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Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element

A technology of liquid crystal display elements and liquid crystal alignment agents, which is applied in the direction of liquid crystal materials, optics, instruments, etc., can solve the problems of reworkability (reduced peelability, etc.), and achieve the effect of excellent reworkability and good electrical properties

Active Publication Date: 2016-02-24
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if a conventional liquid crystal alignment agent having an epoxy group is used, the reworkability (peelability) of the liquid crystal alignment film may decrease due to the crosslinking reaction of the epoxy group during baking.

Method used

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  • Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element
  • Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element
  • Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element

Examples

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example

[0167] Hereinafter, although this invention is demonstrated in full detail based on an example, this invention is not interpreted limitedly based on description of this example.

[0168]

Synthetic example 1

[0170] 22.4 g (0.1 mol) of 2,3,5-tricarboxycyclopentylacetic dianhydride (TCA) as tetracarboxylic dianhydride, and 2.6 g (0.02 mol) of p-phenylenediamine (PDA) as diamine , 10.4 g (0.02 mol) of 3,5-diaminobenzoic acid cholestyl ester (HCDA) and 9.1 g (0.06 mol) of 3,5-diaminobenzoic acid (DAB) were dissolved in N-methyl-2- The reaction was performed at 60 degreeC for 6 hours in 176 g of pyrrolidone (NMP), and the solution containing the polyamic acid of 10 mass % was obtained. The solution viscosity of the obtained polyamic acid solution was 102 mPa··s. Next, 410 g of NMP was added to the obtained polyamic-acid solution, and 7.9 g of pyridine and 10.2 g of acetic anhydride were added, and the dehydration ring-closure reaction was performed at 110 degreeC for 4 hours. After the dehydration ring-closing reaction, the solvent in the system was replaced with new NMP (the pyridine and acetic anhydride used in the dehydration ring-closing reaction were removed from the system), the...

Synthetic example 2

[0172] 22.3 g (0.1 mol) of TCA as tetracarboxylic dianhydride, 3.9 g (0.02 mol) of 4,4'-diaminodiphenylmethane (DDM) as diamine, 5.2 g (0.01 mol) of HCDA, Cholesteryloxy-2,4-diaminobenzene (HCODA) 4.9g (0.01 mole) and DAB9.1g (0.06 mole) were dissolved in NMP182g, and the reaction was carried out at 60°C for 6 hours to obtain 10 mass % polyamic acid solution. The solution viscosity of the obtained polyamic acid solution was 117 mPa··s. Next, 423 g of NMP was added to the obtained polyamic-acid solution, and 10.2 g of pyridine and 13.2 g of acetic anhydride were added, and the dehydration ring-closure reaction was performed at 110 degreeC for 4 hours. After the dehydration ring-closing reaction, the solvent in the system was replaced with new NMP to obtain a solution containing 15% by mass of a polyimide (A-2) having an imidation rate of about 67%. A small amount of the obtained polyimide solution was fractionated, and NMP was added to prepare a solution having a polyimide co...

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Abstract

The invention provides a liquid crystal alignment agent, a liquid crystal alignment film and a liquid crystal display element. Even under bad conditions of photostress, heat and humidity and long-time continuous driving, good electric features of the liquid crystal alignment agent can be maintained. The liquid crystal alignment film can have good reprocessing performance even if disadvantages occur. The liquid crystal alignment agent comprises (A) at least one polymer selected from a group composed of polyamic acid and polyimide formed by defydration and closing of the polyamic acid, (B) antioxidant and (C) compound with epoxy group.

Description

technical field [0001] The invention relates to a liquid crystal alignment agent, a liquid crystal alignment film and a liquid crystal display element. Background technique [0002] Now known to have TN (TwistedNematic, twisted nematic) type, STN (SuperTwistedNematic, super twisted nematic) type, VA (VerticalAlignment, vertical alignment) type, IPS (In-PlaneSwitching, coplanar conversion) type, OCB (OpticalCompensatedBend , Optically compensated bending) liquid crystal display elements such as display modes. In any of these display modes, the alignment state of liquid crystal molecules is controlled by the liquid crystal alignment film, so the characteristics of the liquid crystal alignment film and the liquid crystal alignment agent used as the material of the liquid crystal alignment film affect the performance of the liquid crystal display element. [0003] As the material of the liquid crystal alignment agent, polyamic acid, polyimide, polyamide, polyester and other res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/56G02F1/1337G02F1/1333
Inventor 内山克博平井刚
Owner JSR CORPORATIOON
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