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

A liquid crystal aligning agent and specific technology, applied in the directions of instruments, optics, nonlinear optics, etc., can solve the problems of high volume resistivity of liquid crystal alignment film, time-consuming removal of afterimages, and difficulty in decaying the accumulated charge, and achieve the characteristics of charge accumulation. Excellent, excellent voltage holding characteristics, small effect of volume resistivity change

Active Publication Date: 2014-05-14
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] On the other hand, if the volume resistivity of the liquid crystal aligning film is high, there are problems such as that the accumulated charge is difficult to decay, and it takes time to erase the afterimage.

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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Embodiment

[0160] Hereinafter, the present invention will be described in more detail with examples given, but the present invention is not limited thereto. The abbreviations used in the following Examples and Comparative Examples are as follows.

[0161] DA-1: 4,4'-Diaminodiphenylamine

[0162] DA-2: 4,4'-Diaminodiphenylmethane

[0163] DA-3: 1,5-bis(4-aminophenoxy)pentane

[0164] CA-1: 1,2,3,4-cyclobutanetetracarboxylic dianhydride

[0165] CA-2: Bicyclo[3,3,0]octane-2,4,6,8-tetracarboxylic dianhydride

[0166] CA-3: pyromellitic dianhydride

[0167] CA-4: 3,4-dicarboxy-1,2,3,4-tetrahydro-1-naphthalene succinic dianhydride

Synthetic example 1

[0169] Add 7.97g (40.0mmol) of DA-1 and 1.98g (10.0mmol) of DA-2 in a 200ml four-necked flask with a stirring device and a nitrogen inlet tube, and then add 72.34g of N-methyl-2-pyrrolidone , stirring to dissolve while sending nitrogen gas. 6.86 g (35.0 mmol) of CA-1 was added, stirring this diamine solution, and it stirred at water temperature for 30 minutes. Then, 3.13 g (12.5 mmol) of CA-2 was added while stirring the solution, N-methyl-2-pyrrolidone was added so that the solid content concentration became 20% by mass, and the mixture was stirred at 50° C. in an oil bath under a nitrogen atmosphere. 3 hours. Next, N-methyl-2-pyrrolidone was added so that the solid content concentration might become 11 mass %, and it stirred overnight at 50 degreeC with the oil bath under nitrogen atmosphere, and obtained the solution of the polyamic acid. The viscosity at 25°C of the polyamic acid solution was confirmed to be 191 mPa·s with an E-type viscometer (manufactured by Toki Sangy...

Synthetic example 2

[0172] Add 7.49g (37.6mmol) of DA-1 and 1.86g (9.4mmol) of DA-2 in a 300ml four-necked flask with a stirring device and a nitrogen inlet tube, and then add 72.08g of N-methyl-2-pyrrolidone , stirring to dissolve while sending nitrogen gas. 2.12 g (10.8 mmol) of CA-1 was added, stirring this diamine solution, and it stirred at water temperature for 30 minutes. Then, 8.82 g (35.3 mmol) of CA-2 was added while stirring the solution, N-methyl-2-pyrrolidone was added so that the solid content concentration became 20% by mass, and the mixture was stirred at 50° C. in an oil bath under a nitrogen atmosphere. 3 hours. Next, N-methyl-2-pyrrolidone was added so that the solid content concentration might become 11 mass %, and it stirred overnight at 50 degreeC with the oil bath under nitrogen atmosphere, and obtained the solution of the polyamic acid. The viscosity at 25° C. of the polyamic acid solution was confirmed to be 207 mPa·s with an E-type viscometer (manufactured by Toki Sang...

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Abstract

A liquid crystal aligning agent which contains a specific polymer (A) and a specific polymer (B) described below. Specific polymer (A): a polyamic acid which is obtained by reacting a tetracarboxylic acid dianhydride component that contains bicyclo[3,3,0]octane-2,4,6,8-tetracarboxylic acid dianhydride with a diamine component that contains at least one diamine compound as typified by 4,4'-diaminodiphenyl amine and 3,6-diaminocarbazole. Specific polymer (B): a polyimide precursor which has a structural unit represented by formula (7). (In formula (7), R represents a hydrogen atom or an alkyl group; Y represents a tetravalent organic group; and X represents a divalent organic group, with 10-100% by mole of X being a divalent organic group having one of the moieties represented by formulae (8)-(10) in the structure or a paraphenylene group.) (In formula (8), m1 represents an integer of 2-18.) (In formula (9), one or more arbitrary hydrogen atoms on the benzene rings may be substituted by monovalent organic groups other than primary amino groups; and m2 represents an integer of 1-8.) (In formula (10), one or more arbitrary hydrogen atoms on the benzene rings may be substituted by monovalent organic groups other than primary amino groups; and m3 represents an integer of 1-4.)

Description

technical field [0001] This invention relates to the liquid crystal aligning agent used when forming a liquid crystal aligning film, a liquid crystal aligning film, and the liquid crystal display element using the same. Background technique [0002] Currently, liquid crystal display elements are widely used as display devices. The liquid crystal aligning film which is a constituent member of a liquid crystal display element is a film which aligns a liquid crystal uniformly, and when liquid crystal orientation is insufficient, display failure called display unevenness and an afterimage tends to occur. Occurrence of display defects may be related to ionic impurities in liquid crystals, and as a method of reducing such impurities, a proposal such as Patent Document 1 has been proposed. [0003] Moreover, in a liquid crystal aligning film, the orientation process called rubbing which wipes off the surface of a polymer film with a cloth is performed normally. However, if the ru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337C08G73/10C08L79/08
CPCC08G73/0273C08G73/0672C08G73/1075C08G73/1078C08G73/1085G02F1/133723
Inventor 新津新平小野豪
Owner NISSAN CHEM IND LTD
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