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Composition for forming polyimide film, method for preparing the composition, and use of the composition

A technology of polyimide film and composition, applied in the direction of chemical instruments and methods, applications, household appliances, etc., can solve the problems of increased yellowness index, decreased adhesion of substrates such as glass, etc., to achieve improved reliability, excellent optical Excellent physical properties and bending properties

Pending Publication Date: 2022-08-05
SK INNOVATION CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, an increase in yellowness index or a decrease in adhesion to substrates such as glass occurs

Method used

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  • Composition for forming polyimide film, method for preparing the composition, and use of the composition
  • Composition for forming polyimide film, method for preparing the composition, and use of the composition
  • Composition for forming polyimide film, method for preparing the composition, and use of the composition

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Experimental program
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preparation example Construction

[0108] In the method for producing a polyimide film according to an embodiment, after the composition for forming a polyimide film is coated on the substrate, a placing step of placing at normal temperature may be further included. Through the placing step, the optical physical properties of the film surface can be more stably maintained. While not being bound by a particular theory, when the existing composition for forming a polyimide film is subjected to the above-mentioned placing step before curing, the solvent absorbs moisture in the air, and the moisture diffuses into the interior and interacts with the Polyamic acid and / or polyimide collide, resulting in cloudiness on the film surface and caking, which may cause uneven coating (refer to Figure 7 and Figure 8 ). On the other hand, the composition for forming a polyimide film according to one embodiment of the present invention is free from cloudiness and agglomeration even if it is left in the air for a long time, a...

Embodiment 1

[0124] Preparation of compositions for forming polyimide films

[0125] 133.5 g of dimethylpropionamide (N,N-dimethylpropionamide, DMPA) was filled in a stirrer flowing with nitrogen gas flow, and then 39 g of 2,2'-bismuth was dissolved while maintaining the temperature of the reactor at 25°C. (Trifluoromethyl)benzidine (TFMB). At a temperature of 50°C, 50 g of ethylene glycol bis(trimellitate) (TMEG100) was added thereto, and the mixture was dissolved and stirred. After stirring for 6 hours, 133.5 g of toluene (Toluene) was added at 25°C, followed by stirring for 18 hours. After that, DMPA and / or toluene were added so that the solids content was 20% by weight and the content of toluene in the composition was 50% by weight relative to the total weight of DMPA and toluene (ie, DMPA:toluene=50% by weight : 50% by weight). The viscosities of the prepared polyimide film-forming compositions are shown in Table 2 below.

Embodiment 2 to Embodiment 7

[0127] Preparation of compositions for forming polyimide films

[0128] A polyimide film for forming a polyimide film was prepared by the same method as in Example 1, except that DMPA and / or toluene were added so that the content of toluene satisfies the T content in Table 1 below with respect to the total weight of DMPA and toluene. combination. The viscosities of the prepared polyimide film-forming compositions are shown in Table 2 below.

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Abstract

The present invention relates to a composition for forming a polyimide film, a method for preparing the same, and a use of the same, according to the present invention, by providing a polyimide film which is colorless and transparent and which has excellent isotropy and anti-scattering properties while having excellent flexibility and bending properties, without deteriorating optical physical properties. The flexible display panel can be applied to various flexible display devices.

Description

technical field [0001] The present invention relates to a composition for forming a polyimide film, a method for preparing the composition and the use of the composition. Background technique [0002] Display devices represented by thin display devices such as liquid crystal displays or organic light emitting diode displays include not only smartphones and tablet computers, but also various wearable devices in recent years. Various smart devices characterized by portability. In such a smart device, in order to protect the display panel from scratches or external impact, a cover window for a display device is provided on the display panel. As such a cover window for a display device, tempered glass has been conventionally used, but in recent years, it has been replaced by a plastic film typified by a polyimide film in order to impart flexibility. [0003] In recent years, various smart devices require flexibility and flexibility, and even the foldable characteristics of fol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08J5/18C08L79/08G09F9/30
CPCC08G73/1067C08G73/1039C08G73/1007C08G73/1071C08J5/18G09F9/301C08J2379/08C08G73/16C08G73/1053C08L79/08C08G73/1078C08J3/091B32B27/281B32B2457/20C09D179/08C09D7/20
Inventor 尹哲民朴惠珍宋炫周
Owner SK INNOVATION CO LTD
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