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Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element formed from the liquid crystal alignment agent

A liquid crystal alignment agent and a technology of liquid crystal alignment, applied in liquid crystal materials, optics, instruments, etc., can solve the problem of high ion density, achieve low ion density and maintain the effect of ion density

Inactive Publication Date: 2018-02-06
CHI MEI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the liquid crystal alignment agent still has the problem of high ion density, especially after a period of ultraviolet light irradiation, which is not acceptable to the industry.

Method used

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  • Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element formed from the liquid crystal alignment agent
  • Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element formed from the liquid crystal alignment agent
  • Liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element formed from the liquid crystal alignment agent

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0193] The preparation method of the polyimide polymer comprises dissolving the mixture comprising the tetracarboxylic dianhydride component and the diamine component in a solvent, performing a polymerization reaction to form a polyamic acid polymer, and in the presence of a dehydrating agent and a catalyst Under further heating and dehydration ring-closing reaction, the amic acid functional group in the polyamic acid polymer is converted into an imide functional group through the dehydration ring-closure reaction (ie, imidization) to obtain a polyimide polymer.

[0194] The tetracarboxylic dianhydride component and the diamine component used in the preparation of the polyimide polymer are the same as the tetracarboxylic dianhydride component and the diamine component used in the above-mentioned preparation of the polyamic acid polymer. points are the same.

[0195] The solvent used in the dehydration ring-closing reaction may be the same as the solvent in the liquid crystal a...

Embodiment

[0277] [Preparation of polymer composition]

[0278] [Preparation of polyamic acid compound]

Synthetic example 1

[0280] 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 first diamine compound (4.44 grams, 0.0075 moles) of the formula (I-5) is added (b-1 -1), the second diamine compound of formula (II-5) (1.16 grams, 0.0025 moles) (b-2-1), p-phenylenediamine (4.32 grams, 0.04 moles) (b-3-1), and N-methyl-2-pyrrolidone (80 g), stirred at room temperature until dissolved. 2,3,5-Tricarboxycyclopentyl acetic acid dianhydride (11.2 g, 0.05 mol) (a-1) and N-methyl-2-pyrrolidone (20 g) were added and reacted at room temperature for 2 hours. After the reaction is over, pour the reaction solution into (1500 ml) water to precipitate the polymer, and then filter the obtained polymer to wash and filter with methanol three times, put it in a vacuum oven, and dry it at a temperature of 60°C to obtain the polymer composition Object (A-1-1).

[0281] Synthesis Examples 2 to...

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PUM

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Abstract

A liquid crystal alignment agent contains a polymer composition, a polysiloxane, and a solvent. The polymer composition is obtained by subjecting a mixture including a tetracarboxylic dianhydride component and a diamine component to a reaction. The diamine component includes first and second diamine compounds. The polysiloxane contains an epoxy-based group. A liquid crystal display element made from the aforesaid liquid crystal alignment agent has reduced ion density.

Description

technical field [0001] The invention relates to a liquid crystal alignment agent, in particular to a liquid crystal alignment agent for forming a liquid crystal alignment film with low ion density. The present invention also relates to a liquid crystal alignment film formed by the liquid crystal alignment agent, and a liquid crystal display element comprising the liquid crystal alignment film. Background technique [0002] In recent years, as the display quality requirements of liquid crystal displays have been increasing year by year, liquid crystal display elements need to be developed towards high performance, and then develop from TN, STN to IPS, VA, PSA and other types of liquid crystal displays. Based on different display principles, the liquid crystals in various liquid crystal displays require different pretilt angles. However, in order to have better display quality, the common requirement is good liquid crystal alignment. Therefore, the alignment of liquid crystal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/56G02F1/1337
CPCC09K19/56G02F1/133723
Inventor 邱信融黄菀婷蔡宗沛
Owner CHI MEI CORP
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