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Liquid crystal aligning agent and liquid crystal display element

A technology of liquid crystal display element and liquid crystal alignment agent, which is applied in the directions of instruments, optics, nonlinear optics, etc., can solve the problems of insufficient storage stability and insufficient liquid crystal alignment.

Inactive Publication Date: 2012-09-26
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, conventionally known epoxy-based crosslinking agents have problems in that storage stability is not sufficient, and in particular, sufficient liquid crystal orientation cannot be obtained in an orientation mode adapted to rubbing treatment.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0089] Liquid crystal orientation

[0090] The liquid crystal display elements produced in Examples and Comparative Examples were observed with a polarizing microscope to see if abnormal regions appeared when the voltage was turned on / off (applied / released), and it was judged as "good" when no abnormal regions appeared. Table 1 put together the result of evaluating liquid-crystal orientation about each aligning agent.

[0091] voltage retention

[0092] A voltage of 5 V was applied to the liquid crystal display element for 60 microseconds in a span of 167 microseconds, and then the voltage retention rate after 167 microseconds from the release of the applied voltage was measured. As the measuring device, VHR-1 manufactured by Toyo Technica Co., Ltd. was used. A case where the voltage retention rate was 90% or more was judged to be good, and a case other than that was judged to be bad. Table 1 summarizes the results of evaluating the voltage retention ratio for each align...

Synthetic example 1

[0097] In a 200ml three-neck flask equipped with a Dimro reflux condenser, mix 12.52ml (0.16mol) of epichlorohydrin, 18ml of ethanol, and 1.8ml of pure water, and heat up to 50°C while stirring. 4.53 g (0.04 mol) of aminomethylcyclohexane was dropped into the solution, and the temperature of the reaction solution was raised during the drop, and the reaction temperature was controlled between 48°C and 53°C. Then, it was heated and stirred within the temperature range for 3 hours, then the reaction temperature was controlled at 30° C., 8 g of 50% NaOH aqueous solution was added dropwise over 45 minutes, and it was further heated and stirred at this temperature for 3 hours. The precipitated salt was removed by filtration, the filtrate was transferred to an eggplant-shaped beaker, and ethanol was removed by an evaporator. 30 ml of toluene was added to the residue, washed four times with 15 ml of pure aqueous solution, and once with 15 ml of saturated saline aqueous solution. Afte...

Synthetic example 2

[0100] In a 200ml three-neck flask equipped with a Dimro reflux condenser, mix 12.52ml (0.16mol) of epichlorohydrin, 18ml of ethanol, and 1.8ml of pure water, and heat up to 50°C while stirring. 4.29 g (0.04 mol) of benzylamine was dropped into the solution, and the temperature of the reaction solution was raised during the drop, and the reaction temperature was controlled between 48°C and 53°C. Then, it was heated and stirred within the temperature range for 3 hours, then the reaction temperature was controlled at 30° C., 8 g of 50% NaOH aqueous solution was added dropwise over 45 minutes, and it was further heated and stirred at this temperature for 3 hours. The precipitated salt was removed by filtration, the filtrate was transferred to an eggplant-shaped beaker, and ethanol was removed by an evaporator. 30 ml of toluene was added to the residue, washed four times with 15 ml of pure aqueous solution, and once with 15 ml of saturated saline aqueous solution. After drying th...

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Abstract

Disclosed is a liquid crystal aligning agent containing (a) at least one polymer selected from the group consisting of polyamic acids and imidized polymers thereof, and (b) a compound represented by the formula (A) below and having two epoxy groups in a molecule. (In the formula, R01 represents a hydrogen atom or a monovalent organic group having 6-30 carbon atoms and bonded to the N atom by an aliphatic carbon.) This liquid crystal aligning agent is excellent in storage stability and adhesion to a substrate, and enables to form a tough coating film which hardly suffers from scratches due to rubbing processes performed under various conditions. Consequently, this liquid crystal aligning agent enables to form a liquid crystal alignment film having excellent liquid crystal aligning ability by performing a rubbing process on the surface of the coating film.

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent used for a liquid crystal display element and the liquid crystal display element. Specifically, this invention relates to the liquid crystal aligning agent used for the liquid crystal display element excellent in both liquid crystal orientation and storage stability, and the said liquid crystal display element. Background technique [0002] In the past, the known TN-type liquid crystal display element has a TN (twisted nematic, Twisted Nematic) type liquid crystal unit, and the TN-type liquid crystal unit is prepared as follows: between two substrates on which a liquid crystal alignment film is formed on the surface via a transparent conductive film , form a layer of nematic liquid crystal with positive dielectric anisotropy, and make a sandwich structure unit, the long axis of the above-mentioned liquid crystal molecules is continuously twisted 90 degrees from one substrate to the other ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1337C08L63/00C08L79/08
CPCC08G59/30G02F1/133784C08L79/08C08L63/00G02F1/133711C08L2666/20C08L2666/22G02F1/1337
Inventor 阿部翼植阪裕介林英治西川通则
Owner JSR CORPORATIOON
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