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Prepolymer, oriented film, preparation method for oriented film, and liquid crystal display device

A technology of liquid crystal display devices and prepolymers, which is applied in the directions of instruments, optics, nonlinear optics, etc., can solve the problems of loss of orientation performance, intolerance to solvents, large pretilt angle, etc., to improve alignment performance and enhance chemical stability , Reduce the effect of repulsive force

Inactive Publication Date: 2012-08-15
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing polyimide materials suitable for the STN display mode often require a large pretilt angle, which makes them unsuitable for the ADS display mode
[0005] In addition, the existing polyimide alignment film also has the disadvantage of being intolerant to solvents. During the process of preparing liquid crystal display devices and the subsequent use of liquid crystal display devices, it is easy to slowly lose its alignment properties when it is attacked by solvents. , resulting in failure of the liquid crystal display device

Method used

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  • Prepolymer, oriented film, preparation method for oriented film, and liquid crystal display device
  • Prepolymer, oriented film, preparation method for oriented film, and liquid crystal display device
  • Prepolymer, oriented film, preparation method for oriented film, and liquid crystal display device

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preparation example Construction

[0051] In addition, the present invention also provides the preparation method of above-mentioned alignment film, and this method comprises the following steps:

[0052] 1) dissolving the above-mentioned polyimide prepolymer in an organic solvent, stirring evenly, coating it on a glass substrate, drying to remove the solvent and forming a film;

[0053] 2) Raise the temperature to 350-400°C to cross-link the phenylacetylene groups.

[0054] The above-mentioned organic solvent is not particularly limited as long as it is a high-boiling-point aprotic solvent, for example, N-methylpyrrolidone, DMAc (N, N-dimethylacetamide), DMF (N, N-dimethylformamide) can be used. )Wait. The above-mentioned coating method is not particularly limited, for example, spin coating, roll coating, brush coating, knife coating, dip coating, curtain coating, spray coating, gravure coating, etc. can be used, and spin coating is preferred. The drying can be carried out in a vacuum oven by increasing the ...

preparation example 1

[0058] Preparation Example 1: Preparation of PENA

[0059] Add 4-bromo-1,8-naphthalene anhydride ( AR, Anshan Huifeng Chemical Co., Ltd.) 10g, phenylacetylene 5.5g (6ml) (AR, Sigma-Aldrich Company), triphenylphosphine 0.1956g (CP, Shanghai Reagent No. 1 Factory), cuprous iodide 0.0657 g (AR, Sigma-Aldrich Company), triphenylphosphine palladium dichloride 0.0322g (AR, Sigma-Aldrich Company), 50ml distilled triethylamine (AR, Tianjin Chemical Reagent No. 2 Factory), 100ml toluene (AR, Beijing Chemical Reagent No. 1 Factory), the reaction mixture was slowly heated to reflux with an oil bath for 6.5 hours under the condition of feeding nitrogen, while keeping the nitrogen unobstructed. It can be observed that a yellow-white solid precipitates on the wall of the reaction bottle, and it is cooled and filtered to obtain a yellow solid. Afterwards, the catalyst and the inorganic salt produced by the reaction were washed away with distilled water, dried at 120°C for 2 hours, and recr...

preparation example 2

[0060] Preparation Example 2: Preparation of diamine monomer 1,4-bis(4-amino-2-trifluoromethylphenoxy)-2-(3'-trifluoromethylphenyl)benzene

[0061] The 1,4-bis(4-amino-2-trifluoromethylphenoxy)-2-(3'-trifluoromethylphenyl)benzene used in the examples is prepared according to the following chemical formula, and the specific steps are as follows stated.

[0062] Preparation of dinitromonomer: Add 0.2mol (50.84g) of trifluoromethylbisphenol to a 1000ml three-necked flask equipped with mechanical stirring, nitrogen vent, water device (Dean-Stark trap), and reflux condenser (According to the literature: Liu BJ, Wang GB, Hu W, Jin YH, Chen CH, Jiang ZH, et al.J Polym Sci Part A Polym Chem 2002; 40:3392 The method described in preparation), 2-chloro-5- Nitro-3-trifluorotoluene 0.4mol (90.22g) (AR, Shanghai Shandao Chemical Co., Ltd.), anhydrous potassium carbonate 0.24mol (33.12g) (AR, Tianjin Chemical Reagent Factory), DMF 500ml (AR, Tianjin Tiantai Fine Chemicals Co., Ltd.) and t...

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Abstract

The invention provides a polyimide prepolymer, an oriented film, a preparation method for the oriented film and a liquid crystal display device. The polyimide prepolymer has repetitive units shown in a formula (1) and is blocked by blocking agent with a phenylacetylene group, wherein Ar is selected from one structure shown in a formula (2) or (3), and n is an integer from 3 to 8.

Description

technical field [0001] The invention relates to a fluorine-containing polyimide prepolymer, an alignment film and a preparation method thereof, and a liquid crystal display device. The alignment film is especially suitable for a liquid crystal display device adopting an ADS (ADvanced Super Dimension Switch) display mode. Background technique [0002] In the past, liquid crystal displays using the STN (Super Twisted Nematic) display mode had the problems of small viewing angle, color fading when viewed from a larger side angle, and poor contrast and color performance. In order to solve this problem, people have developed a wide viewing angle technology. ADS (ADvanced Super Dimension Switch), that is, advanced ultra-dimensional field switching technology, forms a multi-dimensional electric field through the electric field generated by the edge of the slit electrode in the same plane and the electric field generated between the slit electrode layer and the plate electrode layer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08G73/12C08L79/08C08J3/24C08J5/18G02F1/1335G02F1/1337
CPCC08J5/18G02F1/1337C08J2379/08G02F1/133723G02F1/1335C08J3/24C08L79/08G02F1/134309C08G73/1039C08G73/12C08G73/10C09K2323/0271
Inventor 严巍王丹
Owner BOE TECH GRP CO LTD
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