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Liquid crystal alignment agent and liquid crystal display unit

A liquid crystal alignment agent and solvent technology, which is applied in liquid crystal materials, chemical instruments and methods, optics, etc., can solve problems such as lack of electrical properties of liquid crystal alignment film, difficulty in ensuring the uniformity of liquid crystal alignment agent printing, etc.

Active Publication Date: 2009-01-07
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the contrary, as a disadvantage of increasing the size of the substrate, it is difficult to ensure the uniformity of printing of the liquid crystal aligning agent in the range of a large area.
In particular, when using an offset printing machine that has been widely used to form a liquid crystal alignment film in a large area, there may be cases where the electrical properties of the liquid crystal alignment film do not exist due to poor printing of the liquid crystal alignment agent.

Method used

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  • Liquid crystal alignment agent and liquid crystal display unit
  • Liquid crystal alignment agent and liquid crystal display unit
  • Liquid crystal alignment agent and liquid crystal display unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0125] Hereinafter, although an Example demonstrates this invention more concretely, this invention is not limited to these Examples.

Synthetic example 1

[0127] In N-methyl-2-pyrrolidone, 10 mmol of the compound represented by the above formula (11) as a diamine compound, 70 mmol of p-phenylenediamine and 20 mmol of 4,4'-diaminodiphenylmethane and tetracarboxylic 100mmol of acid dianhydride 2,3,5-tricarboxycyclopentylacetic acid dianhydride, the total amount of tetracarboxylic dianhydride and diamine compound is 20% by weight relative to the total solution of the solution, at 60 ° C The reaction was carried out for 4 hours to obtain a solution containing polyamic acid.

[0128] To this polyamic acid-containing solution, pyridine and acetic anhydride were added in an amount twice the mole of the total amount (theoretical value) of the amic acid structure contained in the polyamic acid, and then heated to 110° C. for 4 hours for dehydration. closed loop reaction.

[0129] The obtained solution was added to a large excess of diethyl ether to obtain a precipitate, which was recovered and dried under reduced pressure to obtain a po...

Synthetic example 2

[0131] 110g (0.50 mol) of tetracarboxylic dianhydride as 2,3,5-tricarboxycyclopentyl acetic dianhydride and 38g (0.35 mol) of p-phenylenediamine as diamine, 20g (0.1 mol) of 4,4 '-Diaminodiphenylmethane and 26g (0.05 moles) of 3-(3,5-diaminobenzoyl)cholestane were dissolved in 800g of N-methyl-2-pyrrolidone at 60°C for 6 hours reaction to obtain a solution containing polyamic acid. A small amount of the obtained polyamic acid solution was taken out, N-methyl-2-pyrrolidone was added to prepare a solution having a polyamic acid concentration of 10% by weight, and the solution viscosity was measured to be 60 mPa·s.

[0132] Next, 1800 g of N-methyl-2-pyrrolidone was added to the obtained polyamic acid solution, 80 g of pyridine and 100 g of acetic anhydride were added, and a dehydration ring-closure reaction was performed at 110° C. for 4 hours. After the dehydration ring-closure reaction, the solvent in the system is replaced with new γ-butyrolactone (by this solvent replacemen...

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Abstract

The present invention relates to an aligning agent for liquid crystal containing at least a polymer and solvent selected from polyamic acid and polyimide gained by dewatering closed-loop, the solvent contains: (A) a first solvent containing compound with formula (I); (B) a second solvent selected from at least one of N-methyl-2-pyrrolidone, gamma-butyrolactone, 1,3-dimethyl-2-imidazolone, N, N-dimethylformamide and N, N- dimethylacetylamide; and (C) a third solvent selected from at least one of butyl cellosolve, diacetone alcohol, carbonic sub-propyl ester, diethylene glycol diethyl aether and ethyl-3- oxethyl propionic ether. (In formula (I) the R respectively represents alkyl with 3 to 10 carbon atoms).

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent and a liquid crystal display element. More specifically, it relates to a liquid crystal aligning agent which is good in coatability by an inkjet coating method and can be used to provide a liquid crystal aligning film having excellent properties such as liquid crystal aligning ability, and a liquid crystal display element excellent in display characteristics and reliability. . Background technique [0002] Currently, as a liquid crystal display element, a TN type liquid crystal display element having a so-called TN (twisted nematic, Twisted Nematic) type liquid crystal cell is known. A liquid crystal alignment film including polyamic acid, polyimide, etc. is formed on the substrate surface of a transparent conductive film such as indium-tin oxide), and it is used as a substrate for a liquid crystal display element. A nematic liquid crystal layer with positive dielectric anisotropy is fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337
CPCC09K19/56G02F1/1337
Inventor 福间聪司林英治中田正一
Owner JSR CORPORATIOON
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