Liquid crystal aligning agent, liquid crystal alignment layer and liquid crystal display device

A technology of liquid crystal alignment agent and polyamic acid, applied in liquid crystal materials, instruments, optics, etc., to achieve good long-term reliability and low ion density

Active Publication Date: 2010-10-20
SHENZHEN DALTON ELECTRONICS MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] These previous technologies are used as liquid crystal alignment agents to form current liquid crystal alignment films that require further improvement, and there is still room for further research in terms of the electrical properties of the obtained liquid crystal alignment films and the materials used to obtain the required electrical properties.

Method used

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  • Liquid crystal aligning agent, liquid crystal alignment layer and liquid crystal display device
  • Liquid crystal aligning agent, liquid crystal alignment layer and liquid crystal display device
  • Liquid crystal aligning agent, liquid crystal alignment layer and liquid crystal display device

Examples

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example

[0213]Hereinafter, the present invention will be described by way of examples. In addition, the compounds used in Examples are as described below.

[0214]

[0215] Anhydride (1): pyromellitic dianhydride

[0216] Anhydride (19): 1,2,3,4-cyclobutanetetracarboxylic dianhydride

[0217] Anhydride (23): 1,2,3,4-butanetetracarboxylic dianhydride

[0218] Anhydride (25): 1,2,4,5-cyclohexanetetracarboxylic dianhydride

[0219]

[0220] Diamine (N-1): N,N'-bis(4-aminophenyl)cyclohexane-1,2-diamine

[0221] Diamine (V-1): 4,4'-diaminodiphenylmethane

[0222] Diamine (V-7): 4,4'-diamino-1,2-diphenylethane

[0223] Diamine (VI I-2): 1,3-bis(4-(4-aminophenylmethyl)phenyl)propane

[0224] Diamine (XI I-2-1) (R 29 = n-heptyl): 1,1-bis(4-(4-aminophenylmethyl)phenyl)-4-n-heptylcyclohexane

[0225] Diamine (XII-4-1) (R 30 = n-pentyl): 1,1-bis(4-(4-aminophenoxy)phenyl)-4-(trans-4-n-pentylcyclohexyl)cyclohexane

[0226]

[0227] NMP: N-methyl-2-pyrrolidone

[0228] BC: Butyl ce...

Synthetic example 1

[0231] 3.532 g of diamine (N-1) and 50.0 g of dehydrated NMP were added to a 100 mL four-necked flask equipped with a thermometer, a stirrer, a raw material inlet, and a nitrogen gas inlet, and they were stirred and dissolved under a dry nitrogen stream. Next, 1.300 g of compound (1), 1.169 g of compound (19), and 24.0 g of dehydrated NMP were added, and reacted at room temperature for 30 hours. When the reaction temperature rises during the reaction, the reaction temperature is suppressed to about 70° C. or lower to allow the reaction. Then, 20.0 g of BC was added to the resulting solution to obtain a polyamic acid solution having a concentration of 6% by weight. This polyamic acid is referred to as PA1. The weight average molecular weight of PA1 was 108800.

[0232] The weight-average molecular weight of polyamic acid is obtained by the following method: utilize phosphoric acid-DMF mixed solution (phosphoric acid / DMF=0.6 / 100: weight ratio) to dilute the obtained polyamic a...

Synthetic example 2～10

[0234] Except having changed tetracarboxylic dianhydride and diamine as shown in Table 1, polyamic-acid solution (PA2) - (PA10) was prepared according to the synthesis example 1. The results including Synthesis Example 1 are summarized in Table 1.

[0235]

[0236]

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Abstract

The present invention relates to a liquid crystal aligning agent, a liquid crystal aligning layer and a liquid crystal display device. The objective of the invention is to develop a usable liquid crystal aligning agent used for a liquid crystal display device having high voltage holding rate and implementing the stability of the voltage holding rate for a long time. The liquid crystal aligning agent contains polyamic acid or its derivatives obtained by reacting tetracarboxylic dianhydride with special diamine using a bivalence organic group containing nitrogen atoms as residue.

Description

technical field [0001] The present invention relates to a liquid crystal alignment agent comprising a polyamide obtained by reacting diamine having a nitrogen atom-containing divalent organic group as a residue with tetracarboxylic dianhydride Acid (polyamic acid) or its derivative (derivative). Moreover, the present invention also relates to a liquid crystal alignment film obtained from the liquid crystal alignment agent and a liquid crystal display element comprising the liquid crystal alignment film. Background technique [0002] Liquid crystal display devices are used in various liquid crystal displays such as viewfinders of video cameras and projection displays, represented by monitors of notebook computers and desktop computers. Among display devices, recently, it is also used in televisions. In addition, liquid crystal display elements are also used in optoelectronics-related elements such as optical printer heads, optical Fourier transform elements, and light valve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/56C08L79/08G02F1/1337
Inventor 近藤史尚藤马大亮片野裕子
Owner SHENZHEN DALTON ELECTRONICS MATERIAL CO LTD
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