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Liquid crystal oriented agent and liquid crystal display element

A technology of liquid crystal alignment agent and substance, which is applied in liquid crystal materials, chemical instruments and methods, optics, etc., and can solve problems such as thermal deterioration of liquid crystal alignment film, unknown, and drop in liquid crystal voltage retention rate

Active Publication Date: 2009-06-10
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] If the conventionally known liquid crystal display element is continuously driven for a long time (for example, more than 1000 hours), there is a problem that the contrast between light and dark of the element decreases.
This defect is considered to be due to the thermal degradation of the liquid crystal alignment film due to the thermal stress generated by long-term driving, resulting in a decrease in the voltage retention of the liquid crystal.
Therefore, even when the liquid crystal display element is driven for a long time, a liquid crystal aligning film capable of exhibiting stable voltage retention and excellent heat resistance is required, but a liquid crystal aligning agent capable of forming such a liquid crystal aligning film is still unknown.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0127] Synthesis Example 1 (Synthesis Example 1 of Polyimide)

[0128] 112g (0.50 moles) of 2,3,5-tricarboxycyclopentylacetic dianhydride as tetracarboxylic dianhydride and 1,3,3a,4,5,9b-hexahydro-8-methyl-5- (Tetrahydro-2,5-dioxo-3-furyl)-naphthalene[1,2-c]-furan-1,3-dione 157g (0.50 moles), p-phenylenediamine as diamine 83g (0.78 mol), 3,5-diaminobenzoic acid 15.2g (0.10 mol), diaminopropyl tetramethyldisiloxane 25g (0.10 mol) and 3,6-bis(4-aminobenzoyloxy 13 g (0.020 moles) of cholestane, and 2.7 g (0.030 moles) of aniline as a monoamine were dissolved in 960 g of N-methyl-2-pyrrolidone, and reacted at 60 ° C for 6 hours to obtain polyamic acid solution. A small amount of the obtained polyamic acid solution was taken, and N-methyl-2-pyrrolidone was added to prepare a solution with a concentration of 10% by weight. The measured solution viscosity was 48 mPa·s.

[0129] Then, 2700 g of N-methyl-2-pyrrolidone was added to the obtained polyamic acid solution, and 396 g of py...

Synthetic example 2

[0131] Synthesis example 2 (synthesis example 2 of polyimide)

[0132] 224g (1.0 mol) of 2,3,5-tricarboxycyclopentyl acetic dianhydride as tetracarboxylic dianhydride, 76g (0.7 mol) of p-phenylenediamine as diamine, 3,5-diaminobenzoic acid 15g (0.10 mol) and 105g (0.20 mol) of the compound represented by the above-mentioned formula (D-10) were dissolved in 4500g of N-methyl-2-pyrrolidone and reacted at 60°C for 6 hours to obtain polyamic acid-containing solution. A small amount of the obtained polyamic acid solution was taken, concentrated under reduced pressure to prepare a solution with a concentration of 10% by weight, and the measured solution viscosity was 60 mPa·s.

[0133] Then, 2700 g of N-methyl-2-pyrrolidone was added to the obtained polyamic acid solution, and 396 g of pyridine and 409 g of acetic anhydride were added, and a dehydration ring-closing reaction was performed at 110° C. for 4 hours. After the dehydration ring-closing reaction, by the solvent in the sy...

Synthetic example 3

[0135] Synthesis example 3 (synthesis example 3 of polyimide)

[0136] 77g (0.34 mol) of 2,3,5-tricarboxycyclopentyl acetic dianhydride as tetracarboxylic dianhydride, 19g (0.18 mol) of p-phenylenediamine as diamine, 3,5-diaminobenzoic acid 27 g (0.18 mol) was dissolved in 1260 g of N-methyl-2-pyrrolidone and allowed to react at room temperature for 6 hours to obtain a solution containing polyamic acid. A small amount of the obtained polyamic acid solution was taken, concentrated under reduced pressure to prepare a solution with a concentration of 10% by weight, and the measured solution viscosity was 80 mPa·s.

[0137] Then, 600 g of N-methyl-2-pyrrolidone was added to the obtained polyamic acid solution, 136 g of pyridine and 105 g of acetic anhydride were added, and a dehydration ring-closure reaction was performed at 110° C. for 4 hours. After the dehydration ring-closing reaction, by the solvent in the system is carried out solvent replacement with new γ-butyrolactone, t...

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Abstract

The present invention provides a liquid crystal display element forming liquid crystal oriented agent of liquid crystal oriented film with excellent durability to long-time thermal stress, and avoiding deterioration of display capability even after long-time drive. The liquid crystal oriented agent includes a least a polymer selected from polyamic acid produced by reaction between tetracarboxylic dianhydride and diamine of a compound represented by the formula (A) and a matter group composed of polyimide produced by closing-ring dehydration of the polyamic acid, the liquid crystal display element includes a liquid crystal film formed with the liquid crystal oriented 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 related with the liquid crystal aligning agent which can form the liquid crystal aligning film excellent in heat resistance, and the liquid crystal display element which can suppress the display deterioration by thermal stress, and can drive for a long time. Background technique [0002] At present, as a liquid crystal display element, a TN type liquid crystal display element having a so-called TN type (twisted nematic) liquid crystal cell is widely known, and a liquid crystal alignment film is formed on the surface of a substrate on which a transparent conductive film is provided as a substrate for a liquid crystal display element. , the two substrates are placed opposite each other, and a nematic liquid crystal layer with positive dielectric anisotropy is formed in the gap to form a sandwich structure cell. The long axis of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337
CPCC09K19/56G02F1/1337
Inventor 泉谦一林英治
Owner JSR CORPORATIOON
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