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Liquid crystal alignment agents and liquid crystal display elements

A technology of liquid crystal display element and liquid crystal alignment agent, which can be used in liquid crystal materials, chemical instruments and methods, optics, etc., and can solve problems such as poor liquid crystal alignment

Active Publication Date: 2008-08-27
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But, when using the liquid crystal aligning film obtained by coating the liquid crystal aligning agent containing polyamic acid or its imidized polymer formed by dehydration ring closure to prepare the liquid crystal display element, there are problems due to environmental temperature etc. during printing. Depression (Hajiki) occurs due to the change, and the problem of poor alignment of some liquid crystals occurs

Method used

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  • Liquid crystal alignment agents and liquid crystal display elements
  • Liquid crystal alignment agents and liquid crystal display elements
  • Liquid crystal alignment agents and liquid crystal display elements

Examples

Experimental program
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Effect test

Embodiment

[0089] The present invention will be further specifically described below through examples, but the present invention is not limited by these examples. In the following examples and comparative examples, the evaluation items and evaluation methods for the prepared liquid crystal aligning agent are as follows.

[0090] [Orientation of liquid crystal]

[0091] A liquid crystal display element using the obtained coating film as a liquid crystal aligning film was subjected to ON / OFF (applied / released) voltage, and observed with a polarizing microscope to see if there were any abnormal areas at this time. If there were no abnormal areas, it was judged as "good".

[0092] [Surface condition of coating film printed using liquid crystal aligning agent]

[0093] Prepare a 127 mm (D) × 127 mm (W) × 1.1 mm (H) glass substrate with an ITO film formed on the entire surface of one side, and use the liquid crystal aligning agent obtained in the above experiment in an environment of 25 ° C o...

Synthetic example 1

[0095] 112 g (0.50 mol) of 2,3,5-tricarboxycyclopentylacetic dianhydride as tetracarboxylic dianhydride, 1,3,3a, 4,5,9b-hexahydro-8-methyl-5- (Tetrahydro-2,5-dioxo-3-furyl)-naphtho[1,2-c]-furan-1,3-dione 157g (0.50mol), terephthalamide as a diamine compound Amine 95g (0.88mol), diaminopropyltetramethyldisiloxane 25g (0.10mol), 3,6-bis(4-aminobenzoyloxy)cholestane 6.4g (0.010mol), 4 - 4.0 g (0.030 mol) of aminophenyl octadecyl ether was dissolved in 4,500 g of N-methyl-2-pyrrolidone, and reacted at 60° C. for 6 hours. Then, 30 g of the obtained polyamic acid was dissolved in 570 g of N-methyl-2-pyrrolidone, 23 g of pyridine and 18 g of acetic anhydride were added, and dehydration ring closure was performed at 110° C. for 4 hours. After the imidization reaction, replace the solvent in the system with new γ-butyrolactone (this operation removes the pyridine and acetic anhydride used in the imidation reaction from the system) to obtain the solid content concentration 15% by weig...

Synthetic example 2

[0097] 112g (0.50mol) 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)naphtho[1,2-c]-furan-1,3-dione 157 g (0.50 mol), p-phenylenediamine as a diamine compound 90g (0.83mol), 25g (0.10mol) of diaminopropyl tetramethyldisiloxane and 4-(4'-trifluoromethoxybenzoyloxy)cyclohexyl-3,5-diaminobenzene 26 g (0.060 mol) of formate and 1.4 g (0.015 mol) of aniline as a monoamine were dissolved in 4,500 g of N-methyl-2-pyrrolidone, and reacted at 60° C. for 6 hours. Then, 30 g of the obtained polyamic acid was dissolved in 570 g of N-methyl-2-pyrrolidone, 23 g of pyridine and 18 g of acetic anhydride were added, and dehydration ring closure was performed at 110° C. for 4 hours. After the imidization reaction, replace the solvent in the system with new γ-butyrolactone (this operation removes the pyridine and acetic anhydride used in the imidation reaction from the system) to obtain the so...

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Abstract

The invention relates to a liquid crystal aligning agent containing polyamic acid obtained by reacting tetracarboxylic dianhydride and diamine compound, aminimide polymer of structure obtained by dehydrating and closing loop and mixture of polyamic acid and aminimide polymer of structure obtained by dehydrating, and solution selected from at least one solvent in isoamyl propionate and isoamylisobutyrate. The invention provides the liquid crystal aligning agent reducing recess in print with favorable coating performance even when environmental temperature varies in print.

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent and a liquid crystal display element. More specifically, this invention relates to the liquid crystal aligning agent which can form the liquid crystal aligning film favorable in liquid crystal orientation, and the liquid crystal display element provided with the said liquid crystal aligning film. Background technique [0002] A TN (twisted nematic) type liquid crystal display element is known in the past. The TN type liquid crystal display element has a TN type liquid crystal cell. A nematic liquid crystal layer with positive dielectric anisotropy is formed between them to make a sandwich-structured cell, and the long axis of the above-mentioned liquid crystal molecules is continuously twisted by 90 degrees from one substrate to the other substrate. In liquid crystal display elements such as the TN type liquid crystal display element, the alignment of liquid crystals is generally realize...

Claims

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Application Information

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IPC IPC(8): G02F1/1337
CPCC09K19/56G02F1/1337
Inventor 吉尾浩平林英治
Owner JSR CORPORATIOON
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