Polyimide-based film and window cover film including the same

A polyimide-based film and polyimide technology, applied in the input/output process of data processing, identification devices, instruments, etc., can solve problems such as poor visibility, light diffuse reflection, eye fatigue, etc.

Inactive Publication Date: 2021-10-22
SK INNOVATION CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, in order to impart various physical properties, a coating layer is laminated on the base layer of the window covering film, so that there is a problem of causing diffuse reflection of light, etc., and causing optical mottling, resulting in poor visibility, and it is applied to displays eye fatigue

Method used

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  • Polyimide-based film and window cover film including the same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0067] An exemplary preparation step of the film of the present invention is generally carried out by the following steps: the polyimide-based resin solution is discharged onto a support (substrate) such as a stainless steel belt, glass, film, etc. through a die (Die) Coating steps, drying steps and stretching steps, if necessary, can be prepared by further drying steps after stretching, and can be prepared by changing and adjusting the above-mentioned conditions so as to have the desired physical properties of the present invention , but the method is not particularly limited.

[0068] As an example, when describing the coating step of providing the film of the present invention, the coating step is a step of coating a resin solution on a substrate through a casting die, and adjusting the shear rate generated when the resin solution passes through the die. The shear rate and the air gap (air gap) which is the distance from the die lip portion to the surface of the support can...

Embodiment 1

[0162] In a mixed solution of dichloromethane and pyridine, mix isophthaloyl chloride (IPC), terephthaloyl chloride (TPC) and 2,2′-bis(trifluoromethyl )-benzidine (TFMB), stirred at 25° C. for 2 hours in a reactor under nitrogen atmosphere. The solids content was 10% by weight. After the above reaction, the reactant was precipitated in water, filtered, and the solid was vacuum-dried at 50° C. for 6 hours or more to obtain an oligomer. The molecular weight (FormulaWeight, FW) of the oligomer was 11580 g / mol.

[0163] In a reactor, using N,N-dimethylacetamide (DMAc) as a solvent, 100 moles of the oligomer and 20 moles of 2,2′-bis(trifluoromethyl)-benzidine ( TFMB) and stir well. After confirming that solid raw material dissolves completely, with respect to described solid, fumed silica (surface area is 95m 2 / g, <1μm) was added to DMAc at a content of 1000ppm, dispersed and added by ultrasonic waves. 120 mol of cyclobutanetetracarboxylic dianhydride (CBDA) was added and sti...

Embodiment 2

[0168] It was prepared by the same method as in Example 1 except that the wind speed in the drying section was 10 m / s.

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Abstract

The present invention relates to a polyimide-based film which does not substantially cause a mura or rainbow phenomenon and has excellent visibility, a window cover film including the same, and a display panel including the same.

Description

technical field [0001] The invention relates to a polyimide base film and a window covering film using the polyimide base film. Background technique [0002] In order to protect the display panel from scratches or external shocks, the display panel of the display device is provided with a transparent window cover film so that the user can see the display portion from the front of the display panel. [0003] Lightweight, thinner, and more flexible display devices are being gradually realized, so this film is made into a polymer film with high hardness, high rigidity, and flexibility and used instead of tempered glass. Although it is the case of the imide-based film, the polyimide-based film has a structure in which a severe phase lag occurs, so there are still problems to be solved. [0004] In addition, due to the phase retardation, when polarized light passes through the film, a rainbow mura phenomenon or the like occurs, which has a problem of poor visibility. [0005] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L79/08G09F9/30
CPCC08J5/18G09F9/301C08J2379/08C08G73/14G02B1/11G02B1/14C08L79/08C08J7/04G02B1/16C08G73/1007C08G73/1039C08G73/1078G02B1/04G06F3/041C08J7/046C08L2203/16
Inventor 金善国金惠璃朴尽秀宋炫周田承慜
Owner SK INNOVATION CO LTD
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