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Composition for liquid crystal alignment layer and liquid crystal alignment layer

A technology of liquid crystal alignment film and composition, which is applied in the direction of liquid crystal materials, instruments, chemical instruments and methods, etc., which can solve the problems of alignment itself shaking, poor stability, liquid crystal afterimage, etc., and achieve the effect of excellent characteristics

Active Publication Date: 2012-02-08
LG CHEM LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, when a known photo-alignment polymer or an alignment composition containing the polymer is applied to the alignment film in the TFT-cell, there are problems in the stability of the alignment film or the afterimage of the liquid crystal cell.
That is, when the conventional alignment polymers are applied, since the photo-alignment polymers in the alignment film are subjected to external stresses such as electrical stress and thermal stress, they will exhibit extremely poor stability, and the alignment itself will shake, resulting in liquid crystal afterimages. question

Method used

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  • Composition for liquid crystal alignment layer and liquid crystal alignment layer
  • Composition for liquid crystal alignment layer and liquid crystal alignment layer
  • Composition for liquid crystal alignment layer and liquid crystal alignment layer

Examples

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preparation example 1

[0121] Preparation Example 1: Synthesis of 4-fluorocinnamic acid (4-fluorocinnamic acid)

[0122] 4-fluorobenzaldehyde (4-fluorobenzaldehyde) (10g, 80.6mol), malonic acid (malonic acid) (29.5g, 2 equivalents), piperidine (1.21g, 0.1 equivalents) were put into pyridine ( pyridine) (33.7 g, 3 equivalents), and stirred at room temperature for about 1 hour. The temperature was raised to 80°C and stirred for 12 hours. After the reaction, the temperature was lowered to room temperature, and 1 mol of HCl was slowly added for titration so that the pH of the solution became about 4. After the resulting powder was filtered and washed with water, the powder was dried in a vacuum oven. The yield was 90%, and the purity (GC) was 98%.

[0123] 1 H-NMR (CDCl3, ppm): 6.42 (d, 1H) 7.44 (d, 2H) 7.75 (d, 2H) 7.80 (d, 1H).

preparation example 2

[0124] Preparation example 2: 2-(4-fluorocinnamate)-5-norbornene (2-(4-fluorocinnamic ester)-5-norbornene) synthesis

[0125] 4-fluorocinnamic acid (4-fluorocinnamic acid) (10g, 60mmol), 5-norbornene-2-methanol (5-norbornene-2-methanol) (7.45g, 60mol), zirconium hydroxide acetate (zirconium (IV) acetate hydroxide) (0.3 g, 0.02 equivalents) were put into 50 ml of toluene together and stirred. Under a nitrogen atmosphere, the temperature was raised to 145° C. and azeotropic reflux was performed for 24 hours. After the reaction, the temperature was lowered to room temperature, and 100% by volume of ethyl acetate (Ethyl acetate) was added. Extract with 1 mol HCl and wash again with water. After drying the organic layer with sodium sulfate and evaporating the solvent, a highly viscous liquid substance was obtained. The yield is 68%, and the purity (GC): 92%.

preparation example 3

[0126] Preparation Example 3: 2-(4-fluorocinnamate)-5-norbornene (2-(4-fluorocinnamic ester)-5-norbornene) polymerization

[0127] After dissolving 2-(4-fluorocinnamate)-5-norbornene (2-(4-fluorocinnamic ester)-5-norbornene) in toluene (toluene) (15ml), blow into nitrogen and stir 30 minute. The temperature was raised to 90 °C and Pd(C) dissolved in methylene chloride (1 ml) was added. 2 h 3 o 2 ) 2 (Pd(acetate) 2 , 4.13 mg, 18.4 μmol), three (cyclohexyl) hydrogen phosphino tetrakis (pentafluorobenzene) borate (tris (cyclohexyl) hydrogen phosphino tetrakis (pentafluorobenz) borate) (37.2 mg, 38.6 μmol), and at 90 ° C Stir at temperature for 15 hours. After the reaction, the temperature was lowered to room temperature, and ethanol was used to obtain a precipitate, which was filtered and then dried in a vacuum oven to obtain the final product NB1. Yield: 85%, Mw: 158k (PDI=2.88).

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Abstract

The present invention relates to a composition for liquid crystal alignment layer, a liquid crystal alignment layer, and a liquid crystal cell. The composition for liquid crystal alignment layer is used to provide a liquid crystal alignment layer that exhibits excellent alignment and maintains stable alignment without disturbance despite external stress such as electrical / thermal stress in a TFT-Cell.

Description

technical field [0001] The invention relates to a composition for a liquid crystal alignment film, a liquid crystal alignment film and a liquid crystal unit (cell). More specifically, the present invention relates to a composition for a liquid crystal alignment film, a liquid crystal alignment film and a liquid crystal alignment film that can provide a liquid crystal alignment film that is excellent in alignment and can maintain alignment without causing film vibration to external stresses such as electrical stress and thermal stress. unit. Background technique [0002] Recently, with the increase in size of liquid crystal displays, their use has gradually expanded from personal use such as mobile phones and laptop computers to home use such as wall-mounted TVs. Accordingly, high-definition, high-end, and wide viewing angles are required for liquid crystal displays. In particular, a thin film transistor liquid crystal display (TFT-LCD) driven by a thin film transistor has a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/56G02F1/1337
CPCC09K2019/0448G02F1/133711C09K19/56C09K19/38G02F1/133788C09K2323/02C08L65/00C08K5/00G02F1/1337
Inventor 柳东雨全成浩崔大胜元永喆高完熙
Owner LG CHEM LTD
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