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Liquid crystal oriented agent and liquid crystal display element

A technology of liquid crystal display element and liquid crystal aligning agent, which is applied in the direction of liquid crystal materials, chemical instruments and methods, optics, etc., and can solve the problems of not very good performance, insufficient improvement of afterimage performance, and insufficient voltage retention rate, etc.

Inactive Publication Date: 2009-06-17
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the above-mentioned TN-type and STN-type liquid crystal display elements, the performance is not very good, and it is necessary to improve the performance of vertical alignment and afterimage performance of liquid crystal display elements.
[0004] In order to solve the above-mentioned problems, attempts have been made to focus on the relationship between voltage retention and afterimage performance, and to use polyimide or its imidized polymer synthesized by a diamine compound having an allyl group in a liquid crystal alignment film to improve voltage retention, and thereby improve the residual performance (see Patent Document 2), but even with this technology, the improvement of the residual image performance is still not good enough
[0005] In addition, it has also been attempted to use polyamic acid synthesized from tetracarboxylic dianhydride containing 1,2,3,4-cyclobutane tetracarboxylic dianhydride and pyromellitic dianhydride as a liquid crystal aligning agent to improve voltage retention. rate, residual charge, and afterimage performance (see Patent Documents 3 to 6), but there is a problem that sufficient voltage retention cannot be obtained when using these technologies

Method used

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

Examples

Experimental program
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Effect test

Synthetic example 1

[0125] 93 g (0.48 mol) of 1,2,3,4-cyclobutanetetracarboxylic dianhydride as tetracarboxylic dianhydride and 5 g (0.03 mol) of pyromellitic dianhydride, and 2 as diamine compound, 4-diamino-N, N-diallylaniline (the compound represented by the above-mentioned formula (1)) 81g (0.4 mol) and 52g (0.1 mol) of the compound represented by the above-mentioned formula (D-3) were dissolved in 928g N- Methyl-2-pyrrolidone was reacted at 60° C. for 6 hours to obtain a solution containing polyamic acid. A small amount of the obtained polyamic acid solution was taken, and N-methyl-2-pyrrolidone was added to prepare a solution with a polyamic acid concentration of 10% by weight. The viscosity of the solution was measured to be 53 mPa·s.

[0126] Then, 1160 g of N-methyl-2-pyrrolidone was added to the obtained polyamic acid solution, and 198 g of pyridine and 204 g of acetic anhydride were added, and a dehydration ring-closure reaction was performed at 110° C. for 4 hours. After the dehydrat...

Synthetic example 2

[0128] 93 g (0.48 mol) of 1,2,3,4-cyclobutanetetracarboxylic dianhydride as tetracarboxylic dianhydride and 5 g (0.03 mol) of pyromellitic dianhydride, and 2 as diamine compound, 4-diamino-N, N-diallylaniline 61g (0.3 moles) and 4-[4-(4-trans n-heptylcyclohexyl) phenoxy]-1,3-diaminobenzene 76g ( 0.2 mol) was dissolved in 944g of N-methyl-2-pyrrolidone and reacted at 60°C for 6 hours to obtain a solution containing polyamic acid. A small amount of the obtained polyamic acid solution was taken, and N-methyl-2-pyrrolidone was added to prepare a solution with a polyamic acid concentration of 10% by weight. The viscosity of the solution was measured to be 56 mPa·s.

[0129] Then, 1180 g of N-methyl-2-pyrrolidone was added to the obtained polyamic acid solution, and 198 g of pyridine and 204 g of acetic anhydride were added, and a dehydration ring-closure reaction was performed at 110° C. for 4 hours. After the dehydration ring-closure reaction, by replacing the solvent in the syst...

Synthetic example 3

[0131] 1,2,3,4-cyclobutanetetracarboxylic dianhydride 64g (0.33 mol), 2,3,5-tricarboxycyclopentyl acetic dianhydride 34g (0.15 mol) and 5 g (0.03 mol) of pyromellitic dianhydride, 81 g (0.4 mol) of 2,4-diamino-N,N-diallylaniline as a diamine compound, and the compound represented by the above formula (D-3) 52 g (0.1 mol) was dissolved in 956 g of N-methyl-2-pyrrolidone, and reacted at 60° C. for 6 hours to obtain a solution containing polyamic acid. A small amount of the obtained polyamic acid solution was taken, and N-methyl-2-pyrrolidone was added to form a solution with a polyamic acid concentration of 10% by weight. The viscosity of the solution was measured to be 52 mPa·s.

[0132] Then, 1195 g of N-methyl-2-pyrrolidone was added to the obtained polyamic acid solution, and 198 g of pyridine and 204 g of acetic anhydride were added, and a dehydration ring-closure reaction was performed at 110° C. for 4 hours. After the dehydration ring-closure reaction, by replacing the s...

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Abstract

The invention provides a liquid crystal orientation agent not only suitable for TN type and STN type, but also suitable for a vertical orientation type liquid crystal displaying element and capable of forming liquid crystal orientation membrane with good liquid crystal orientation, voltage retention rate and excellent image retention performance. The liquid crystal orientation agent comprises at least one polymer selected from the groups constituted by polyamic acid and imide polymer thereof, wherein the polyamic acid is formed by reacting tetraearboxylic dianhydride with diamine and the tetraearboxylic dianhydride comprises 1,2,3,4-butanetetracarboxylic dianhydride and 1-10mol% of pyromellitic dianhydride relative to the total tetraearboxylic dianhydride and the diamine comprises compound represented by the above formula (1).

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 voltage retention and excellent afterimage performance, and the liquid crystal display element excellent in afterimage performance. 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 it forms a liquid crystal on the surface of a substrate provided with a transparent conductive film such as an ITO (indium-tin oxide) film. Alignment film is used as a substrate for liquid crystal display elements. Two substrates are arranged opposite to each other, and a nematic liquid crystal layer with positive dielectric anisotropy is formed in the gap to form a box with a sandwich str...

Claims

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Application Information

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IPC IPC(8): G02F1/1337
CPCC09K19/56G02F1/1337
Inventor 泉谦一阿部翼林英治
Owner JSR CORPORATIOON
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