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Liquid crystal alignment agent, liquid crystal alignment film, liquid crystal alignment film forming method, liquid crystal display element

A liquid crystal alignment agent, liquid crystal alignment technology, applied in the direction of liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problems of large cumulative exposure, insufficient sensitivity, etc., achieve high radiation sensitivity, reduce production costs, electrical Excellent effect

Inactive Publication Date: 2013-06-05
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional photo-alignment method using polyimide resin, polyamic acid, etc. has the following disadvantages: the sensitivity is not sufficient, and a large cumulative exposure amount is required.

Method used

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  • Liquid crystal alignment agent, liquid crystal alignment film, liquid crystal alignment film forming method, liquid crystal display element
  • Liquid crystal alignment agent, liquid crystal alignment film, liquid crystal alignment film forming method, liquid crystal display element
  • Liquid crystal alignment agent, liquid crystal alignment film, liquid crystal alignment film forming method, liquid crystal display element

Examples

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Effect test

example

[0148] Hereinafter, the present invention will be described more specifically by way of examples, but the present invention is not limited by these examples.

[0149]

[0150] A compound represented by the following formula (B-1) was synthesized according to the following scheme.

[0151] [chemical 6]

[0152]

Synthetic example 1

[0154] Add 2.00 g of (E)-cinnamic acid to 10 mL of a water / ethanol=1 / 1 solution, and heat to 90° C. in an oil bath to completely dissolve it. The setting of the oil bath was set at 50° C., crystallization was gradually advanced, and 1.3 g (yield: 65%) of α-crystals of (E)-cinnamic acid were obtained. 150 mg of the α-crystals obtained by recrystallization were pulverized in a mortar until they became powdery, and were sandwiched between two Pyrex (registered trademark) glass plates to obtain uniform thickness. Light irradiation was performed for 4 hours using a 500 W high-pressure mercury lamp to obtain 147 mg of the compound (B-1) represented by the above formula (B-1). In addition, by repeating the synthesis at the above-mentioned scale, the necessary amount in the synthesis examples of the polyesters to be described later can be ensured.

[0155]

[0156] Diepoxide compounds used in the synthesis of polyester are shown below.

[0157] [chemical 7]

[0158]

example 1

[0160] 0.1 mol (29.62g) of the compound (B-1) and 0.1 mol (17.72g) of the diepoxy compound (E-1) represented by the above formula (E-1) were dissolved in N-methyl-2-pyrrolidone 110.46 g, reacted at 140° C. for 9 hours. Next, the reaction mixture was mixed with a large excess of methanol to precipitate the reaction product. Then, it wash|cleaned with methanol, it dried at 40 degreeC under reduced pressure for 15 hours, and obtained 45.9 g of polyester (A-1) (yield rate: 97.0%).

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Abstract

An object of the invention is to provide a liquid crystal alignment agent which has excellent radiosensitivity and shows good liquid crystal alignment properties in the low-irradiation photo alignment method. A liquid crystal alignment film forming method using the liquid crystal alignment agent and a liquid crystal alignment film are provided. A liquid crystal display element which contains the liquid crystal alignment film and has excellent performances, such as electrical properties, in addition to the liquid crystal alignment properties, is provided. Further, a compound which serves as material of the liquid crystal alignment agent is provided. The liquid crystal alignment agent provided by the invention comprises an [A] polymer which has a structural unit (I) containing a radical represented by the following formula (1) or a radical represented by the following formula (2). Besides, the [A] polymer is preferably polyester or polythioester.

Description

technical field [0001] The invention relates to a liquid crystal alignment agent suitable for photo-alignment, a liquid crystal alignment film, a method for forming the liquid crystal alignment film and a liquid crystal display element. Background technique [0002] Liquid crystal displays (LCDs) are widely used in televisions or various displays. There are liquid crystal units such as twisted nematic (Twisted Nematic, TN) type, super twisted nematic (Super Twisted Nematic, STN) type, in-plane switching (In Plane Switching, IPS) type, etc. in the display elements of the LCD, and there are also known Change the electrode structure of the IPS type, etc., and increase the numerical aperture of the display element part to improve the fringe field switching (Fringe Field Switching, FFS) type, etc. -120528 Bulletin). [0003] The method for aligning the liquid crystals of this liquid crystal cell is known: the method of utilizing rubbing treatment, that is, forming an organic fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/56G02F1/1337G02F1/1333C08G63/66C08G75/26
CPCC08G63/02C08G75/26C08L67/00C08L81/00C09K19/56G02F1/1337
Inventor 秋池利之阿部翼宫本佳和永尾隆杉山文隆
Owner JSR CORPORATIOON
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