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

A technology of liquid crystal aligning agent and organic solvent, which is applied in the direction of liquid crystal materials, optics, instruments, etc., can solve the problems of liquid crystal display element characteristics degradation, peeling off, and yield decline, and achieve a small reduction in voltage retention rate, less film scrapping, The effect of high reliability

Active Publication Date: 2012-01-11
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the rubbing process, a part of the coating film may be peeled off, and the surface of the liquid crystal alignment film may be scratched due to the rubbing process, that is, the problem of so-called "film chipping".
These abnormalities are one of the causes of deterioration in the characteristics of liquid crystal display elements, which in turn leads to a decrease in yield

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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Effect test

Embodiment

[0133] Examples (synthesis examples) and comparative examples are described below to describe the present invention in more detail, but the present invention should not be construed as being limited thereto.

Synthetic example 1～14

[0134]

[0135] Abbreviations used in these Examples (Synthesis Examples) and Comparative Examples are as follows. In addition, the measurement of the molecular weight of a polyimide, and the measurement of an imidization ratio were performed by the following method.

[0136]

[0137] A-1: 4-dicarboxylic acid-1,2,3,4-tetrahydro-1-naphthalene succinic dianhydride

[0138] A-2: 1,2,3,4-cyclobutanetetracarboxylic dianhydride

[0139] A-3: Pyromellitic dianhydride

[0140] A-4: Bicyclo[3,3,0]octane-2,4,6,8-tetracarboxylic dianhydride

[0141] A-5: 2,3,5-tricarboxycyclopentylacetic acid-1,4:2,3-dianhydride

[0142]

[0143]

[0144] B-2: 1,3-diamino-4-octadecyloxybenzene

[0145] B-4: p-Phenylenediamine

[0146] B-5: 4-{4-(4-pentylcyclohexyl)phenoxy}-1,3-diaminobenzene

[0147] B-8: 4,4'-Diaminodiphenylmethane

[0148] B-13: 3,5-Diaminobenzoic acid

[0149] B-14: m-phenylenediamine

[0150] B-15: a diamine compound represented by the following formula B-15

[015...

Synthetic example 1

[0174] Mix A-4 (13.5g, 54mmol), B-4 (5.4g, 50mmol) and B-5 (8.2g, 22mmol) in NMP (80.1g), after reacting at 40°C for 3 hours, add A-2 (3.3g, 17mmol) and NMP (41.8g) were reacted at 40° C. for 3 hours to obtain a polyamic acid solution. After adding NMP to this polyamic-acid solution (104.2g) and diluting to 6 mass %, acetic anhydride (12.5g) and pyridine (9.7g) were added as an imidation catalyst, and it was made to react at 80 degreeC for 3 hours. This reaction solution was poured into methanol (1300 ml), and the resulting precipitate was separated by filtration. This deposit was wash|cleaned with methanol, and it dried under reduced pressure at 100 degreeC, and obtained the polyimide powder (A). The imidization rate of this polyimide was 55%, the number average molecular weight was 19100, and the weight average molecular weight was 54300.

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Abstract

Disclosed is a liquid crystal aligning agent which can provide a liquid crystal alignment film that is insusceptible to film chipping during a rubbing processing and exhibits only a small reduction in a voltage holding ratio even after the liquid crystal alignment film is exposed to a back light for a long period. Specifically disclosed is a liquid crystal aligning agent characterized by comprising a component (A) and a component (B), wherein the component (A) is a compound having such a structure that a group represented by formula [i] is bound to an aromatic ring and the component (B) is at least one polymeric compound selected from a group consisting of a polyimide and a polyimide precursor. In formula [i], X represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms.

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 containing polyimide and / or a polyimide precursor. Background technique [0002] Liquid crystal display elements are currently widely used as thin and lightweight display devices. Usually, in this liquid crystal display element, a liquid crystal aligning film is used for determining the orientation state of a liquid crystal. Moreover, most of this liquid crystal aligning film is manufactured by subjecting the surface of the polymer film formed on the electrode board|substrate to some kind of orientation process except a part of vertical alignment type liquid crystal display element etc.. [0003] As a polymer used for a liquid crystal aligning film, polyimide, a polyamide, a polyamide imide, etc. are known, and the liquid crystal aligning agent which melt|dissolved these polymers or its precursor in a solvent is used n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337
CPCC09K19/56G02F1/133723
Inventor 后藤耕平片山雅章保坂和义松本欣也
Owner NISSAN CHEM IND LTD
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