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

A technology of liquid crystal alignment agent and liquid crystal alignment film, which is applied in the directions of instruments, optics, nonlinear optics, etc., can solve the problems of insufficient bonding of substrates, water mixing, uneven display of liquid crystal display components, etc., to reduce the frame area, High adhesion, suppressing display unevenness

Active Publication Date: 2017-08-01
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the narrowing of the frame of the panel, the coating position of the sealant used in the production of the liquid crystal display element is changed to the position in contact with the end of the liquid crystal alignment film or coated on the liquid crystal alignment film, but since the polyimide Since there are no polar groups or few polar groups, covalent bonds are not formed with the sealant on the surface of the liquid crystal alignment film, and there is a problem that the adhesion between the substrates becomes insufficient
[0006] In such a case, especially in use under high-temperature and high-humidity conditions, water may easily mix in from the gap between the sealant and the liquid crystal alignment film, and display unevenness may occur around the frame around the liquid crystal display element. question

Method used

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

Examples

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Embodiment

[0144] The following examples are given to describe the present invention in more detail, but the present invention is not limited to these examples and explained. The abbreviations, analytical methods, analytical conditions, and methods of property evaluation of the compounds used are as follows.

[0145] NMP: N-methyl-2-pyrrolidone BCS: Butyl cellosolve

[0146] DMAP: Dimethylaminopyridine

[0147] Boc2O: di-tert-butyl dicarbonate

[0148] DMAP: Dimethylaminopyridine Pd / C: Palladium on Carbon

[0149] DIEPA: Diisopropylethylamine

[0150] DMF: Dimethylformamide

[0151] THF: Tetrahydrofuran

[0152]

[0153] ( 1 H-NMR measurement)

[0154] Device: Varian NMR system 400NB (400MHz) (manufactured by Varian Corporation) and JMTC-500 / 54 / SS (500MHz) (manufactured by JEOL Corporation)

[0155] Determination solvent: CDCl 3 (deuterochloroform), DMSO-d 6 (Deuterated Dimethyl Sulfoxide)

[0156] Reference material: TMS (tetramethylsilane) (δ: 0.0ppm, 1 H) and CDCl 3 (δ...

Synthetic example 1

[0176] Weigh DA-1 (0.42g, 2.8mmol) and DA-3 (1.67g, 4.2mmol) into a 50ml four-necked flask equipped with a stirring device and a nitrogen gas inlet tube, then add 21.7g of NMP, and stir while sending nitrogen gas Let it dissolve. Stirring this diamine solution, CA-1 (0.534g, 2.45mmol) and CA-2 (0.837g, 4.27mmol) were added, and 5.4g of NMP was further added. Then, it stirred for 3 hours, and obtained the polyamic-acid solution of 12 mass % of resin solid content concentration. The viscosity of the polyamic acid solution at 25° C. was confirmed to be 320 mPa·s using an E-type viscometer (manufactured by Toki Sangyo Co., Ltd.). The molecular weight of this polyamic acid was Mn=10,550, Mw=32,000.

Synthetic example 2

[0178] Weigh DA-1 (0.42g, 2.8mmol) and DA-4 (2.09g, 4.2mmol) into a 50ml four-neck flask equipped with a stirring device and a nitrogen gas inlet tube, then add 21.7g of NMP, and stir while sending nitrogen gas Let it dissolve. Stirring this diamine solution, CA-1 (0.534g, 2.45mmol) and CA-2 (0.837g, 4.27mmol) were added, and 5.4g of NMP was further added. Then, it stirred for 3 hours, and obtained the polyamic-acid solution of 12 mass % of resin solid content concentration. The viscosity of the polyamic acid solution at 25° C. was confirmed to be 370 mPa·s using an E-type viscometer (manufactured by Toki Sangyo Co., Ltd.). Mn of this polyamic acid was 19,000, and Mw was 50,500.

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Abstract

Provided is a liquid crystal aligning agent which forms a liquid crystal alignment film that exhibits good adhesion to a substrate and a sealing agent. A liquid crystal aligning agent that contains a polyimide precursor that is obtained by reacting a diamine component, which contains a diamine having a structure represented by formula (1), and a tetracarboxylic acid component with each other and / or a polyimide that is obtained by imidizing the polyimide precursor. (In formula (1), each of R1 and R2 represents a hydrogen atom, an alkyl group having 1-4 carbon atoms or a group represented by formula (2), and at least one of R1 and R2 represents a group represented by formula (2). In formula (2), A represents a single bond or a divalent group that is composed of a hydrocarbon group having 1-4 carbon atoms.)

Description

technical field [0001] This invention relates to the liquid crystal aligning agent, liquid crystal aligning film, and liquid crystal display element obtained using the diamine which has a specific structure. Background technique [0002] Currently, the liquid crystal aligning film of a liquid crystal display element mainly uses a liquid crystal aligning agent (also called a liquid crystal aligning agent) containing a polyimide-type polymer on a board|substrate, and the liquid crystal aligning film obtained by baking. [0003] The liquid crystal alignment film is used for the purpose of controlling the alignment state of the liquid crystal. However, with the high-definition of the liquid crystal display element, considering the requirements of suppressing the contrast reduction of the liquid crystal display element and reducing the afterimage phenomenon, the liquid crystal alignment film has voltage retention. It is particularly important to have characteristics such as high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337C08G73/10C08L79/08
CPCC08G73/10C08L79/08G02F1/1337
Inventor 结城达也川野勇太森本佳道新津新平
Owner NISSAN CHEM IND LTD
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