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Liquid crystal tropism agent and liquid crystal display element

A technology of liquid crystal display elements and liquid crystal alignment agents, which is applied in the direction of liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problems of easy repulsion, decline in electrical characteristics of liquid crystal display elements, easy generation of pores, etc., and achieve excellent voltage retention rate , excellent orientation and reliability, and good printability

Inactive Publication Date: 2007-01-17
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional liquid crystal alignment film made of polyimide lacks affinity with organic films such as protective films, and it is easy to repel when coating, and it is easy to generate pores, which will cause the alignment of liquid crystals and the obtained liquid crystals The problem that the electrical characteristics of the display element are degraded

Method used

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  • Liquid crystal tropism agent and liquid crystal display element
  • Liquid crystal tropism agent and liquid crystal display element
  • Liquid crystal tropism agent and liquid crystal display element

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0103] 224.17g (1.0 mole) of 2,3,5-tricarboxycyclopentyl acetic acid dianhydride as tetracarboxylic acid dianhydride and 108.14g (1.0 mole) of p-phenylenediamine as diamine compound are dissolved in 4500g N- Methyl-2-pyrrolidone was reacted at 60°C for 6 hours. Next, the reaction solution was poured into a large excess of methanol to precipitate the reaction product. Then, washing|cleaning with methanol and drying at 40 degreeC under reduced pressure for 15 hours obtained 380 g of polyamic acids whose logarithmic viscosity was 0.75 dl / g. 30 g of the obtained polyamic acid was dissolved in 570 g of N-methyl-2-pyrrolidone, 23.4 g of pyridine and 18.1 g of acetic anhydride were added, and dehydration and ring closure were carried out at 110° C. for 4 hours. Precipitation, washing, and reduction were performed in the same manner as above. was pressed to obtain 18.2 g of a polyimide having a logarithmic viscosity of 0.68 dl / g (this was referred to as "polyimide (A-1)").

Synthetic example 2

[0105] In Synthesis Example 1, except that 198.27 g (1.0 mol) of 4,4'-diaminodiphenylmethane was used as the diamine compound, 390 g of a compound having a logarithmic viscosity of 0.55 dl / g was obtained in the same manner as in Synthesis Example 1. polyamic acid. 30 g of the obtained polyamic acid was dissolved in 570 g of N-methyl-2-pyrrolidone, 5.7 g of pyridine and 7.4 g of acetic anhydride were added, and dehydration and ring closure were carried out at 110° C. for 4 hours. Precipitation, washing, and reduction were carried out in the same manner as above. was pressed to obtain 20.5 g of a polyimide having a logarithmic viscosity of 0.49 dl / g (this was referred to as "polyimide (A-2)").

Synthetic example 3

[0107]In Synthesis Example 1, except that 200.24 g (1.0 mol) of 4,4'-diaminodiphenyl ether was used as the diamine compound, 390 g of 4,4'-diaminodiphenyl ether with a logarithmic viscosity of 0.52 dl / g was obtained in the same manner as in Synthesis Example 1. polyamic acid. 30 g of the obtained polyamic acid was dissolved in 570 g of N-methyl-2-pyrrolidone, 5.7 g of pyridine and 7.4 g of acetic anhydride were added, and dehydration and ring closure were carried out at 110° C. for 4 hours. Precipitation, washing, and reduction were carried out in the same manner as above. was pressed to obtain 18.5 g of a polyimide having a logarithmic viscosity of 0.48 dl / g (this was referred to as "polyimide (A-3)").

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Abstract

Providing a liquid crystal aligning film having high voltage retention and good printability on an organic film, and a transverse electric field system liquid crystal display device having the liquid crystal aligning film. The liquid crystal aligning agent contains a polymer having a polyamic acid repeating unit and a repeating unit of imidated polyamic acid, a compound having four epoxy groups in a molecule and a silane coupling agent. The liquid crystal display device has the liquid crystal aligning film formed of the liquid crystal aligning agent.

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent and a liquid crystal display element. More specifically, it is excellent in electrical characteristics, and is related with the liquid crystal aligning agent for liquid crystal aligning agents which were excellent in printability, and the transverse electric field type liquid crystal display element obtained therefrom. Background technique [0002] Conventionally, a TN-type liquid crystal display element having a TN (twisted nematic) type liquid crystal cell is known, which has a positive dielectric anisotropy formed between two substrates on which a liquid crystal alignment film is formed on the surface through a transparent conductive film. The nematic liquid crystal layer constitutes a cell with a sandwich structure, and the long axis of the above-mentioned liquid crystal molecules is continuously twisted 90 degrees from one substrate to the other. [0003] In addition, there is also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337
CPCC08G73/10C08L79/08C09K19/56G02F1/133G02F1/133723
Inventor 川口贵之熊谷勉西川通则高桥敦也
Owner JSR CORPORATIOON
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