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

A liquid crystal alignment agent, liquid crystal technology, applied in the direction of liquid crystal materials, chemical instruments and methods, instruments, etc.

Active Publication Date: 2019-10-11
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the requirements for high performance, high precision, and large-scale liquid crystal display elements are gradually increasing. The scratches on the surface of the alignment film, dust generation, mechanical force, and static electricity caused by brushing treatment, and then Various problems such as inhomogeneity in the orientation treatment plane become apparent

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0119] Although an Example is given to the following and this invention is demonstrated more concretely, this invention is not limited to these. The abbreviations of the compounds in the following and the measurement methods of each characteristic are as follows.

[0120] NMP: N-methyl-2-pyrrolidone

[0121] GBL: gamma-butyrolactone

[0122] BCS: Butyl Cellosolve

[0123] DA-1: 1,2-bis(4-aminophenoxy)ethane

[0124] DA-2: bis(4-aminophenoxy)methane

[0125] DA-3: N-tert-butoxycarbonyl-N-(2-(4-aminophenyl)ethyl)-N-(4-aminobenzyl)amine

[0126] DA-4: p-phenylenediamine

[0127] DA-5: Refer to the following formula (DA-5)

[0128] DA-6: 4,4’-Diaminodiphenylamine

[0129] DA-7: 4,4’-Diaminodiphenylmethane

[0130] DA-8: Refer to the following formula (DA-8)

[0131] CA-1: Refer to the following formula (CA-1)

[0132] CA-2: Refer to the following formula (CA-2)

[0133] CA-3: Refer to the following formula (CA-3)

[0134] CA-4: Refer to the following formula (CA-4)

...

Synthetic example 2～12

[0164] Using the diamine component, the tetracarboxylic acid component and NMP shown in the following Table 1, the reaction temperature and the solid content concentration were carried out in the same manner as in Synthesis Example 1 to obtain the polyamic acid solution shown in the following Table 1. (B) ~ (L). In addition, the viscosity and molecular weight of the obtained polyamic acid are shown in Table 1 below.

[0165] [Table 1]

[0166]

[0167]

[0168] 30 g of the obtained polyamic-acid solution (A) was taken in the 100-ml four-necked flask equipped with a stirring device and a nitrogen introduction tube, NMP 15.0g was added, and it stirred for 30 minutes. To the obtained polyamic acid solution, 3.32 g of acetic anhydride and 0.43 g of pyridine were added, followed by heating at 55° C. for 3 hours to perform chemical imidization. The resulting reaction solution was added to 213 ml of methanol while being stirred, and the deposited precipitate was collected by f...

Synthetic example 14～23

[0170] Except using the polyamic acid solution, NMP, acetic anhydride, pyridine and methanol shown in the following Table 2, it was carried out in the same manner as in Synthesis Example 13 to obtain the polyimide resin shown in the following Table 2. Powder (B) ~ (K).

[0171] [Table 2]

[0172]

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Abstract

Provided is a liquid crystal alignment agent containing at least one polymer selected from among polyimide precursors and polyimides that are imidized products thereof obtained from: a tetracarboxylicacid derivative component containing at least one substance selected from among a tetracarboxylic acid dianhydride represented by formula (1) and derivatives thereof and at least one substance selected from among a tetracarboxylic acid dianhydride represented by formula (2) and derivatives thereof; and a diamine component containing at least one diamine selected from between formulas (3) and (4).

Description

technical field [0001] This invention relates to the liquid crystal aligning agent used for manufacture of a liquid crystal display element, the liquid crystal aligning film obtained from this liquid crystal aligning agent, and the liquid crystal display element using this liquid crystal aligning film. Background technique [0002] Liquid crystal display elements used in liquid crystal televisions, liquid crystal displays, etc. are generally provided with a liquid crystal aligning film for controlling the alignment state of liquid crystals in the element. At present, the most popular liquid crystal alignment film in the industry is produced as follows: the surface of the film formed by polyamic acid and / or its imidized polyimide formed on the electrode substrate is covered with cotton, nylon, It is produced by rubbing cloth such as polyester in one direction, which is called brushing treatment. [0003] The brushing process of the film surface in the orientation process of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337C08G73/10
CPCC08G73/10G02F1/1337C09K19/56C08G73/1042C08G73/1039C08L79/08
Inventor 国见奈穗宫本泰宏杉山崇明
Owner NISSAN CHEM IND LTD
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