Polyimide film having excellent yield strain and flexural characteristics

A polyimide film, yield strain technology, applied in nonlinear optics, instruments, optics, etc., can solve the problems of low chemical resistance and mechanical strength, difficult to apply flexible displays, and the overall thickness of the outer covering window changes, etc. Achieve low yellowness, improved handling and reliability, excellent modulus

Pending Publication Date: 2021-08-13
DOOSAN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a material has the advantage of excellent transparency, but its glass transition temperature (Tg) is 150°C or lower, which results in poor heat resistance, low chemical resistance and low mechanical strength, and its application is limited.
In order to compensate for such problems, attempts have been made to introduce a thick hard coat layer on the above-mentioned plastic material, but in this case, cracks occur in the hard coat layer during molding or the bendability is significantly reduced.
In addition, there is a problem that the overall thickness of the outer cladding window is reduced, making it difficult to apply to flexible displays

Method used

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  • Polyimide film having excellent yield strain and flexural characteristics
  • Polyimide film having excellent yield strain and flexural characteristics
  • Polyimide film having excellent yield strain and flexural characteristics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0077] [Examples 1 to 5. Production of polyimide film]

[0078] The polyamic acid composition was manufactured using the composition containing the diamine and acid dianhydride described in Table 1 below.

[0079] After coating the above polyamic acid composition on a glass plate for LCD with a bar coater (Bar Coater), it was carried out in a convection oven in a nitrogen atmosphere at 80°C for 30 minutes, at 150°C for 30 minutes, and at 200°C. Drying and imide ring closure reaction (Imidazation) were performed simultaneously by gradually raising the temperature step by step at 300° C. for 1 hour. Thus, a polyimide film having a film thickness of 80 μm with an imidization rate of 85% or more was produced. After that, the polyimide film was separated from the glass plate and obtained.

[0080] [Table 1]

[0081]

experiment example

[0084] [Experimental example. Evaluation of physical properties]

[0085] The physical properties of the polyimide resin films produced in Examples 1 to 5 and Comparative Examples 1 to 5 were evaluated by the following methods, and the results are shown in Table 2 below. At this time, the physical properties in Table 2 below were evaluated on the basis of a thickness of 80 μm.

[0086]

[0087] 1) Transmittance measurement

[0088] Measurement was performed at a wavelength of 550 nm using a UV-Vis NIR Spectrophotometer (UV-Vis NIR Spectrophotometer, Shimadzu, model name: UV-3150).

[0089] 2) Determination of yellowness

[0090] The yellowness at 550 nm was measured using a spectrophotometer (Konica Minolta, CM-3600A) according to ASTM E313-73 standard.

[0091] 3) Thickness measurement

[0092] The thickness of the film was measured with a thickness meter (Mitutoyo, model name: 547-401).

[0093] 4) Modulus measurement

[0094] UTM (Instron, model name: 5942) was used t...

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Abstract

The present invention relates to a polyimide film obtained by copolymerizing at least one type of diamine and at least one type of acid dianhydride, and, more specifically, to a polyimide film having excellent transparency, and ensuring both high yield strain (Y/S) and flexural characteristics so as to be usable as a cover window for a display.

Description

technical field [0001] The present invention relates to a polyimide film, and more specifically, to a polyimide film having excellent transparency, high yield strain (Y / S) and high bending characteristics, and capable of being used as a cover window of a display membrane. Background technique [0002] On the surface of a display device such as a liquid crystal display (Liquid Crystal Display: LCD) or an organic light emitting display (Organic Light Emitting Display: OLED), a cover window (cover window) is applied to protect the panel. As a material for conventional window coverings, tempered glass with excellent flatness, heat resistance, chemical resistance, moisture and gas barrier performance, small coefficient of linear expansion (CTE) and high light transmittance has been mainly used. [0003] On the other hand, in recent years, flexible displays such as curved displays or in-folding (in-folding) displays have been developed. In order to be applied to such a flexible ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08J5/18
CPCC08J5/18C08J2379/08G02F1/1333C08G73/10C08G73/1042C08G73/1039C08G73/1046C08G73/1064G02F1/133308G02F1/133331
Inventor 沈在铉李浩庸安炅日金源谦金东演
Owner DOOSAN CORP
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