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

A technology of liquid crystal alignment agent and substituent, which is applied in the direction of instruments, optics, nonlinear optics, etc. It can solve the problems of low stability, low contrast, and the failure of liquid crystal to return to the initial state, etc., and achieve good adhesion and excellent contrast , the effect of suppressing the deviation of lightness

Pending Publication Date: 2021-07-23
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, there is a problem that charges are accumulated in the liquid crystal alignment film due to the voltage for driving the liquid crystal, which affects the display as afterimages or afterimages (hereinafter referred to as afterimages derived from residual DC), and deteriorates the display quality of the liquid crystal display element. Since the level is remarkably lowered, a liquid crystal aligning agent overcoming these problems has been proposed (see Patent Document 2)
If the alignment stability is low, the liquid crystal cannot return to the initial state when the liquid crystal is driven for a long time, which causes a decrease in contrast and afterimage (hereinafter referred to as AC afterimage)

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
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Effect test

Embodiment

[0174] Hereinafter, although an Example is given and this invention is demonstrated more concretely, this invention is not limited to these. The abbreviations of the following compounds and the measurement methods of each characteristic are as follows.

[0175] (solvent)

[0176] NMP: N-methyl-2-pyrrolidone, GBL: γ-butyrolactone. BCS: butyl cellosolve.

[0177] (diamine)

[0178] DA-1 to DA-8: compounds represented by the following formulas (DA-1) to (DA-8).

[0179] (tetracarboxylic dianhydride)

[0180] CA-1 to CA-4: compounds represented by the following formulas (CA-1) to (CA-4).

[0181] (additive)

[0182] C-1: a compound represented by the following formula (C-1).

[0183] C-2: 2,2'-bis(4-hydroxy-3,5-dihydroxymethylphenyl)propane.

[0184]

[0185] S-1: a compound represented by the following formula (S-1).

[0186]

[0187]

[0188] The measurement was performed at a temperature of 25° C. using an E-type viscometer TVE-22H (manufactured by Toki Sangyo ...

Synthetic example

[0194] Hereinafter, synthesis examples of polyamic acid and polyimide are shown. In addition, in these names, A represents (A) component, B represents (B) component, and PI represents polyimide.

[0195]

[0196]Measure 4.89g (20.0mmol) DA-1, 2.59g (24.0mmol) DA-2, 4.61g (20.0mmol) DA-3 and Add 5.46g (16.0mmol) of DA-5, add 197g of NMP, and stir to dissolve while feeding nitrogen. While stirring this diamine solution, 14.2 g (63.2 mmol) of CA-1 and 3.00 g (12.0 mmol) of CA-2 were added and stirred at 40° C. for 24 hours to obtain a polyamic acid solution (A-1,) ( Viscosity: 425mPa·s).

[0197]

[0198] Measure 52.6g (0.264mol) of DA-7 and 13.1g (0.066mol) of DA-8 into a 1L separable flask equipped with a stirring device and a nitrogen inlet tube, add 481.7g of NMP, and feed nitrogen while Stir to dissolve. While stirring this diamine solution, 41.3 g (0.165 mol) of CA-2 and 124.5 g of NMP were added, and it was made to react at 50 degreeC for 4 hours. Then, 45.1 g (0....

Embodiment 2

[0215] Measure 3.00g of polyimide solution (A-1-PI) and 3.60g of polyamic acid solution (B-3) into the 20ml sample tube with stirring bar, and further add 0.63g of NMP, 3.60g of GBL, 3.0 g of BCS, 0.90 g of a GBL solution containing 1% by weight of S-1, and 0.27 g of an NMP solution containing 10% by weight of C-1 were stirred with a magnetic stirrer for 30 minutes to obtain a liquid crystal aligning agent (2).

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Abstract

Provided are: a liquid crystal alignment film that exhibits good resistance to AC image persistence or residual DC-derived image persistence, and has good adhesion to a sealing agent; and a liquid crystal alignment agent that can be used to obtain a liquid crystal display element which inhibits in-plane variations in brightness during black displaying, and has excellent contrast characteristics. This liquid crystal alignment agent is characterized by containing component (A) and component (B). Component (A): a polymer (A) having a repeating unit represented by formula (1). Component (B): a polymer (B) having a repeating unit represented by formula (3). (In formula (1), R1-R4 each represent a hydrogen atom, a halogen atom, an alkyl group having 1-6 carbon atoms, or the like, at least one of R1-R4 is a group as defined above but, excluding a hydrogen atom. Y1 represents a divalent organic group having a moiety structure represented by formula (H). In formula (3), X3 represents a tetravalent organic group derived from an aromatic acid dianhydride, Y3 represents a divalent organic group having a moiety structure represented by formula (m). R30 represents a hydrogen atom or an alkyl group having 1-4 carbon atoms. Z31 and Z32 each represent a hydrogen atom or the like.) (Q3 represents -(CH2)n- (n is 2-20), any -CH2- may be substituted by -O-. Note that oxygen atoms are not directly bonded together. Any hydrogen atom on the benzene ring may be substituted by a monovalent organic group. * represents a bond.).

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent, a liquid crystal aligning film, and a liquid crystal display element using the liquid crystal aligning film. Background technique [0002] Conventional liquid crystal devices are widely used as display units of personal computers, smartphones, mobile phones, televisions, and the like. A liquid crystal device includes, for example, a liquid crystal layer sandwiched between an element substrate and a color filter substrate; a pixel electrode and a common electrode that apply an electric field to the liquid crystal layer; an alignment film that controls the orientation of liquid crystal molecules in the liquid crystal layer; and a thin film transistor ( TFT: Thin Film Transistor) performs switching (switching) and the like on electrical signals supplied to the pixel electrodes. As the driving method of liquid crystal molecules, longitudinal electric field methods such as TN (Twisted Nemati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337C08G73/10
CPCC08G73/10G02F1/1337C08G73/1046
Inventor 名木达哉福田一平石川和典中原翔一朗
Owner NISSAN CHEM IND LTD
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