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Liquid crystal orientating agent and liquid crystal display element

A liquid crystal display element, liquid crystal orientation technology, applied in the direction of liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problems of uneven orientation, moisture absorption, etc., and achieve the effect of excellent voltage retention rate

Active Publication Date: 2006-01-11
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially for low-voltage drive type liquid crystal display elements for the purpose of low power consumption, the requirements for voltage retention and reliability tests for long-term voltage at high temperatures are becoming more and more stringent. In addition, there are still manufacturing processes The problem of uneven orientation due to the absorption of moisture in the air by the oriented film, this problem needs to be solved urgently
However, as a liquid crystal alignment film suitable for the MVA method and the PVA method so far, for example, in Patent Document 1 and Patent Document 2, there are epoxy groups in the alignment agent structure, which can show excellent vertical alignment and electrical properties, but there is no solution. moisture problem

Method used

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  • Liquid crystal orientating agent and liquid crystal display element
  • Liquid crystal orientating agent and liquid crystal display element
  • Liquid crystal orientating agent and liquid crystal display element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0082] Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited by these examples. The evaluation items and evaluation methods of the liquid crystal aligning agents prepared in the following Examples and Comparative Examples are as follows.

[0083] (Vertical Orientation of Liquid Crystal Molecules)

[0084] Regarding the vertical alignment of the vertical alignment type liquid crystal display element, the liquid crystal display element was observed at the voltage OFF and at AC 12V (peak-to-peak), and it was judged as "good" when there was no abnormal magnetic region.

[0085] (Moisture resistance test of liquid crystal display element)

[0086] The moisture resistance of the vertical alignment type liquid crystal display element was placed in a room temperature, high humidity environment (90% RH), and the case where no abnormal magnetic domain occurred in the liquid crystal cell when the voltage was turn...

Synthetic example 1

[0092] 2.3g of 2,3,5-tricarboxycyclopentaneacetic dianhydride, 0.88g of p-phenylenediamine and 1.1g of the diamine compound represented by the above formula (9) were dissolved in 16.8g of N-methyl-2 -In pyrrolidone, react at 60°C for 5 hours. The reaction mixture was then injected with a large excess of methanol and the reaction product was allowed to precipitate. It was then washed with methanol and dried under reduced pressure at 40°C for 15 hours to obtain 55.6 g of the specific polymer Ia.

[0093] The specific polymer Ia obtained in Synthesis Example 1 was dissolved in 39.0 g of N-methyl-2-pyrrolidone, 0.88 g of pyridine and 1.13 g of acetic anhydride were added, and imidization was performed at 110° C. for 4 hours. Then, the reaction product liquid was precipitated in the same manner as in Synthesis Example 1 to obtain 53.0 g of the specific polymer IIa having an intrinsic viscosity of 0.63 dL / g. Table 1 shows the imidization ratio of the obtained specific polymer IIa....

Synthetic example 2

[0095] In addition to dissolving 1.89 g of 2,3,5-tricarboxycyclopentaneacetic dianhydride, 0.55 g of p-phenylenediamine and 1.76 g of the diamine compound represented by the above formula (9) in 16.8 g of N-methyl In the same manner as in Synthesis Example 1, except for -2-pyrrolidone, 55.7 g of the specific polymer Ia was obtained.

[0096] The specific polymer Ib obtained in Synthesis Example 2 was dissolved in 39.0 g of N-methyl-2-pyrrolidone, 0.73 g of pyridine and 0.95 of acetic anhydride were added, and imidization was performed at 110° C. for 4 hours. Then, the reaction product liquid was precipitated in the same manner as in Synthesis Example 1 to obtain 52.1 g of specific polymer IIb having an intrinsic viscosity of 0.5 dL / g.

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Abstract

The present invention provides a vertical alignment liquid crystal display element which is excellent in vertical alignment and voltage holding ratio properties, which does not bring about contrast unevenness and a display defect even left standing in highly humid surroundings and which is reliable, and a liquid crystal aligning agent therefor. The vertical alignment liquid crystal aligning agent contains 100 weight parts of a polyamic acid obtained by making a tetracarboxylic acid dianhydride react with a diamine compound and / or an imide polymer thereof, and 0.01-100 weight parts of a compound containing two or more epoxy groups in the molecule.

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent and a liquid crystal display element. More specifically, it relates to a liquid crystal aligning agent capable of realizing a liquid crystal aligning film excellent in vertical alignment, voltage retention, and moisture resistance, and a highly reliable liquid crystal display element having the above-mentioned liquid crystal aligning film. Background technique [0002] Conventionally, as a liquid crystal display element, it is known to form a liquid crystal alignment film composed of polyamic acid, polyimide, etc. on the surface of a substrate provided with a transparent conductive film, and as a substrate for a liquid crystal display element, 2 The sheets are arranged opposite to each other, and a layer of nematic liquid crystal with positive dielectric anisotropy is formed in the gap to form a liquid crystal cell with a sandwich structure. The long axis of the liquid crystal molecules i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/38G02F1/1337
CPCC08G73/10C08L79/08C09K19/38C09K19/56G02F1/133723
Inventor 木村礼子六鹿泰显
Owner JSR CORPORATIOON
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