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

A liquid crystal alignment agent and a technology of liquid crystal alignment, applied in liquid crystal materials, optics, instruments, etc., can solve problems such as inapplicability, reduced alignment ability of liquid crystal alignment film, poor uniformity of liquid crystal molecule tilt angle, etc., and achieve the best process stability , the effect of good reliability

Inactive Publication Date: 2013-10-30
CHI MEI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the above patent is to improve the problem of poor film thickness uniformity of the liquid crystal alignment film
However, when the polyimide polymer of this patent is subjected to alignment treatment, it is easily affected by the conditions of the alignment process, which reduces the alignment ability of the liquid crystal alignment film formed by it, which in turn leads to poor uniformity of the tilt angle of the liquid crystal molecules. However, there is a problem of process stability, and when the liquid crystal alignment film is applied to liquid crystal display elements, there is a problem of poor reliability after the liquid crystal display element is tested under high temperature and high humidity. At the same time, the liquid crystal alignment film of this patent is not applicable On vertical alignment liquid crystal display elements that require a large tilt angle

Method used

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

Examples

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preparation example Construction

[0150] The preparation method of the polyimide polymer comprises dissolving the mixture comprising the tetracarboxylic dianhydride component, the polyamine component shown in formula (I) and the diamine component in a solvent, and performing a polymerization reaction to form a polyamide acid polymer, and in the presence of a dehydrating agent and a catalyst, further heating and dehydration ring-closing reaction, so that the amic acid functional group in the polyamic acid polymer is converted into an imide functional group (ie imide) through a dehydration ring-closure reaction. amination) to obtain a polyimide polymer.

[0151] Prepare the tetracarboxylic dianhydride component used in the polyimide polymer, the polyamine component and the diamine component shown in formula (I) and the tetracarboxylic acid used in the above-mentioned preparation polyamic acid polymer The dianhydride component and the polyamine component represented by the formula (I) are the same as the diamine ...

Synthetic example 1

[0189] A nitrogen inlet, a stirrer, a condenser tube and a thermometer are arranged on a four-necked conical flask with a capacity of 500 milliliters, and nitrogen is introduced, and the feed composition is added to include: 5.37 grams (0.01 mole) of the diamine compound of formula (1), 40.55 gram (0.0375 mol) of p-phenylenediamine, 0.31 gram (0.0025 mol) of 1,2,4-triaminobenzene and 80 gram of nitrogen-methyl-2-pyrrolidone were stirred at room temperature until dissolved. Then add 10.91 grams (0.05 moles) of pyromellitic dianhydride and 20 grams of nitrogen-methyl-2-pyrrolidone, and react at room temperature for 2 hours. After the reaction, the reaction solution is poured into 1500 milliliters of water to polymerize After the polymer was filtered, washed with methanol and filtered three times, it was placed in a vacuum oven and dried at a temperature of 60° C. to obtain the polyamic acid polymer (A-1-1).

Synthetic example 2～5

[0191] Synthesis example 2~5 is to prepare this polyamic acid polymer with the step identical with synthesis example 1, difference is: change the diamine compound shown in tetracarboxylic dianhydride component, formula (II), formula ( I) the polyamine component shown, or the kind and usage amount of other diamine compounds, as shown in Table 1.

[0192] [Preparation of polyimide polymer]

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Abstract

A liquid crystal alignment agent including a polymer composition and a solvent. The polymer composition is obtained by subjecting a mixture including a tetracarboxylic dianhydride component, a multi-amine component of formula (I) defined herein, and a diamine component to a reaction. The diamine component includes a diamine compound of formula (II) defined herein.

Description

technical field [0001] The invention relates to a liquid crystal alignment agent for a vertical alignment liquid crystal display element, in particular to a liquid crystal alignment agent comprising polyamic acid or polyimide and a solvent. Background technique [0002] As consumers' requirements for the wide viewing angle characteristics of liquid crystal displays are increasing year by year, the requirements for the electrical characteristics or display characteristics of liquid crystal display elements with wide viewing angles are more stringent than ever before, and the vertical alignment type (Vertical Alignment) liquid crystal display element most widely studied. In order to have better above-mentioned characteristics, the liquid crystal alignment film becomes an important research object for improving the characteristics of the vertical alignment type liquid crystal display device. [0003] The liquid crystal alignment film in the vertical alignment type liquid cryst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/56G02F1/1337
CPCC09K19/56
Inventor 蔡宗沛薛怀斌
Owner CHI MEI CORP
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