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

A liquid crystal alignment agent and general formula technology, applied in liquid crystal materials, instruments, optics, etc., can solve the problems of improving voltage retention, thermal reliability, contrast decrease, power consumption increase, etc.

Inactive Publication Date: 2010-06-16
JNC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the high voltage retention rate cannot be maintained for a long time, there will be problems such as voltage drop, drive voltage increase, power consumption increase, and contrast drop.
In the above-mentioned Patent Document 1, although the voltage retention rate of the initial value is improved, no study has been made on improving the long-term thermal reliability of the voltage retention rate.
In addition, in the above-mentioned Patent Documents 2 and 3, there is no study on improving the long-term thermal reliability of the voltage retention rate.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0462] Hereinafter, the present invention will be explained using examples, but the present invention is not limited to these examples. The compounds used in the examples are as follows.

[0463]

[0464] EDDA: ethylenediaminetetraacetic acid dianhydride

[0465] PhDDA: 1,4-Phenylenediaminetetraacetic acid dianhydride

[0466] PMDA: Pyromellitic Dianhydride (Pyromellitic Dianhydride)

[0467] CBDA: cyclobutane tetracarboxylic dianhydride (cyclobutane tetracarboxylic dianhydride)

[0468] PSQ1: 18,21-bis(3-(2,5-dioxotetrahydrofuran-3-yl)propyl)-18,21-dimethyl-1,3,5,7,9,11,13,15 -Octylphenyl-pentacyclic [10.5.1.25, 13.17, 11.19, 15] decasiloxane

[0469] NPDA: Naphthalene-1,4,5,8-tetracarboxylic dianhydride

[0470] NTCA: Naphthalene-2,3,6,7-tetracarboxylic dianhydride

[0471]

[0472] DDM: 4,4'-Diaminodiphenylmethane

[0473] DDET: 4,4'-Diaminodiphenylethane

[0474] DATA: 1,3,5-diamino-1,2,4-triazole

[0475] 5HHP1PDA: 5-{4-[4-(4-n-pentylcyclohexyl)]cyclohexyl}phenylmethyl-1,3-diaminobenze...

Synthetic example 1

[0486] A 100 mL four-necked flask equipped with a thermometer, a stirrer, a raw material input port, and a nitrogen introduction port was charged with 0.7420 g of 5HHP1PDA, 0.7934 g of DDM, and 37.0 g of dehydrated NMP, and stirred and dissolved under a stream of dry nitrogen. Next, 1.4646 g of EDDA was added, and after reacting for 30 hours, 10.0 g of BC was added to synthesize a polyamic acid solution (PA1) with a concentration of 6 wt%. When the temperature rises due to the reaction temperature during the reaction of the raw materials, the reaction temperature is suppressed to about 70°C or less and the reaction proceeds. In addition, the weight average molecular weight of the polyamic acid in the obtained PA1 was 72,600.

[0487] The weight average molecular weight of the polyamic acid is calculated as follows: the concentration of the polyamic acid is about 1% by weight, and the mixture is diluted with a phosphoric acid-DMF mixed solution (phosphoric acid / DMF=0.6 / 100, weight...

Embodiment 1

[0518] A mixed solvent of NMP / BC=1 / 1 (weight ratio) was added to the 6 wt% polyamic acid solution (PA1) synthesized in Synthesis Example 1, and the whole was diluted to 4 wt% to prepare liquid crystal Alignment agent. Using the obtained liquid crystal alignment agent, a liquid crystal display element was produced in the following manner.

[0519]

[0520] The obtained liquid crystal alignment agent was coated on a pair of substrates with ITO transparent electrodes by a spin coating method, and dried on a hot plate at 80° C. for 5 minutes. Then, it was heated and calcined in an oven set at 220° C. for 20 minutes to obtain a substrate on which a liquid crystal alignment film was formed. Make the surface on which the liquid crystal alignment film is formed as the inside, leave the injection hole of the liquid crystal on one of the substrates, seal the periphery with an epoxy-based adhesive, and spread and paste a 4.25μm gap material on the other substrate. . The liquid crystal co...

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Abstract

The present invention provides a liquid crystal display element which can represent required VHR long-term thermal reliability, a liquid crystal alignment film which can represent required VHR long-term thermal reliability in the liquid crystal display element, and a liquid crystal alignment agent which can form the liquid crystal alignment film. The liquid crystal alignment film is formed by the liquid crystal alignment agent which comprises polyamide acids or derivative, which takes ethylenediaminetetraacetic Dianhydride and aromatic diamine with side chain. Furthermore the liquid crystal alignment film is used for the liquid crystal display element.

Description

Technical field [0001] The present invention relates to a liquid crystal alignment agent containing polyamic acid obtained by reacting diamine and tetracarboxylic dianhydride or a derivative thereof, and a liquid crystal obtained from the liquid crystal alignment agent An alignment film and a liquid crystal display element having the liquid crystal alignment film, in particular to a liquid crystal alignment agent suitable for vertical alignment (Vertical Alignment, VA), a liquid crystal alignment film obtained from the liquid crystal alignment agent, and a liquid crystal alignment film having the liquid crystal alignment Film liquid crystal display element. Background technique [0002] The liquid crystal display element is used in the viewfinder of the video camera (viewfinder), the projection type display (display), etc. represented by the monitor of a notebook computer or a desktop personal computer (monitor) Various liquid crystal display devices have also recently been used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/56G02F1/1337
CPCC08G73/106C08G73/1075C08L79/08C09K19/56G02F1/133723
Inventor 片野裕子近藤史尚藤原武
Owner JNC CORP
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