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Liquid crystal aligning agent for in-plane switching

A technology of transverse electric field and liquid crystal alignment, applied in the direction of instruments, optics, nonlinear optics, etc., can solve the problems of peeling, affecting, and damaging the performance of liquid crystal alignment film, and achieve the effect of excellent adhesion

Active Publication Date: 2015-11-11
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, brushing treatment is an industrially used liquid crystal alignment treatment method, but there is a problem that the liquid crystal alignment film is peeled off from the substrate due to friction during brushing, or the liquid crystal alignment film is damaged, which affects the display characteristics.

Method used

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  • Liquid crystal aligning agent for in-plane switching
  • Liquid crystal aligning agent for in-plane switching
  • Liquid crystal aligning agent for in-plane switching

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0137] The following examples are given to illustrate the present invention in more detail, but the present invention is not limited to these examples. The abbreviations used in the following Examples and Comparative Examples are as follows.

[0138]

[0139] CA-1: 1,2,3,4-cyclobutanetetracarboxylic dianhydride

[0140] CA-2: Bicyclo[3.3.0]octane-2,4,6,8-tetracarboxylic dianhydride (the content of isomer [IV] is 97%)

[0141] CA-3: pyromellitic dianhydride

[0142] CA-4: 3,4-dicarboxy-1,2,3,4-tetrahydro-1-naphthalene succinic dianhydride

[0143]

[0144] DA-1: 1,5-bis(4-aminophenoxy)pentane

[0145] DA-2: 3,5-diaminobenzoic acid

[0146] DA-3: N-(3-pyridylmethyl)-3,5-diaminobenzamide

[0147] DA-4: 3-aminobenzylamine

[0148] DA-5: p-phenylenediamine

[0149] DA-6: 1,3-Diamino-4-n-dodecyloxybenzene

[0150] DA-7: 4,4’-Diaminodiphenylmethane

[0151] DA-8: 4,4’-Diaminodiphenylamine

[0152]

[0153] BCS: Butyl Cellosolve

[0154] NMP: N-methyl-2-pyrrolidone

...

Synthetic example 1

[0166] DA-1 (14.32g, 50.0mmol), DA-2 (4.56g, 30.0mmol), DA-3 (4.85g, 20.0mmol) and CA-2 (12.51g, 50.0mmol) in NMP (207.4g) Mix in medium and react at 50°C for 6 hours. Then, CA-1 (9.51g, 48.5mmol) and NMP (51.9g) were added, it was made to react overnight at 40 degreeC, and the polyamic-acid solution (1) whose resin solid content concentration was 15 mass % was obtained.

[0167] After adding NMP to the obtained polyamic-acid solution (1) (100.0g) and diluting to 5 mass %, acetic anhydride (22.41g) and pyridine (8.69g) were added as an imidization catalyst, and it was made to react at 50 degreeC for 2 hours. This reaction solution was poured into methanol (1500 ml), and the resulting precipitate was collected by filtration. This deposit was wash|cleaned with methanol, it dried under reduced pressure at 100 degreeC, and obtained the polyimide powder (1). The imidization rate of this polyimide was 50%, the number average molecular weight was 24,800, and the weight average mole...

Synthetic example 2

[0169] DA-1 (18.61g, 65.0mmol), DA-2 (5.93g, 39.0mmol), DA-3 (6.30g, 26.0mmol) and CA-2 (24.40g, 97.5mmol) in NMP (195.3g) Mix in medium and react at 50°C for 6 hours. Then, CA-1 (5.79g, 29.5mmol) and NMP (48.8g) were added, it was made to react overnight at 40 degreeC, and the polyamic-acid solution (2) whose resin solid content concentration was 20 mass % was obtained.

[0170]After adding NMP to the obtained polyamic-acid solution (2) (100.0g) and diluting to 5 mass %, acetic anhydride (10.87g) and pyridine (8.43g) were added as an imidation catalyst, and it was made to react at 90 degreeC for 2.5 hours. This reaction solution was poured into methanol (1500 ml), and the obtained precipitate was collected by filtration. This deposit was wash|cleaned with methanol, and it dried under reduced pressure at 100 degreeC, and obtained the polyimide powder (2). The imidization rate of this polyimide was 50%, the number average molecular weight was 24,800, and the weight average mo...

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Abstract

Provided are: a liquid crystal aligning agent which is capable of eliminating a feeling of strangeness about the color of a display screen in an in-plane switching liquid crystal display element, said feeling of strangeness being based on a black component; a liquid crystal alignment film; and a liquid crystal display element. A liquid crystal aligning agent for in-plane switching, which is characterized by containing a polyimide that is obtained by ring-closing a polyimide precursor that has a structural unit represented by formula (1) as a structural unit that is derived from a tetracarboxylic acid dianhydride. In formula (1), X1 represents a tetravalent organic group represented by formula (X1); and R1 represents a hydrogen atom or an alkyl group having 1-10 carbon atoms.

Description

technical field [0001] This invention relates to the liquid crystal aligning agent used for the liquid crystal element of a transverse electric field drive system, the liquid crystal aligning film using the same, and the liquid crystal element of a transverse electric field drive system. Background technique [0002] Liquid crystal display devices are display devices that utilize the electro-optical changes of liquid crystals. The characteristics of the device, such as small size, light weight, and low power consumption, have attracted attention. In recent years, it has achieved remarkable development as a display device for various displays. [0003] As a liquid crystal display device, there are following forms: a form in which liquid crystal molecules aligned parallel to a pair of opposing transparent substrates are driven by applying an electric field in a direction perpendicular to the substrates; It is expressed in the form of driving by applying an electric field in th...

Claims

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Application Information

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IPC IPC(8): G02F1/1337C08G73/10
CPCG02F1/133723C08G73/1046
Inventor 新津新平高桥真文望月大
Owner NISSAN CHEM IND LTD
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