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Liquid crystal aligning agent, liquid crystal aligning film prepared by using same and liquid crystal display element prepared by using liquid crystal aligning agent

A liquid crystal alignment agent and liquid crystal alignment technology, applied in liquid crystal materials, optics, instruments, etc., can solve problems such as poor quality and yield, inability to effectively solve afterimages, poor stability of pretilt angle over time, etc., to achieve Effect of good storage stability

Inactive Publication Date: 2014-02-19
CHI MEI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the liquid crystal alignment film formed by using the existing liquid crystal alignment agent mainly made of polyamic acid or polyimide has good heat resistance, it has poor pretilt stability over time. The problem
[0005] In order to solve the problem of poor stability of the above-mentioned pretilt angle over time, Japanese Patent Application Publication No. 7-43725 and Japanese Patent Application Publication No. 7-110484 disclose a method using polyaspartimide (Polyaspartimide) as a liquid crystal. Alignment agent material technology, thereby improving the stability of the pretilt angle of the liquid crystal alignment film over time. However, the quality and yield of the product produced by the synthesis method used in the patent is not good, because in the manufacture In the obtained product, in addition to the expected polyaspartimide polymer, there are also too many unreacted substances, so that the liquid crystal alignment agent prepared from it as a raw material has the problem of poor storage stability , and the liquid crystal alignment film formed with the liquid crystal alignment agent is prone to image sticking
[0006] Since the existing liquid crystal alignment agents still cannot effectively solve the phenomenon of image sticking, or have the disadvantage of poor storage stability, there is still a need to develop a liquid crystal with good storage stability and effective elimination of image sticking alignment agent

Method used

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  • Liquid crystal aligning agent, liquid crystal aligning film prepared by using same and liquid crystal display element prepared by using liquid crystal aligning agent
  • Liquid crystal aligning agent, liquid crystal aligning film prepared by using same and liquid crystal display element prepared by using liquid crystal aligning agent
  • Liquid crystal aligning agent, liquid crystal aligning film prepared by using same and liquid crystal display element prepared by using liquid crystal aligning agent

Examples

Experimental program
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Effect test

Embodiment

[0094] The present invention will be further described with reference to the following examples, but it should be understood that the examples are for illustrative purposes only and should not be construed as limitations on the implementation of the present invention.

[0095] C7CDA used in the following examples was prepared according to the method disclosed in Japanese Patent Application Laid-Open No. 2003-96034, and B CDA was prepared according to the method disclosed in Japanese Patent Application Publication No. 2002-162630.

[0096] [Synthetic polymer (A)]

Synthetic example 1

[0098] Set nitrogen inlet, stirrer, heater, condenser and thermometer on a four-necked conical flask with a capacity of 500 ml, and introduce nitrogen, add the first batch of feed including: N, N'-4,4'-diphenyl Dimethyl methane bismaleimide (hereinafter referred to as DPM-BMI) 8.96g (0.025mole), and solvent N-methyl-2-pyrolidone (hereinafter referred to as NMP) 50g, at room temperature (23 ℃ -25 ℃ ) and stirred until dissolved. Then add the second batch of feed and include: p-phenylenediamine (hereinafter referred to as PDA) 2.57g (0.02375mole), compound (hereinafter referred to as C7CDA) 0.61g (0.00125mole) shown in structural formula (7), glacial acetic acid 5g , and NMP 27g, reacted at 100°C for 24 hours, after the reaction, the resulting reaction solution was poured into 1500ml of methanol to precipitate the polymer, and then filtered the resulting polymer and put it into a vacuum oven. After drying at a temperature of 60° C., the polymer (A-1-1) can be obtained.

Synthetic example 2

[0100] Set nitrogen inlet, stirrer, heater, condenser and thermometer on a four-necked conical flask with a volume of 500 ml, and introduce nitrogen, add the first batch of feed including: N, N'-m-phenylene dihydrogen 6.71 g (0.025 mole) of imide (hereinafter referred to as P-BMI) and 50 g of solvent NMP were stirred at room temperature until dissolved. Add the second batch of feed and include: 4,4'-diaminodiphenylmethane (hereinafter referred to as DDM) 3.97g (0.02mole), the compound (hereinafter referred to as BCDA) shown in structural formula (6) 2.26g (0.005 mole), 5 g of glacial acetic acid, and 27 g of NMP were reacted at 100° C. for 24 hours. After the reaction, the reaction solution obtained was poured into 1500 ml of methanol to precipitate the polymer, and the polymer obtained was filtered and placed put into a vacuum oven and dry at a temperature of 60°C to obtain the polymer (A-1-2).

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Abstract

The invention discloses a liquid crystal aligning agent, a liquid crystal aligning film prepared by using the same and a liquid crystal display element prepared by using the liquid crystal aligning agent. The liquid crystal aligning agent contains at least one of polymers (A) with a repeating unit shown as a constitutional formula (I), and at least one of organic solvents (B); and the measured viscosity of the liquid crystal aligning agent at the temperature of 25 DEG C is between 5 and 40cps. In the constitutional formula (I), P is a bivalent organic group; and Q is a bivalent organic group.

Description

technical field [0001] The invention relates to an alignment agent, in particular to a liquid crystal alignment agent, and a liquid crystal alignment film and a liquid crystal display element prepared therefrom. Background technique [0002] Liquid crystal display elements were mainly used in the screens of notebook computers or desktop personal computers in the early days, and were also used in various liquid crystal display devices such as camera viewfinders and projection displays. In recent years, they have also been widely used in the production of televisions. machine. The industry generally uses nematic liquid crystal display elements as the mainstream. Among the nematic liquid crystal display elements, the types that are actually used are as follows: (1) The alignment direction of the liquid crystal on one side of the substrate is different from that on the other side. Twisted Nematic (TN) type liquid crystal display elements in which the liquid crystal alignment di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/56G02F1/1337
Inventor 薛怀斌
Owner CHI MEI CORP
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