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Low-birefringence polyimide film and preparation method thereof

A technology of polyimide film and low birefringence, which is applied in the field of optical materials, can solve the problems of light delay, increase the color shift of different viewing angles, reduce the black and white contrast of the display, and achieve the effect of low birefringence performance

Active Publication Date: 2021-09-24
浙江中科玖源新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing transparent polyimide generally has a large birefringence, and the large birefringence will delay the light, thereby reducing the black and white contrast of the display, increasing the color shift of different viewing angles, etc.

Method used

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  • Low-birefringence polyimide film and preparation method thereof
  • Low-birefringence polyimide film and preparation method thereof
  • Low-birefringence polyimide film and preparation method thereof

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preparation example Construction

[0036] The present invention also proposes a preparation method of a low-birefringence polyimide film, specifically comprising:

[0037] (1) first in an organic solvent, alicyclic dianhydride, terephthaloyl dichloride and isophthaloyl dichloride are mixed and polycondensed with aromatic diamine to obtain a polyamic acid solution;

[0038] The above-mentioned solvent can be selected from N-methylpyrrolidone, N, N-dimethylacetamide, N, N-dimethylformamide, dimethyl sulfoxide, m-cresol, chloroform, tetrahydrofuran, γ-butyrolactone or at least one of 3-methyl-N,N-dimethylpropanamide.

[0039] (2) adding a dehydrating agent and a catalyst to the obtained polyamic acid solution for imidization reaction, and then dropping into a poor solvent for precipitation to obtain a polyimide;

[0040] The above-mentioned dehydrating agent can be selected as at least one of acetic anhydride, propionic anhydride, butyric anhydride or benzoic anhydride; the catalyst can be selected as pyridine, p...

Embodiment 1

[0046] A kind of low birefringence polyimide film, its preparation method comprises:

[0047] Under nitrogen protection, 2.2416g (7mmol) 2,2'-bis(trifluoromethyl)diaminobiphenyl (TFDB) and 1.0453g (3mmol) 9,9'-bis(4-aminophenyl)fluorene ( FDA) was added into 60mLN, N-dimethylacetamide and stirred to dissolve completely, then added 0.8885g (2mmol) 4,4'-hexafluoroisopropylphthalic anhydride (6FDA), 1.1523g (3mmol) Bornane-2-spironolactone-α-cyclopentanone-α'-spironolactone-2"-norbornane-5,5",6,6"-tetracarboxylic dianhydride (CpODA) and 1.0152g (5mmol) of Phthaloyl chloride (TPC), stirred and reacted at 30°C for 10h, then added 2.25g of isoquinoline and 2.65g of acetic anhydride, stirred at room temperature for 1h, continued stirring at 80°C for 1h, and added the resulting reaction solution dropwise to excess methanol Precipitated in the solution, filtered and rinsed with a large amount of methanol, then crushed the obtained precipitate, and dried in vacuum at 80°C for 5 hours t...

Embodiment 2

[0051] A kind of low birefringence polyimide film, its preparation method comprises:

[0052] Under nitrogen protection, 2.2416g (7mmol) 2,2'-bis(trifluoromethyl)diaminobiphenyl (TFDB) and 0.4507g (3mmol) 2,4,6-trimethyl-1,3-benzene Add diamine (DAM) into 60mL N,N-dimethylacetamide and stir to dissolve completely, then add 0.8885g (2mmol) 4,4'-hexafluoroisopropylphthalic anhydride (6FDA), 1.1523g (3mmol) norbornane-2-spironolactone-α-cyclopentanone-α'-spirolactone-2"-norbornane-5,5",6,6"-tetracarboxylic dianhydride (CpODA) and 1.0152g (5mmol) terephthaloyl chloride (TPC), stirred and reacted at 30°C for 10h, then added 2.25g of isoquinoline and 2.65g of acetic anhydride, stirred at room temperature for 1h, continued to stir for 1h at 80°C, and the resulting reaction droplets Add to excess methanol to precipitate, filter and rinse with a large amount of methanol, then pulverize the obtained precipitate, and vacuum dry at 80°C for 5 hours to obtain polyimide powder;

[0053] A...

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Abstract

The invention provides a low-birefringence polyimide film and a preparation method thereof, and the polyimide film comprises alicyclic dianhydride, aromatic dianhydride and polyimide obtained by polycondensation of aromatic diacyl chloride and aromatic diamine, wherein the aromatic diamine at least comprises one kind of aromatic diamine containing rigid groups. The polyimide film can effectively reduce orientation anisotropy of transparent polyimide, so that birefringence of the polyimide film is remarkably reduced.

Description

technical field [0001] The invention relates to the technical field of optical materials, in particular to a low-birefringence polyimide film and a preparation method thereof. Background technique [0002] Flexible electronics and flexible display technologies have been the most active research directions in the field of electronic information in the past 10 years, and they are also important directions for the development of the electronic information industry. Flexible electronic products that are lightweight, bendable, foldable and even rollable, including flexible thin-film transistor liquid crystal displays and flexible organic light-emitting displays, have gradually developed into the most promising high-tech industries. [0003] In addition to being closely related to the development of design and manufacturing technology, the realization of flexible display technology also plays an important supporting role in the research and development and industrialization of var...

Claims

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Application Information

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IPC IPC(8): C08L79/08C08J5/18C08G73/10
CPCC08J5/18C08G73/1042C08G73/1075C08J2379/08Y02E10/549
Inventor 徐哲刘国隆解惠东邵成蒙
Owner 浙江中科玖源新材料有限公司
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