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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 liquid crystal materials, instruments, optics, etc. It can solve the problems of small anisotropy of polymer films, failure to obtain liquid crystal orientation, and image sticking, etc., and achieve good image sticking characteristics, suppression of bright spots, and high reliability

Active Publication Date: 2019-10-11
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, compared with the liquid crystal aligning film obtained by rubbing treatment, the liquid crystal aligning film obtained by the photo-alignment method has a problem that the anisotropy with respect to the orientation direction of the polymer film is small.
If the anisotropy is small, sufficient liquid crystal orientation cannot be obtained, and when forming a liquid crystal display element, there are problems such as image sticking.

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

Experimental program
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Effect test

Embodiment

[0144] The following examples are given to describe the present invention in more detail, but the present invention is not limited or interpreted by them.

[0145] The abbreviations and measurement methods of the compounds used in the following are as follows.

[0146] NMP: N-methyl-2-pyrrolidone

[0147] BCS: Butyl Cellosolve

[0148] DA-1: 1,2-bis(4-aminophenoxy)ethane

[0149] DA-2: 1,3-bis(4-aminophenoxy)propane

[0150] DA-3: p-phenylenediamine

[0151] DA-6: 4-(2-(Methylamino)ethyl)aniline

[0152]

[0153] [viscosity]

[0154] For the viscosity of polyamic acid ester and polyamic acid solution, using E-type viscometer TVE-22H (manufactured by Toki Sangyo Co., Ltd.), the sample volume is 1.1mL, and the cone rotor TE-1 (1 ° 34', R24) , Measured at a temperature of 25°C.

[0155] [molecular weight]

[0156] The molecular weight of the polyamic acid ester is measured using a GPC (normal temperature gel permeation chromatography) device, and the number average mol...

Synthetic example 1

[0182]Take DA-1 0.81g (3.30mmol), DA-20.57g (2.20mmol), DA-3 0.36g (3.30mmol), DA-4 0.88 g (2.20 mmol), NMP29.99g was added, and stirring and dissolution were carried out while feeding nitrogen gas. While stirring this diamine solution, 2.35 g (10.51 mmol) of 1,3-dimethyl-1,2,3,4-cyclobutanetetracarboxylic dianhydride was added so that the solid content concentration became 12 mass % to add NMP 6.40g and stir at room temperature for 24 hours to obtain a polyamic acid solution (A). The viscosity of this polyamic acid solution at a temperature of 25° C. was 316 mPa·s. In addition, the molecular weight of this polyamic acid was Mn=13230, Mw=29550.

Synthetic example 2

[0184] Take DA-1 0.54g (2.20mmol), DA-20.85g (3.30mmol), DA-3 0.36g (3.30mmol), DA-4 0.88 g (2.20 mmol), NMP30.17g was added, and stirring and dissolution were carried out while feeding nitrogen gas. While stirring this diamine solution, 2.35 g (10.51 mmol) of 1,3-dimethyl-1,2,3,4-cyclobutanetetracarboxylic dianhydride was added so that the solid content concentration became 12 mass % to add NMP 6.34g and stir at room temperature for 24 hours to obtain a polyamic acid solution (B). The viscosity of this polyamic acid solution at a temperature of 25° C. was 356 mPa·s. In addition, the molecular weight of this polyamic acid was Mn=14120, Mw=31210.

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Abstract

Provided are: a liquid crystal aligning agent for obtaining an alignment film that is suitable for photo-alignment and enables the achievement of good afterimage characteristics without producing bright dots even if used for negative liquid crystals; a liquid crystal alignment film; and a liquid crystal display element. A liquid crystal aligning agent which contains at least one polymer (A) that is selected from the group consisting of polyimide precursors having a structural unit represented by formula (1) and a structural unit represented by formula (2) and imidized polymers of the polyimideprecursors. In the formulae, the symbols are as defined in the description.

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent suitable for photo-alignment treatment, a liquid crystal aligning film obtained from the liquid crystal aligning agent, and a liquid crystal display element using the liquid crystal aligning film. Background technique [0002] In liquid crystal display elements used in liquid crystal televisions, liquid crystal displays, etc., a liquid crystal aligning film for controlling the alignment state of liquid crystals is usually provided in the element. As the liquid crystal aligning film, a liquid crystal aligning agent mainly composed of a polyimide precursor such as polyamide acid and a solution of soluble polyimide is applied to a glass substrate and fired. Polyimide-based liquid crystal alignment film. According to the most popular method in the industry, the liquid crystal aligning film is formed on the surface of the polyimide-based liquid crystal aligning film on the electrode substrate...

Claims

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Application Information

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IPC IPC(8): G02F1/1337
CPCG02F1/1337C09K19/56C08L79/08C08G73/1046
Inventor 松本欣也桥本淳作本直树
Owner NISSAN CHEM IND LTD