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Diamine, polyamic acid or derivative thereof, liquid crystal alignment agent, liquid crystal alignment film, and liquid crystal display element

A technology of polyamic acid and derivatives, which is applied in liquid crystal materials, chemical instruments and methods, organic chemistry, etc., and can solve problems such as brightness reduction and grayscale display hindrance

Inactive Publication Date: 2017-08-25
JNC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the ion density is high, the voltage applied to the liquid crystal during the frame period decreases, and as a result, the luminance may decrease and normal grayscale display may be hindered.
In addition, for example, even if the initial ion density is low, the case where the ion density increases after the high-temperature test is not preferable

Method used

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  • Diamine, polyamic acid or derivative thereof, liquid crystal alignment agent, liquid crystal alignment film, and liquid crystal display element
  • Diamine, polyamic acid or derivative thereof, liquid crystal alignment agent, liquid crystal alignment film, and liquid crystal display element
  • Diamine, polyamic acid or derivative thereof, liquid crystal alignment agent, liquid crystal alignment film, and liquid crystal display element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0704] [Example 1] Preparation of varnish

[0705] Put compound DI-5-1 (m=1) 1.2698g into a 200mL eggplant-shaped flask equipped with a thermometer, a nitrogen purge port, and a stirring bar, and formula (1) synthesized by the method described in Japanese Patent Application Laid-Open No. 50-19897 The indicated compound was 2.0774g, NMP 59.0g and GBL 15.0g were added. The solution was cooled to 5° C. or lower, 1.3969 g of the compound represented by the formula (AN-3-2) and 1.2560 g of the compound represented by the formula (PA-1) were charged thereinto, and further stirred at room temperature for 6 hours. To this, 20.0 g of butyl cellosolve (BC) was added, heated and stirred at 70° C. until the viscosity of the solution became about 35.0 mPa·s, and varnish 1 having a solid content of 6 wt % was obtained. The weight average molecular weight (Mw) of this varnish was 67000.

Embodiment 2～ Embodiment 23 and comparative example 1～5

[0707] According to the method described in Example 1, the following varnish with a solid content of 6 wt % was obtained. The composition and weight average molecular weight (Mw) of the obtained varnish are shown in Table 1-1 and Table 1-2. Example 1 is described again. The inside of [ ] represents the molar ratio of each in the tetracarboxylic acid compound group and the diamine compound group.

[0708] [Table 1-1]

[0709]

[0710] [Table 1-2]

[0711]

Embodiment 24

[0713]

[0714] Weighed 10 g of varnishes 1 in a 50 mL eggplant-shaped flask, added 10 g of N-methyl-2-pyrrolidone and 10 g of butyl cellosolve there, shaken for 2 hours, and obtained liquid crystal aligning agent 1 with a solid content of 3 wt %. This alignment agent 1 was applied to the glass substrate with ITO electrodes and the glass substrate with column spacers / ITO electrodes by spin coating (2000 rpm, 15 seconds). After coating the film, it prebaked at 80 degreeC for about 5 minutes, and then baked at 200 degreeC for 30 minutes, and formed the liquid crystal aligning film with a film thickness of about 100 nm. Using a brushing treatment device manufactured by Iinuma Gauge Manufacturing Co., Ltd., the brushing cloth (bristle length: 1.9mm: rayon) has a bristle length pressing of 0.40mm, a base moving speed of 60mm / sec, and a roller. Under the condition that the rotation speed is 1000 rpm, the obtained polyimide film is subjected to brushing treatment. After the obtain...

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Abstract

The invention relates to a diamine, a polyamic acid or a derivative thereof, a liquid crystal alignment agent, a liquid crystal alignment film, and a liquid crystal display element. The present invention relates to a liquid crystal alignment agent containing a polyamic acid or a derivative thereof, and the polyamic acid or its derivative is obtained by reacting a tetracarboxylic dianhydride with a diamine containing a compound represented by the formula (1). By using the liquid crystal alignment agent of the present invention, it is possible to form a liquid crystal alignment film of a liquid crystal display device which does not deteriorate under strong light exposure for a long period of time.

Description

technical field [0001] This invention relates to the polyamic acid which used the diamine represented by formula (1) as a raw material, its derivative(s), the liquid crystal aligning agent containing this polyamic acid, and its derivative(s), and a liquid crystal display element. Background technique [0002] Among the liquid crystal display elements widely distributed in the form of products today, display elements using nematic liquid crystals are mainstream. The TN (twisted nematic, Twisted Nematic) mode and the STN (super twisted nematic, Super Twisted Nematic) mode are well known as the display system of a nematic liquid crystal display element. In recent years, in order to improve the narrow viewing angle which is one of the problems of these modes, a TN-type liquid crystal display element using an optical compensation film, and an MVA (multi-domain vertical alignment, multi-domain vertical alignment, Multi-domain Vertical Alignment) mode, IPS (In-Plane Switching) mod...

Claims

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Application Information

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IPC IPC(8): C07D295/192C09K19/56C08G73/10
CPCC07D295/192C08G73/1007C08G73/1067C08G73/1075C08G73/1078C09K19/56
Inventor 伊泽启介
Owner JNC CO LTD
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