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

A technology of liquid crystal display elements and liquid crystal alignment agents, which is applied in the direction of liquid crystal materials, instruments, chemical instruments and methods, etc., can solve the problems of unstable placement of liquid crystal alignment agents, and achieve excellent thermal stability, small changes in pretilt angle, and changes in viscosity big effect

Inactive Publication Date: 2020-09-11
JIANGSU SUNERA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The liquid crystal aligning agent of the present invention solves the problem of unstable placement of the liquid crystal aligning agent caused by the side chain aligning group, the liquid crystal aligning film prepared by the liquid crystal aligning agent of the present invention has excellent thermal stability, and the liquid crystal display element made has good weather resistance characteristics

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The compound (b-1-1) shown in formula I-1 can be synthesized according to the following synthetic route 1:

[0047]

[0048] Synthetic route 1

[0049] (1) Synthesis of compound b-1-1a

[0050] In a 1000mL three-neck round bottom flask, drop biphenol (37.2g, 200 mmol), 5CCMeO (53.2g, 200 mmol), PPh 3 (52.4g, 240 mmoles) and 500g THF were stirred at 25°C until they were fully dissolved, and DIAD (48.5g, 240 mmoles) was added dropwise for 0.5h, kept for 6 hours, desolvated to the remaining 210g, then cooled to -20°C, The solution was filtered, and the obtained solid was crystallized, filtered, and dried to obtain solid b-1-1a.

[0051] (2) Synthesis of compound b-1-1b

[0052] In a three-neck round bottom flask of 1000mL, drop 2,4-dinitrochlorobenzene (33.4g, 165 mmol), b-1-1a (65.2g, 150 mmol), potassium carbonate (27.6g, 200 mmol ) 500g of toluene, stirred and heated to reflux for 6 hours, then the temperature was lowered and the solution was filtered, the filtra...

Embodiment 2～4

[0057] Compounds shown in formula I-2 (b-1-2), formula I-3 (b-1-3), formula I-4 (b-1-4) can be synthesized according to synthetic route 1 corresponding parent compound The phenol compound is then etherified with 2,4'-dinitrochlorobenzene to obtain the corresponding nitro compound; the nitro compounds of the structural formulas I-2 to I-4 are obtained, and then the nitro group is reduced by catalytic hydrogenation, The corresponding diamino compounds are obtained, and the high-resolution mass spectrometry data and elemental analysis results of the compounds represented by formulas I-2 to I-4 are shown in Table 1 below:

[0058] Table 1

[0059]

Embodiment 5

[0061] The compound shown in formula I-5 (b-1-5) can be synthesized according to the following synthetic route 2:

[0062]

[0063] Synthetic route 2

[0064] (1) Synthesis of compound (b-1-5a)

[0065] In a 1000mL three-necked round-bottomed flask, pentylcyclohexylphenol (49.2g, 200mmol), 4-hydroxybiphenylmethanol (40.1g, 200mmol), PPh 3 (52.4g, 240 mmoles) and 500g THF were stirred at 25°C until they were fully dissolved, and DIAD (48.5g, 240 mmoles) was added dropwise for 0.5h, kept for 6 hours, desolvated to the remaining 210g, then cooled to -20°C, The solution was filtered, and the obtained solid was crystallized, filtered, and dried to obtain solid b-1-5a.

[0066] (2) Synthesis of compound (b-1-5b)

[0067] Put b-1-5a (65.2g, 150mmol), potassium carbonate (27.6g, 200mmol) and 500g toluene into a 1000mL three-necked round-bottomed flask and stir to raise the temperature to 80°C. Slowly add 2 to the system, The mixed solution of 4-dinitrochlorobenzene (38.0g, 165 ...

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Abstract

The invention discloses a liquid crystal aligning agent, a liquid crystal alignment film and a liquid crystal display element, and belongs to the technical field of liquid crystal display. The liquidcrystal aligning agent comprises a polymer A and a solvent B, wherein the polymer A is obtained by reacting a tetracarboxylic dianhydride component a with a diamine component b, and the diamine component b comprises a diamine compound b-1 represented by a general formula (1). The invention further discloses a liquid crystal alignment film and a liquid crystal display element which are prepared from the liquid crystal alignment agent. The liquid crystal aligning agent is stable in placement at room temperature, a prepared liquid crystal alignment film has excellent thermal stability, and a prepared liquid crystal display element is good in weather resistance, so that a high-quality liquid crystal display device is prepared.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to a liquid crystal aligning agent, a liquid crystal aligning film and a liquid crystal display element. Background technique [0002] Liquid crystal elements are widely used in televisions, mobile devices, various monitors, and the like. Liquid crystal display is realized by controlling the alignment state of liquid crystal molecules. Usually, a liquid crystal alignment film is set in the liquid crystal display element to control the initial alignment state of liquid crystal molecules. As a liquid crystal alignment film, polyimide materials with outstanding properties such as high temperature resistance are mainly used. [0003] Polyimide or its precursor is dissolved in an organic solvent to make a liquid crystal aligning agent. At room temperature, the liquid crystal aligning agent will cause gel or viscosity changes due to the solubility of polyimide or the mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/56G02F1/1337C08G73/10C08J5/18C08L79/08
CPCC09K19/56G02F1/133723G02F1/133711C08G73/1078C08G73/1042C08G73/105C08G73/1071C08G73/1007C08J5/18C08J2379/08
Inventor 王治国王明佼吕公鑫李士东胡葆华周银波
Owner JIANGSU SUNERA TECH CO LTD
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