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

A technology for liquid crystal display elements and liquid crystal alignment agents, which is applied in liquid crystal materials, instruments, optics, etc., can solve the problems of liquid crystal alignment agents with high voltage retention and friction strength, poor display of liquid crystal display elements, and decreased yield of liquid crystal alignment films. Achieves the effect of reduced residual charge, excellent contrast, and high voltage retention

Active Publication Date: 2018-02-23
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the friction strength is too strong, excessive force will be applied between the film and the fabric, and the film and the fabric will be peeled off, which will reattach to the film.
The reattachment of such peelings will cause poor display in the liquid crystal display element, and therefore will lead to a decrease in the yield rate in the manufacturing process of the liquid crystal alignment film.
[0007] A liquid crystal alignment agent that can provide a liquid crystal alignment film with a high voltage retention rate and a low residual voltage after DC voltage application, and has a high frictional strength of the coating film has not been known so far.

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

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0231] I. Preparation of liquid crystal alignment agent

[0232] 133 parts by weight of the solution containing polyamic acid A1 obtained in the synthesis example A1 (the conversion amount of polyamic acid A1 is 20 parts by weight) and 533 parts by weight of the solution containing polyamic acid B1 (the conversion amount of polyamic acid A1 is 80 parts by weight) are mixed, NMP, BL and butyl cellosolve (butylcellosolve, BC) are added, and the preparation solvent is composed of NMP: BL: BC=40: 40: 20 (weight ratio), and the polymer concentration is a solution of 4% by weight , as a liquid crystal alignment agent.

[0233] II. Evaluation of liquid crystal alignment agent

[0234] (1) Evaluation of storage stability

[0235]Collect 250mL of the prepared liquid crystal alignment agent, store it in an environment of -15°C, and use a particle counter (manufactured by Rion Co., Ltd., model "KL-11A") to measure the initial stage (just after preparation), After 2 weeks, 4 weeks, 8 w...

Embodiment 2～ Embodiment 6 and comparative example 1～ comparative example 5

[0253] In the "I. Preparation of liquid crystal alignment agent" of Example 1, except that the type and amount of polyamic acid contained in the polymer solution used were set as described in Table 2, the same A liquid crystal alignment agent was prepared and evaluated in the same manner as in Example 1.

[0254] The evaluation results are shown in Table 2.

[0255]

[0256] In Table 2, "M" of Comparative Example 1, Comparative Example 2 and Comparative Example 5 A / M B The values ​​in parentheses in the " column are the ratio of the number of moles of carboxyl groups to the number of moles of tertiary nitrogen atoms in other polymers used in these comparative examples.

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Abstract

The invention provides a liquid crystal aligning agent, a liquid crystal alignment film, and a liquid crystal display device, which take account of the abrasion resistance of a film and good electric properties (high voltage holding rate and inhibited residual voltage) of the liquid crystal alignment film. The liquid crystal aligning agent contains: (A) polymers having the structure from diamine containing carboxyl, and (B) polymers having the structure from diamine containing three-level nitrogen atoms, wherein the ratio of the mole number MA of carboxyl groups in the polymers (A) to the mole number MB of the three-level nitrogen atoms in the polymers (B), MA / MB, is 0.15 to 3.50.

Description

technical field [0001] The invention relates to a liquid crystal alignment agent. In detail, this invention relates to the liquid crystal alignment agent which can provide the liquid crystal display element which is excellent not only in the rubbing resistance of the formed coating film but also in the afterimage characteristic excellent in long-term continuous drive. Background technique [0002] In liquid crystal display elements, a variety of driving methods with different electrode structures, physical properties of liquid crystal molecules used, and manufacturing steps have been developed. For example, twisted nematic (TN) type and super-twisted nematic (super-twisted) type are known. nematic (STN) type, vertical alignment (vertical alignment, VA) type, multi-domain vertical alignment (multi-domain vertical alignment, MVA) type, in-plane switching (IPS) type, fringe field switching (fringe field) Switching (FFS) type, polymer-sustained alignment (PSA) type and other li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/56G02F1/1337
CPCC08G73/1007C08L79/08C09K19/56G02F1/133723
Inventor 角谷宪一黑田美彦
Owner JSR CORPORATIOON
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