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Liquid crystal alignment agent, liquid crystal alignment film, preparation method of liquid crystal alignment film and liquid crystal display element

A technology of liquid crystal alignment agent and liquid crystal alignment film, applied in liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problems of narrow exposure process window, adverse effects of non-exposed areas, and influence on display effect, so as to improve display effect and service life, excellent UV resistance, and the effect of increasing the working window

Inactive Publication Date: 2017-01-11
VALIANT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of implementing this technology, deep ultraviolet light is generally used to irradiate, and general polyimide, as an organic substance, will be damaged by deep ultraviolet light. If the exposure is not well controlled, it will lead to damage The non-exposed area has adverse effects and affects the display effect, so the exposure process window of the current photo-alignment technology is narrow

Method used

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  • Liquid crystal alignment agent, liquid crystal alignment film, preparation method of liquid crystal alignment film and liquid crystal display element
  • Liquid crystal alignment agent, liquid crystal alignment film, preparation method of liquid crystal alignment film and liquid crystal display element
  • Liquid crystal alignment agent, liquid crystal alignment film, preparation method of liquid crystal alignment film and liquid crystal display element

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0082] The compound represented by structural formula (I-1) can be synthesized according to the following synthetic route 1:

[0083]

[0084] (1) Synthesis of compound b-1-1a

[0085] Put 2,4-dinitrophenol (110.5g, 600mmol), anhydrous potassium carbonate (82.9g, 600mmol) and 400g N,N-dimethylformamide into a 1000mL three-necked round bottom flask, The resulting red suspension was stirred at room temperature for 10 minutes, and then the solution was heated to 60°C. Under stirring, it will contain 2,6-di-tert-butyl-4-bromophenol (171.1g, 600mmol) and 300g N , The solution of N-dimethylformamide dripped into the system, and the system exothermed. After all the solutions are added, keep stirring at 60-65°C for 2 hours. After the reaction was detected by gas chromatography (GC), the stirring was stopped and then suction filtered. The resulting black filtrate was acidified with dilute hydrochloric acid to acidity, and then 3L of water was added. The system precipitated solids. The re...

Synthetic example 2

[0090] The compound represented by structural formula (I-2) can be synthesized according to the following synthetic route 2:

[0091]

[0092] (1) Synthesis of compound b-1-2a

[0093] Put 2,6-di-tert-butyl hydroquinone (44.4 g, 200 mmol), triethylamine (20.2 g, 200 mmol) and 400 g tetrahydrofuran into a 1000 mL three-necked round bottom flask, and the resulting suspension is in After stirring for 10 minutes at room temperature, a colorless solution was obtained. Then the temperature of the solution was lowered to 0°C. Under stirring, the solution containing 3,5-dinitrobenzoyl chloride (46.1g, 200mmol) and 100g tetrahydrofuran When dropped into the system, the system emits heat, and the dropping rate is controlled to keep the internal temperature below 20°C. After all the solutions are added, keep stirring at 15-20°C for 2 hours. After the reaction is detected by gas chromatography (GC), the stirring is stopped and then suction filtered. Under stirring, the filtrate is poured int...

Synthetic example 3

[0098] The compound represented by structural formula (I-3) can be synthesized according to the following synthetic route 3:

[0099]

[0100] (1) Synthesis of compound b-1-3a

[0101] In a nitrogen atmosphere, put 2,5-di-tert-butyl hydroquinone (133.4g, 600mmol), anhydrous potassium carbonate (82.9g, 600mmol) and 400g N in a 1000mL three-necked round bottom flask. , N-dimethylformamide, the resulting red suspension was stirred at room temperature for 10 minutes, then the solution was heated to 60 ℃, stirring, will contain 2,4-dinitrochlorobenzene (121.5g, 600 milli Mol) and 300g of N,N-dimethylformamide solution were dropped into the system, and the system exothermed. After all the solutions are added, keep stirring at 60-65°C for 2 hours. After the reaction is detected by gas chromatography (GC), the stirring is stopped, and then the inorganic salt and by-products are removed by suction filtration. The obtained black filtrate was acidified with dilute hydrochloric acid to acid...

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Abstract

The invention discloses a liquid crystal alignment agent, a liquid crystal alignment film, a preparation method of the liquid crystal alignment film and a liquid crystal display element, and belongs to the technical field of liquid crystal display. The liquid crystal alignment agent is prepared from a polymer A obtained through a reaction of a mixture, and a solvent B, wherein the mixture contains a tetracarboxylic acid dianhydride component a and a diamine component b, and the diamine component b at least comprises a diamine compound b-1 shown in the formula I. The invention further provides the liquid crystal alignment film prepared from the liquid crystal alignment agent, the preparation method of the liquid crystal alignment agent and the liquid crystal display element. The liquid crystal alignment agent is formed by polymerizing diamine monomers containing tert-butylphenol fragments and other tetracarboxylic acid dianhydride monomers. When applied to a photo-alignment exposure process, the liquid crystal alignment film can enlarge a working window and has the dual advantages that exposure in an exposure zone is thorough and a non-exposure zone has excellent ultraviolet resistance; thus, the display effect of a liquid crystal displayer can be improved, and the service life of the liquid crystal displayer can be prolonged.

Description

Technical field [0001] The invention relates to a liquid crystal alignment agent, a liquid crystal alignment film, a preparation method thereof, and a liquid crystal display element, belonging to the technical field of liquid crystal display. Background technique [0002] Liquid crystal display relies on controlling the arrangement state of liquid crystal molecules to achieve display. Generally, a liquid crystal alignment film is provided in a liquid crystal display element to control the initial arrangement state of liquid crystal molecules. As a liquid crystal alignment film, polyimide materials with outstanding properties such as high temperature resistance are mainly used. At present, the most popular orientation method in the industry is to use cotton, nylon, polyester and other fibers to woven fabrics and rub in one direction. orientation. However, the rubbing orientation is easy to produce dust and debris, and it is easy to cause scars on the liquid crystal alignment film...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/56G02F1/1337C08G73/10
CPCC08G73/10C09K19/56G02F1/1337C08G73/1007C08G73/1042C08G73/105C08G73/1071C08G73/1078G02F1/133723G02F1/133788
Inventor 周雨生胡葆华王治国解万龙安隆隆苏俊伟
Owner VALIANT CO LTD
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