Liquid crystal aligning agent suitable for photo-lignment process, and liquid crystal alignment film using same

A technology of liquid crystal alignment agent and liquid crystal alignment film, which is applied in optics, nonlinear optics, coating, etc., and can solve problems such as insufficient stability

Active Publication Date: 2013-08-21
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stability of these properties such as the alignment control force of liquid crystals of the liquid crystal alignment film obtained by the photo-alignment method and the electrical properties of the liquid crystal display element is insufficient, and it is difficult to satisfy the above-mentioned properties.

Method used

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  • Liquid crystal aligning agent suitable for photo-lignment process, and liquid crystal alignment film using same
  • Liquid crystal aligning agent suitable for photo-lignment process, and liquid crystal alignment film using same
  • Liquid crystal aligning agent suitable for photo-lignment process, and liquid crystal alignment film using same

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0212] Take 2.92g (27.0mmol) of p-phenylenediamine and 0.67g (3.0mmol) of DA-1 in a 100mL four-necked flask with a stirring device and a nitrogen inlet tube, add 52.27g of NMP, and stir while feeding nitrogen Let it dissolve. While stirring the diamine solution, 6.66 g (29.7 mmol) of 1,3-dimethyl-1,2,3,4-cyclobutanetetracarboxylic dianhydride was added, and NMP was added to make the solid content concentration 15 % by weight, stirred at room temperature for 24 hours to obtain a solution of polyamic acid (PAA-1). The viscosity of the polyamic acid solution at a temperature of 25° C. was 680 mPa·s. In addition, the molecular weight of this polyamic acid is Mn=9279, Mw=21886.

Synthetic example 2

[0214] Take 2.60g (24.0mmol) of p-phenylenediamine and 1.34g (6.0mmol) of DA-1 in a 100mL four-neck flask with a stirring device and a nitrogen inlet tube, add 52.65g of NMP, and stir while feeding nitrogen Let it dissolve. While stirring the diamine solution, 6.59 g (29.4 mmol) of 1,3-dimethyl-1,2,3,4-cyclobutanetetracarboxylic dianhydride was added, and NMP was added to make the solid content concentration 15 % by weight, stirred at room temperature for 24 hours to obtain a solution of polyamic acid (PAA-2). The viscosity of the polyamic acid solution at a temperature of 25° C. was 357 mPa·s. In addition, the molecular weight of this polyamic acid is Mn=9042, Mw=19958.

Synthetic example 3

[0216] Take 1.94g (17.9mmol) of p-phenylenediamine and 0.44g (1.97mmol) of DA-1 in a 100mL four-port burning screen with a stirring device and a nitrogen introduction tube, add 49.86g of NMP, and feed in nitrogen while Stir to dissolve. While stirring this diamine solution, add 3.77g (19.2mmol) of 1,2,3,4-cyclobutanetetracarboxylic dianhydride, and then add NMP to make the solid content concentration 10% by weight, and stir at room temperature for 24 hours , to obtain a solution of polyamic acid (PAA-3). The viscosity of the polyamic acid solution at a temperature of 25° C. was 142 mPa·s. In addition, the molecular weight of this polyamic acid is Mn=11494, Mw=24376.

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Abstract

Provided is a liquid crystal alignment film which suppresses afterimages caused by AC drive in an IPS- or FFS-driven liquid crystal display element, and which exhibits fast relaxation of residual charges accumulated by DC voltage. Also provided is a liquid crystal aligning agent suitable for use in a photo-alignment process in order to obtain the liquid crystal alignment film. The liquid crystal aligning agent suitable for use in a photo-alignment process comprises: at least one polymer (component (A)) selected from polyamic acid and imidized polyamic acid polymers obtained by reacting a tetracarboxylic dianhydride provided with a specific structure having a cyclobutane backbone, and a diamine compound that has at least one diamine selected from the group having the structures represented by formulae (D-1) and (D-2), and that has an amino group protected by a thermally cleavable group which is replaced by hydrogen at heating; at least one polymer (component (B)) selected from polyamic acid and imidized polyamic acid polymers obtained by reacting a tetracarboxylic dianhydride and a diamine compound which contains a diamine having a nitrogen-containing aromatic heterocycle such as pyridine; and an organic solvent.

Description

technical field [0001] This invention relates to the liquid crystal aligning agent used for manufacture of a liquid crystal aligning film, and the liquid crystal aligning film obtained from this liquid crystal aligning agent. In more detail, the present invention relates to a liquid crystal aligning agent and a liquid crystal aligning film obtained from the liquid crystal aligning agent. The liquid crystal aligning agent is suitable for the photo-alignment treatment method that replaces the rubbing treatment, that is, it is suitable for irradiation of ultraviolet rays that can be polarized. Formation of liquid crystal alignment film to impart liquid crystal alignment ability. Background technique [0002] The liquid crystal display element used for a liquid crystal television, a liquid crystal display, etc. is normally provided with the liquid crystal aligning film for controlling the orientation state of a liquid crystal in an element. [0003] According to the most popula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337C08G73/10
CPCC08G73/1042C08G73/1078C09D179/08G02F1/133711G02F1/133788G02F1/134363G02F1/134372C08G73/10G02F1/1337
Inventor 野口勇步堀隆夫饭沼洋介作本直树
Owner NISSAN CHEM IND LTD
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