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Multilayer film and use of same

A film and polyester film technology, applied in the direction of film/flaky adhesives, layered products, synthetic resin layered products, etc., can solve the problems of lack of mass production, reduction of pencil hardness, and change of film thickness. Achieve the effect of excellent convenience, rich functionality, and maintain mass production

Active 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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  • Multilayer film and use of same
  • Multilayer film and use of same
  • Multilayer film and use of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0199] 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

[0201] A laminated film was obtained in the same manner as in Example 1 except that the stretch ratio in the longitudinal direction described in Table 1 was changed.

Embodiment 4

[0203] A laminated 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 multilayer film for foldable displays, which is free from the occurrence of creases or cracks in a folding part, for the purpose of providing a foldable display or the like that has excellent mass productivity and no possibility of distortion of an image displayed in a folding part after repeated folding. A multilayer film for foldable displays, which has an adhesive layer on at least one surface of a polyester film having a thickness of 10 to 100 mu m, 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 laminated film for a foldable display, a hard-coated film for a foldable display, a foldable display, and a mobile terminal device. Films, laminated films with adhesive layers for foldable displays, hard coat films for foldable displays, foldable displays, and mobile terminal devices. 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 required. [0003] On the other hand, a tablet terminal with a screen size of 7 inches to 10 inches is expected to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36B32B7/023B32B27/00G02B1/14B32B7/02
CPCC09J7/255C09J2203/318C09J2301/312C08J7/046C08J2367/02C08J2333/08G06F2203/04102C08J5/18G06F3/041G09F9/301C08J2367/00G02B1/14G06F1/1652
Inventor 西尾正太郎河合究清水亮
Owner TOYOBO CO LTD