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Polyamide-imide, polyamide-imide film and display device

A polyamide-imide and film technology, applied in the field of polyamide-imide film and polyamide-imide, can solve the problems of low linear thermal expansion coefficient, poor material solubility, and limited linear thermal expansion coefficient, etc. Good solubility and heat resistance, low coefficient of thermal expansion properties, effect of low coefficient of linear thermal expansion

Active Publication Date: 2020-08-14
武汉柔显科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult for general aromatic polyimides to meet this requirement due to their large conjugated structures and strong intramolecular and intermolecular interactions.
[0004] In order to solve the above limitations, those skilled in the art have tried to polymerize by changing the monomer structure and adding fillers. The mechanical properties, solvent resistance and flame retardancy have been improved to a certain extent, but there is still a limit to the final increase of the linear thermal expansion coefficient.
The document J.Jin, J.-H.Ko, S.Yang, B.-S.Bae, Rollable transparent glass-fabricreinforced composite substrate for flexible devices. Adv.Mater.22, 4510–4515 (2010) used the addition of The method of fillers has obtained a lower linear thermal expansion coefficient, but these filler composites have poor toughness and are difficult to process, and the optical haze is serious
Literature S.-H.Lin, F.Li, S.Z.D.Cheng, F.W.Harris, Organo-soluble polyimides: Synthesis and polymerization of 2,2′-bis(trifluoromethyl)-4,4′,5,5′-biphenyltetracarboxylicdianhydride.Macromolecules 31, 2080–2086 (1998) introduced a rigid framework structure into the polymer, which can significantly improve the linear thermal expansion coefficient, but the rigid framework structure will make the solubility of the material poor and difficult to process, and the rigid aromatic Polyimide is easy to produce yellow color and reduce light transmittance due to the rigid aromatic ring in the skeleton
These polyimides avoid the problems of poor mechanical properties and heat resistance, but on the one hand, the monomer structure is complex, and on the other hand, due to the introduction of a large proportion of rigid skeleton structure, the yellowing of the material and poor light transmission are produced. question

Method used

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  • Polyamide-imide, polyamide-imide film and display device
  • Polyamide-imide, polyamide-imide film and display device
  • Polyamide-imide, polyamide-imide film and display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0108] In a 1000mL reactor equipped with a stirrer, nitrogen injector, dropping funnel, temperature controller and condenser, add 500g of N-methylpyrrolidone (NMP) while blowing nitrogen, and dissolve 16.012g (0.05mol ) of TFMB. Subsequently, 32.9 g (0.06 mol) of DA-1 was added, 25.1 g of CaCl 2 , 83.4ml of triphenylphosphine, 83.4ml of pyridine, the reaction was heated to 100°C for 8h, and then 1.76g (0.01mol) of 35DBTF was added, and NMP solvent was added gradually, and the reaction was continued for 8h. After the reaction, the liquid was poured into 3000mL of rapidly stirring methanol, the product was filtered and washed, and dried overnight at 180°C under vacuum. The solid was re-dissolved with NMP to form a 10% polyamideimide solution.

[0109] After the reaction, the obtained solution was coated on a glass plate, cast to 100 μm to 300 μm, dried at 80°C for 20 minutes under vacuum, at 120°C for 20 minutes, and at 300°C for 10 minutes at a constant temperature, and slowl...

Embodiment 2～11

[0111] By adopting the same process as in Example 1 and selecting different monomers of the first block, the second block and the third block, polyamide-imide films with different effects can be obtained. The raw materials and usage amounts of each monomer are summarized in Table 2, wherein the amounts of all materials are molar amounts.

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Abstract

The invention discloses a polyamide-imide, a polyamide-imide film and a display device comprising the film. The polyamide-imide comprises at least two different block structures, wherein the first block has a repeating unit with a structure shown in the following formula I, and the second block has a repeating unit with a structure shown in the following formula II. The film prepared from the multi-block polyamide-imide has excellent solubility, heat resistance and mechanical properties, low thermal expansion coefficient performance, high light transmittance and relatively low cut-off wavelength, so that the film can be used as a display device material of a flexible display, and is particularly suitable for being used as a substrate material in the display.

Description

technical field [0001] The invention relates to polyamide-imide, polyamide-imide film, and a display device containing the film, in particular to a transparent polyamide-imide film for flexible displays. Background technique [0002] In recent years, with the advent of an advanced information society, optical materials such as optical fibers and optical waveguides in the field of optical communications, and optical materials such as liquid crystal alignment films and protective films for color filters in the field of display devices have been developed. In particular, in the field of display devices, as a substitute for glass substrates, research has been conducted on lightweight and highly flexible plastic substrates, and displays that can be bent or rolled up have been actively developed. Therefore, a higher-performance optical material that can be used for various purposes is being sought. [0003] Aromatic polyimides are widely used in the fields of microelectronics and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/14C08J5/18C08L79/08G09F9/30
CPCC08G73/14C08J5/18G09F9/301C08J2379/08Y02E10/549
Inventor 颜枫肖桂林鲁丽平朱双全
Owner 武汉柔显科技股份有限公司
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