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

A technology of liquid crystal alignment agent and carbon number, applied in liquid crystal materials, instruments, optics, etc., can solve the problems of general products without structure and inconvenience

Inactive Publication Date: 2011-01-05
JNC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the liquid crystal alignment agents obtained by using these prior techniques, there is still room for further research on the subject of ion density reduction.
[0010] It can be seen that the above-mentioned existing liquid crystal alignment agent, liquid crystal alignment film and liquid crystal display element obviously still have inconvenience and defects in structure and use, and need to be further improved urgently.
In order to solve the above-mentioned problems, the relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and the general products do not have a suitable structure to solve the above-mentioned problems. This is obviously related. The problem that the industry is eager to solve

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

example

[0210] Hereinafter, the present invention will be described using examples. In addition, compounds used in Examples are as follows.

[0211]

[0212] Anhydride (1): pyromellitic dianhydride

[0213] Anhydride (19): 1,2,3,4-cyclobutanetetracarboxylic dianhydride

[0214] Anhydride (23): 1,2,3,4-butanetetracarboxylic dianhydride

[0215] Anhydride (68): ethylenediaminetetraacetic dianhydride

[0216]

[0217] Diamine (N-3): 1,4-bis(2-aminoethyl)piperazine

[0218] Diamine (N-4): 1,4-bis(3-aminopropyl)piperazine

[0219] Diamine (V-1): 4,4'-diaminodiphenylmethane

[0220] Diamine (V-7): 4,4'-diamino-1,2-diphenylethane

[0221] Diamine (V-35): 4,4'-diamino-diphenylamine

[0222] Diamine (VII-13): 2,2-bis(4-(4-aminophenoxy)phenyl)propane

[0223] Diamine (VIII-5-1): 5-[[4-(4'-pentyl[1,1'-bicyclohexyl]-4-yl)phenyl]methyl]-1,3-diamino benzene

[0224] Diamine (XII-2-1): 1,1-bis[4-(4-aminophenyl)methylphenyl]-4-n-heptylcyclohexane

[0225] Diamine (XII-4-1): 1,1-bis[4-(...

Synthetic example 1

[0239] In a 100mL four-necked flask equipped with a thermometer, a stirrer, a raw material inlet and a nitrogen inlet, add 0.8242g of compound (XII-4-1), 2.1686g of compound (V-1) and 0.2739g of compound (N -4) and 20.0 g of dehydrated NMP were stirred and dissolved under a stream of dry nitrogen. Next, 0.4473 g of compound (1), 1.6088 g of compound (19), 0.6772 g of compound (23) and 50.0 g of dehydrated NMP were added, and reacted at 75° C. for 8 hours and then at room temperature for 15 hours. 24.0 g of BC was added to the obtained solution, and the polyamic-acid solution whose density|concentration of the polymer solid content (hereinafter abbreviated as polymer solid content) containing an unreacted monomer and a by-product was 6 weight% was obtained. Let this polyamic acid be PA1. The weight average molecular weight of PA1 was 25,100.

[0240] The weight-average molecular weight of polyamic acid is obtained by the following method: the obtained polyamic acid is diluted...

Synthetic example 2～17

[0242] Except having changed tetracarboxylic dianhydride and diamine to what is shown in Table 1, polyamic-acid solution (PA2)-(PA17) was prepared according to the synthesis example 1. The results including Synthesis Example 1 are summarized in Table 1.

[0243] Table 1

[0244]

[0245] Table 1 (continued)

[0246]

[0247]

[0248] The liquid crystal alignment agent was left to stand in a freezer at -20° C. for one month. At this time, it was judged as “failure” when polymer precipitation was observed, and “good” when no polymer precipitation was observed.

[0249] Table 2

[0250] Polyamic acid solution No.

[0251] PA8

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Abstract

The present invention relates to a liquid crystal aligning agent, a liquid crystal aligning film and a liquid crystal display device. To improve display quality of the liquid crystal display device, the ion density of important characteristics required to the liquid crystal aligning film can be enumerated. If the ion density is high, the voltage applied to the liquid crystal in a frame period will be reduced, as a result, the lighteness will be reduced to bring obstruction to normal greyscale display. In addition, even if an initial ion density is low, a condition that the ion density (long-term reliability) is increased after a high-temperature acceleration test is not optimized. The ion density of the liquid crystal display device formed by using the liquid crystal aligning agent is low, and the long-term stability of the liquid crystal display device is excellent. The liquid crystal aligning agent contains a polyamic acid obtained by reacting a specific diamine containing piperazine rings in molecules or a mixture containing the diamine and other diamine with at least two tetracarboxylic acid dianhydrides at a temperature from 70 to 200 DEG C.

Description

technical field [0001] The present invention relates to a liquid crystal alignment agent comprising polyamic acid (polyamic acid) obtained by reacting diamine and tetracarboxylic dianhydride. Furthermore, the present invention also relates to a liquid crystal alignment film obtained from the liquid crystal alignment agent and a liquid crystal display element including 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. Furthermore, liquid crystal elements are also used in optoelectronics-related elements such as optical printer heads, optical Fourier transform elements, and light bulbs. [0003] Various elements are known in the liquid crystal display element, and the technical development of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/56G02F1/1337C08L79/08C08G73/10
CPCC08G73/1075C08L79/08C09K19/56G02F1/133723
Inventor 近藤史尚
Owner JNC CORP
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