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Liquid crystal alignment composition, method for preparing liquid crystal alignment film using same, and liquid crystal alignment film using same

一种液晶取向、液晶取向剂的技术，应用在液晶材料、化学仪器和方法、仪器等方向，能够解决难以确保生产率、大量能量、聚酰亚胺难以表现出高电压保持率等问题，达到降低光照射能量、高电压保持率、增强取向特性和稳定性的效果

Active Publication Date: 2021-12-14
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since a large amount of energy is required to obtain sufficient liquid crystal alignment characteristics by subjecting the polyimide film to light irradiation, it is difficult to ensure productivity in practice, and furthermore, there is a limitation that an additional heat treatment process is required after light irradiation to ensure orientation stability
[0008] In addition, for high-quality driving of liquid crystal display devices, high voltage holding ratio (VHR) should be exhibited, but it is difficult to express high voltage holding ratio by using only polyimide

Method used

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  • Liquid crystal alignment composition, method for preparing liquid crystal alignment film using same, and liquid crystal alignment film using same
  • Liquid crystal alignment composition, method for preparing liquid crystal alignment film using same, and liquid crystal alignment film using same
  • Liquid crystal alignment composition, method for preparing liquid crystal alignment film using same, and liquid crystal alignment film using same

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0137] Preparation Example 1: Synthesis of Diamine DA-1

[0138] Diamine DA-1 was synthesized according to the following reaction.

[0139]

[0140] Specifically, CBDA (cyclobutane-1,2,3,4-tetracarboxylic dianhydride) and 4-nitroaniline were dissolved in DMF (dimethylformamide) to prepare a mixture. Then, the mixture was reacted at about 80° C. for about 12 hours to prepare amic acid. Subsequently, amic acid was dissolved in DMF, and acetic anhydride and sodium acetate were added thereto to prepare a mixture. Then, the amic acid contained in the mixture was imidized at about 90° C. for about 4 hours. The imide thus obtained was dissolved in DMAc (dimethylacetamide), and then palladium on carbon (Pd—C) was added thereto to prepare a mixture. The mixture was reduced at 45° C. for 20 minutes under a hydrogen pressure of 6 bar to prepare diamine DA-1.

preparation example 2

[0141] Preparation Example 2: Synthesis of Diamine DA-2

[0142]

[0143] DA-2 having the above structure was prepared in the same manner as in Preparation Example 1, except that DMCBDA (1,3-dimethylcyclobutane-1,2,3,4-tetracarboxylic dianhydride) was used Instead of CBDA (cyclobutane-1,2,3,4-tetracarboxylic dianhydride).

preparation example 3

[0144] Preparation Example 3: Synthesis of Diamine DA-3

[0145] Diamine DA-3 was synthesized according to the following reaction.

[0146]

[0147] Specifically, 25 g of CBDA (cyclobutane-1,2,3,4-tetracarboxylic dianhydride) was added to 250 mL of methanol, 1 to 2 drops of hydrochloric acid were added thereto, and the mixture was heated at 75°C under reflux Heat for 5 hours. After removing the solvent under reduced pressure, 300 mL of ethyl acetate and n-hexane were added to solidify the solution. The resulting solid was collected by vacuum filtration and dried at 40 °C under reduced pressure to obtain 32 g of M1.

[0148] To 34 g of the obtained M1 was added 100 mL of toluene, and then 35 g of oxalyl chloride was added dropwise at room temperature. 2 to 3 drops of dimethylformamide (DMF) were added dropwise and the mixture was stirred at 50°C for 16 hours. After cooling to room temperature, the solvent and residual oxalyl chloride were removed under reduced pressure. ...

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Abstract

The present invention relates to a liquid crystal alignment composition for preparing a liquid crystal alignment film having enhanced alignment characteristics and stability and exhibiting a high voltage retention rate, a method for preparing a liquid crystal alignment film using the same, and a liquid crystal alignment composition using the same films and liquid crystal display devices.

Description

technical field [0001] Cross References to Related Applications [0002] This application claims priority benefit from Korean Patent Application No. 10-2016-0077525 filed with the Korean Intellectual Property Office on June 21, 2016, the disclosure of which is incorporated herein by reference in its entirety. [0003] The present invention relates to a liquid crystal alignment composition having enhanced alignment characteristics and stability and exhibiting high voltage retention, a method for preparing a liquid crystal alignment film using the same, and a liquid crystal alignment film and a liquid crystal display device using the same. Background technique [0004] In a liquid crystal display device, a liquid crystal alignment film plays a role of orienting a liquid crystal in a specific direction. In particular, the liquid crystal alignment film acts as a director in the alignment of liquid crystal molecules, and thus, when the liquid crystal is moved by an electric fiel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1337C07D303/16C09D179/08C09K19/56
CPCC09K19/56C09D179/08C08G73/1078G02F1/133711C08G73/1046G02F1/133723C09K2323/027C09K2323/025G02F1/133788
Inventor 曹正镐韩熙朴姮娥权纯湖尹陖荣尹亨硕
Owner LG CHEM LTD
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