮
Owner TOYOBO CO LTD