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Polyimide film and flexible display panel including the same

A technology of polyimide base film and covering film, which is applied in the direction of identification devices, instruments, coatings, etc., and can solve problems such as eye fatigue and visibility degradation

Pending Publication Date: 2021-03-30
SK INNOVATION CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In particular, since the coating layer is laminated on the base layer to impart various physical properties to the window covering, diffuse reflection of light is caused, optical moiré occurs, and when applied to a display, it deteriorates visibility and causes eye fatigue

Method used

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  • Polyimide film and flexible display panel including the same
  • Polyimide film and flexible display panel including the same
  • Polyimide film and flexible display panel including the same

Examples

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preparation example Construction

[0069] The preparation of the oligomer may include reacting a fluoro-based aromatic diamine with an aromatic diacid chloride in a reactor, and purifying and drying the obtained oligomer. In this case, the fluorine-based aromatic diamine may be added at a molar ratio of 1.01 to 2 relative to the aromatic diacid chloride, and an amine-terminated polyamide oligomer monomer may be prepared. The molecular weight of the oligomer monomer is not particularly limited, but, for example, when the weight average molecular weight is in the range of 1000 g / mol to 3000 g / mol, more excellent physical properties can be obtained.

[0070] In addition, in order to introduce an amide structure, it is preferable to use an aromatic carbonyl halide monomer such as terephthaloyl chloride or isophthaloyl chloride instead of terephthalate (or phthalate) or terephthalate Dicarboxylic acid (or phthalic acid) itself. Chlorine appears to affect the physical properties of the membrane, but this is unclear....

preparation example 1

[0154] [Preparation Example 1] Preparation of a composition for forming a hard coat layer

[0155]2-(3,4-Epoxycyclohexyl)ethyltrimethoxysilane (ECTMS, TCI Co., Ltd.) and water were mixed in a ratio of 24.64g:2.70g (0.1mol:0.15mol) to prepare a reaction solution, and The reaction solution was placed in a 250 mL two-necked flask. 0.1 mL of tetramethylammonium hydroxide catalyst (Sigma-Aldrich) and 100 mL of tetrahydrofuran (Sigma-Aldrich) were added to the above mixture, and stirred at 25° C. for 36 hours. Afterwards, layer separation was performed, the product layer was extracted with dichloromethane (Sigma-Aldrich), water was removed from the extract using magnesium sulfate (Sigma-Aldrich), and the solvent was removed by drying under vacuum to obtain epoxy silicon Oxygenated resins. As a result of measurement using gel permeation chromatography (GPC), the epoxysiloxane-based resin had a weight average molecular weight of 2500 g / mol.

[0156] The 30g epoxysiloxane-based resi...

Embodiment 1

[0158]

[0159] Add terephthaloyl chloride (TPC) and 2,2'-bis(trifluoromethyl)-benzidine (TFMB) in the state of a mixed solution of dichloromethane and pyridine into the reactor, and Stir at 25°C for 2 hours. At this time, the molar ratio of TPC:TFMB was set to 300:400, and the solid content was adjusted to 10% by weight. Thereafter, the reactant was precipitated in an excess amount of methanol, and the solid content obtained by filtration was vacuum-dried at 50° C. for 6 hours or more to obtain an oligomer. The molecular weight (FW) of the prepared oligomer was 1670 g / mol.

[0160] N,N-dimethylacetamide (DMAc), 100 mol of oligomer and 28.6 mol of 2,2'-bis(trifluoromethyl)benzidine (TFMB) as solvent were added to the reactor and fully Stir. After confirming that solid raw material dissolves completely, fumed silica (surface area 95m 2 / g, <1 μm) was added to DMAc in an amount of 1000 ppm relative to solids and dispersed using ultrasonic waves. Add 64.3 mol of cyclobutan...

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Abstract

The present invention relates to a polyimide-based film, a window cover film, and a display device including the same. Particularly, the present invention relates to a polyimide-based film whose solubility to ethyl celosolve solvent satisfies formula 1 of [(FW1 - FW2) / FW1] x 100 <= 50 % (wherein FW1 represents the weight of the initial film, before the film is dipped in the solvent, and FW2 represents the weight of the film, after the film is dipped in ethyl celosolve solvent, allowed to stand at 60 DEG C for 2 hours and cooled to room temperature, and the solvent is removed, and then the film is dried at 80 DEG C for 4 hours).

Description

[0001] Cross References to Related Applications [0002] This application claims priority from Korean Patent Application No. 10-2019-0120536 filed with the Korean Intellectual Property Office on September 30, 2019, the entire contents of which are hereby incorporated by reference in their entirety. technical field [0003] The invention relates to a polyimide base film, a window covering film comprising the polyimide base film and a display panel. Background technique [0004] The display device includes a window cover provided on the display panel to protect the display panel from scratches or external impacts, and configured to be transparent so that a user can view a display unit in front of the display panel. [0005] Display devices are gradually becoming lighter, thinner and more flexible. Therefore, window coverings made of polymer films having high hardness, high rigidity, and flexibility have been actively researched instead of tempered glass. [0006] Since such ...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08J5/18G09F9/33G09F9/30
CPCC08J5/18G09F9/33G09F9/30C08J2379/08C08G73/14C08G69/42C08G73/1039C08G73/1042C08L79/08C08J7/04C08J7/046C08G73/1067C08L2203/16
Inventor 安钟南
Owner SK INNOVATION CO LTD
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