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Liquid crystal alignment agent, liquid crystal alignment film, liquid crystal display element and manufacturing method thereof

A liquid crystal alignment agent and liquid crystal alignment technology, applied in liquid crystal materials, chemical instruments and methods, optics, etc., can solve the problems of inability to obtain uniform and good liquid crystal alignment film, uneven film development of alignment agent, poor solubility, etc., and achieve excellent Effects of display quality, improved coatability, and good pretilt angle stability

Active Publication Date: 2017-05-24
DAXIN MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Among them, due to the poor solubility of polyimide and polyamic acid in water, N-methylpyrrolidone (NMP) is usually used as a solvent. , due to the poor solubility of polyimide or polyamic acid itself or too much water in the alignment agent, the film will be uneven or even precipitated, and a uniform and good liquid crystal alignment film cannot be obtained

Method used

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  • Liquid crystal alignment agent, liquid crystal alignment film, liquid crystal display element and manufacturing method thereof
  • Liquid crystal alignment agent, liquid crystal alignment film, liquid crystal display element and manufacturing method thereof
  • Liquid crystal alignment agent, liquid crystal alignment film, liquid crystal display element and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1 and

[0078] Synthesis Example 1 and Synthesis Example 2

[0079] Add diamine and tetracarboxylic dianhydride to N-methyl-2-pyrrolidone in sequence (its chemical structure and weight are shown in Table 1 and Table 3) to prepare a solution with a solid content of 20% by weight, and in React at 40°C to 60°C for 4 hours to 6 hours to obtain a polyamic acid polymer, and then purify it with a solvent (such as methanol or water) with poor solubility for the polyamic acid polymer, and by reducing Drying under pressure gave Polymer A1 and Polymer A2.

Synthetic example 3 and

[0080] Synthesis Example 3 and Synthesis Example 4

[0081] Add diamine and tetracarboxylic dianhydride to N-isopropyl-2-pyrrolidone in sequence (its chemical structure and weight are shown in Table 1 and Table 3) to prepare a solution with a solid content of 20% by weight, and React at 40°C to 60°C for 4 hours to 6 hours to obtain a polyamic acid polymer, and then purify it with a solvent (such as methanol or water) that has poor solubility for the polyamic acid polymer, and by reducing Drying under pressure gave Polymer A3 and Polymer A4.

Synthetic example 5

[0083] Sequentially add diamine and tetracarboxylic dianhydride to N-methyl-2-pyrrolidone (as shown in Table 3) to prepare a solution with a solid content of 20% by weight, and store at 40°C to 60°C React for 4 hours to 6 hours to obtain a polyamic acid polymer, then add pyridine and acetic anhydride to the obtained polyamic acid polymer (the amount depends on the polyimidization ratio), at 100°C to 110°C The dehydration / ring-closing reaction was carried out at C for 3 hours to 4 hours, and the resulting solution was precipitated with methanol, purified with methanol, and finally collected and dried under reduced pressure to obtain polymer B1.

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Abstract

The invention provides a liquid crystal alignment agent, a liquid crystal alignment film, a liquid crystal display element and a manufacturing method thereof. The liquid crystal alignment agent includes: a solvent, the solvent includes pyrrolidone formula 1 represented by formula 1, wherein R is a C3-C12 branched hydrocarbon group.

Description

technical field [0001] The present invention relates to a liquid crystal alignment agent, in particular to a liquid crystal alignment agent containing pyrrolidone (pyrrolidone) in a solvent, a liquid crystal alignment film made by using the liquid crystal alignment agent, and a liquid crystal display element including the liquid crystal alignment film and its Manufacturing method. Background technique [0002] Liquid crystal display (liquid crystal display) is a display that utilizes the optoelectronic properties of liquid crystals. It has attractive advantages such as small size, light weight, low power consumption, and good display quality. It has become the mainstream of flat-panel displays in recent years. [0003] With the expansion of screen size, the requirements for high color saturation, high contrast and high response speed, liquid crystal displays have developed from Twisted Nematic (TN) to Super Twisted Nematic (STN), It is further developed to a TFT display ele...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D207/267C09K19/56G02F1/1337G02F1/1333
CPCC07D207/267C09K19/56G02F1/133711G02F1/133325C08K5/3415
Inventor 魏竹君林冠铭张立心李柏毅赖铭智
Owner DAXIN MATERIALS
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