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Liquid crystal aligning agent, liquid crystal alignment film and liquid crystal display device

A liquid crystal alignment agent and solvent technology, applied in liquid crystal materials, instruments, optics, etc., can solve the problems of printability reduction, achieve good printability, inhibit oxidation degradation, and maintain electrical characteristics

Active Publication Date: 2013-05-22
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when an antioxidant is contained in a liquid crystal alignment agent, a defect that printability decreases occurs

Method used

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

Examples

Experimental program
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Effect test

example

[0154] Hereinafter, the present invention will be described more specifically by way of examples, but the present invention is not limited by these examples.

[0155] The solution viscosity of each polymer solution in a synthesis example, and the imidization rate of a polyimide can be measured by the following method.

[0156] Solution Viscosity of Polymer Solution

[0157] The solution viscosity [mPa·s] of the polymer solution can be measured at 25° C. using an E-type rotational viscometer for a solution prepared to have a polymer concentration of 10% by weight using a predetermined solvent.

[0158] Imidation rate of polyimide

[0159] Put the polyimide solution into pure water, dry the obtained precipitate under reduced pressure at room temperature, dissolve it in deuterated dimethyl sulfoxide, and measure it at room temperature with tetramethylsilane as the standard substance 1 H-NMR. according to income 1 From the H-NMR spectrum, the imidation rate [%] was calculated|...

example 1

[0183] In the solution containing 100 parts by weight of the synthesized polyimide (PI-1), 3 parts by weight of IRGANOX1010 (BASF Japan company), NMP as a solvent, ethylene glycol mono-n-butyl ether (BC) and 1,3-dimethyl-2-imidazolidinone (DMI), the solvent composition is NMP: BC: DMI=30 :50:20 (weight ratio), a solution with a solids concentration of 6.5% by weight. This solution was filtered using a filter with a pore diameter of 1 μm, thereby preparing a liquid crystal alignment agent.

example 2～ example 14、 comparative example 1～ comparative example 7

[0185] The liquid crystal alignment agent was prepared respectively by the method similar to the said Example 1 except having changed the polyimide used, antioxidant, and solvent composition as described in following Table 1, respectively.

[0186] Evaluation of printability

[0187] Printability was evaluated about each liquid crystal alignment agent prepared above. Evaluation was performed as follows. First, use a liquid crystal alignment film printing machine (manufactured by Nippon Photo Printing Machine Co., Ltd., Angstromer, model "S40L-532") for each liquid crystal alignment agent of the prepared liquid crystal alignment agent. The dropwise amount was 20 drops (approximately 0.2 g) back and forth, and applied to the transparent electrode surface of a glass substrate with a transparent electrode made of an ITO film. Coating on the substrate was performed 20 times using a new substrate at intervals of 1 minute.

[0188] Next, distribute the liquid crystal alignment age...

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Abstract

The invention provides a liquid crystal aligning agent, a liquid crystal alignment film and a liquid crystal display device. The liquid crystal aligning agent contains: A, at least one polymer (a) selected from groups consisted of polyamic acid and polyimide, wherein the polyamic acid is obtained by reacting tetracarboxylic dianhydride with diamine, and the polyimide is obtained by dehydrating the polyamic acid so as to close ring; B, an antioxidant (b); C, at least one solvent (c) selected from groups consisted of 1,3-dimethyl-2-imidazolidinone, N-ethyl-2-pyrrolidinone, and a compound represented by a formula (1).

Description

technical field [0001] The invention relates to a liquid crystal alignment agent, a liquid crystal alignment film and a liquid crystal display element, in particular to a liquid crystal alignment agent with good printability and used to obtain a liquid crystal display element with good electrical properties after long-time driving, and a liquid crystal alignment agent using the liquid crystal alignment film. The liquid crystal alignment film and liquid crystal display element made by the agent. Background technique [0002] In the past, liquid crystal display elements were known as horizontal alignment liquid crystal display elements such as twisted nematic (TN) mode, in-plane switching (In-Plane Switching, IPS) mode, fringe field switching (Fringe Field Switching, FFS) mode, etc. , or a vertical alignment liquid crystal display element such as a vertical alignment (Vertical Alignment, VA) mode. These liquid crystal display elements include a liquid crystal alignment film f...

Claims

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Application Information

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IPC IPC(8): C09K19/56C08G73/10G02F1/1337G02F1/1333
CPCC08G73/1032C08K5/005C08K5/13C08K5/17C08L79/08C09K19/56G02F1/133723
Inventor 内山克博野口峻一
Owner JSR CORPORATIOON
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