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Liquid crystal aligning agent, method for forming liquid crystal alignment film, and liquid crystal display device

A technology of liquid crystal alignment agent and repeating unit, which is applied in liquid crystal materials, chemical instruments and methods, instruments, etc., and can solve problems such as large radiation doses

Active Publication Date: 2012-12-05
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional photo-alignment films have the problem of requiring a large amount of radiation to achieve a large pretilt angle.

Method used

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  • Liquid crystal aligning agent, method for forming liquid crystal alignment film, and liquid crystal display device
  • Liquid crystal aligning agent, method for forming liquid crystal alignment film, and liquid crystal display device
  • Liquid crystal aligning agent, method for forming liquid crystal alignment film, and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0169] [Preparation of liquid crystal aligning agent]

[0170] The liquid crystal aligning agent of this invention contains radiation-sensitive polysiloxane as an essential component as mentioned above, and can contain other components as needed, It is preferable to prepare as the composition of the solution form which each component melt|dissolved in the organic solvent.

[0171] The organic solvent usable for the preparation of the liquid crystal aligning agent of the present invention is preferably a solvent that dissolves radiation-sensitive polysiloxane and other components optionally used but does not react with them.

[0172] The organic solvent which can be preferably used for the liquid crystal aligning agent of this invention differs according to the kind of other polymer added arbitrarily.

[0173] When the liquid crystal aligning agent of the present invention contains radiation-sensitive polysiloxane and at least one polymer selected from polyamic acid and polyimi...

Embodiment

[0201] Hereinafter, the present invention will be described more specifically by way of examples, but the present invention is not limited to these examples.

[0202] In the following examples, the weight average molecular weight is a polystyrene-equivalent value measured by gel permeation chromatography under the following conditions.

[0203] Column: manufactured by Tosoh Corporation, TSKgelGRCXLII

[0204] Solvent: tetrahydrofuran

[0205] Temperature: 40°C

[0206] Pressure: 68kgf / cm 2

[0207]

Synthetic example P

[0209] The cinnamic acid derivative (2-P4-1) was synthesized according to the following synthetic route 1.

[0210]

[0211] 91.3 g of methyl 4-hydroxybenzoate, 182.4 g of potassium carbonate, and 320 ml of N-methyl-2-pyrrolidone were added to a 1 L eggplant-shaped flask, and after stirring at room temperature for 1 hour, 99.7 g of 1-bromopentane was added. The reaction was carried out with stirring at 100°C for 5 hours. After the reaction was completed, reprecipitation was performed with water. Next, 48 g of sodium hydroxide and 400 ml of water were added to the precipitate, and the mixture was refluxed for 3 hours to perform a hydrolysis reaction. After the reaction was completed, it was neutralized with hydrochloric acid, and the resulting precipitate was recrystallized from ethanol to obtain 104 g of white crystals of compound (2-P4-1-1).

[0212] 104 g of this compound (2-P4-1-1) was taken into a reaction vessel, 1 L of thionyl chloride and 770 µl of N,N dimethylform...

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Abstract

Disclosed is a liquid crystal aligning agent containing a radiation-sensitive polysiloxane which is obtained by reacting at least one substance selected from the group consisting of polysiloxanes having a repeating unit represented by Formula (1), hydrolysis products thereof and condensates of the hydrolysis products, with a cinnamic acid derivative having at least one group selected from the group consisting of alkenyl groups and alkynyl groups. (1) (In Formula (1), Y1 represents a hydroxy group, an alkoxyl group having 1-10 carbon atoms, an alkyl group having 1-20 carbon atoms or an aryl group having 6-20 carbon atoms.)

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent, a method for forming a liquid crystal aligning film, and a liquid crystal display element. Background technique [0002] In the past, it is known that a nematic liquid crystal with positive dielectric anisotropy is made into a sandwich structure with a substrate with a liquid crystal alignment film and a transparent electrode, and the long axis of the liquid crystal molecule is continuously twisted between the substrates as needed. 360 ° of liquid crystal display elements with liquid crystal cells such as TN (Twisted Nematic) type, STN (Super Twisted Nematic) type, IPS (In Plane Switching) type (refer to Japanese Patent Laid-Open No. 56-91277 and Japanese Patent Laid-Open Publication No. 56-91277 1-120528). [0003] In such a liquid crystal cell, in order to align liquid crystal molecules in a predetermined direction with respect to the substrate surface, it is necessary to provide a li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1337C08G77/38C08L79/08
CPCC09K19/56G02F1/133719G02F1/133788C08G77/38
Inventor 秋池利之
Owner JSR CORPORATIOON
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