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

A liquid crystal alignment agent and solvent technology, applied in liquid crystal materials, instruments, optics, etc., can solve problems such as poor printing of liquid crystal display components, and achieve good storage stability and good coating properties

Active Publication Date: 2014-03-26
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the liquid crystal alignment agent stored at low temperature for a long time will produce precipitates in the solution
In addition, once precipitated precipitates are difficult to dissolve again, there is a possibility of causing defects such as poor printing in the manufacturing process of liquid crystal display elements.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0218] In a 50ml four-neck flask with a stirring device and a nitrogen introduction tube, add 0.60g (2.0mmol) of 1,3-bis(4-aminophenylethyl)urea (BAPU) as diamine, and p-phenylenediamine 1.95 g (18.0 mmol) of (p-PDA) was added, and 30 g of N-methyl-2-pyrrolidone (NMP) was added, stirred while feeding nitrogen, and dissolved. While stirring this diamine solution, 3.70 g (18.9 mmol) of 1,2,3,4-cyclobutanetetracarboxylic dianhydride (CBDA) was added as tetracarboxylic dianhydride, and the solid content concentration became 12 wt. %, NMP was added and stirred at room temperature for 4 hours under a nitrogen atmosphere to obtain a polyamic acid (PA-1) solution.

[0219] In this polyamic acid solution 16.24g, add NMP9.94g and diacetone alcohol (DAA) 6.54g (NMP:DAA=60:40 (weight ratio)) as specific solvent (B), obtain polyamic acid concentration: 6.0% by weight of liquid crystal alignment agent (S1).

Embodiment 2～ Embodiment 4 and comparative example 1

[0221] Except that the type of the second solvent used to prepare the liquid crystal alignment agent is changed to the aspects described in the following Table 1, the liquid crystal alignment agent (S2) to the liquid crystal alignment agent (S4) are obtained in the same manner as in Example 1 , Liquid crystal alignment agent (R1).

Embodiment 5

[0223] CBDA19.2g (0.098mol) as tetracarboxylic dianhydride, 1,5-bis(4-aminophenoxy)pentane 24.2g (0.1mol) as diamine were dissolved in NMP343.5g, at room temperature The reaction was carried out for 10 hours. The polymerization reaction proceeded easily and uniformly, and polyamic acid (PA-2) was obtained. To the NMP solution of the polyamic acid (PA-2), 336.4 g of diacetone alcohol (DAA) (NMP:DAA=50:50 (weight ratio)) was added as a specific solvent (B) to obtain the polyamic acid concentration It is 6.0% by weight of liquid crystal alignment agent (S5).

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Abstract

The invention relates to a liquid crystal aligning agent, a liquid crystal aligning film and a liquid crystal display element, wherein the storage stability of the long-term low-temperature storage of substrates is good and the coating property of substrate is excellent. The liquid crystal aligning agent provided by the invention comprises a polymer (A) selected from at least one out of groups formed by polyamic acid, polyimide and polyamide acid ester obtained through the reaction of tetracarboxylic acid dianhydride with diamine, with the presence of specific diamine; and a specific solvent (B).

Description

technical field [0001] The present invention relates to a liquid crystal alignment agent, a liquid crystal alignment film and a liquid crystal display element, in particular to a liquid crystal alignment agent with good storage stability, and a liquid crystal alignment film and a liquid crystal display element produced using the liquid crystal alignment agent. Background technique [0002] In the past, liquid crystal display elements have developed liquid crystal display elements with different driving methods such as electrode structure or the physical properties of liquid crystal molecules used, such as known twisted nematic (Twisted Nematic, TN) type or super twisted nematic ( Super Twisted Nematic (STN) type, Vertical Alignment (VA) type, In-Plane Switching (IPS) type, Fringe Field Switching (FFS) type, Optically Compensated Bend (Optically Compensated Bend) , OCB) type and other liquid crystal display elements. These liquid crystal display elements have a liquid crysta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/56G02F1/1337C08G73/10
CPCC08G73/10C08L79/08C09K19/56G02F1/133723
Inventor 角谷宪一徳久博昭西川通则
Owner JSR CORPORATIOON
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