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Polymerizable compound and its preparation method and application

A technology of polymerizing compounds and compounds, applied in chemical instruments and methods, organic chemistry, liquid crystal materials, etc., can solve problems such as voltage reduction

Active Publication Date: 2021-03-16
JIANGSU HECHENG DISPLAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These may accumulate, especially on electrodes or alignment layers, and there they may reduce the effective applied voltage

Method used

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  • Polymerizable compound and its preparation method and application
  • Polymerizable compound and its preparation method and application
  • Polymerizable compound and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0124] The synthetic route of compound I-1-2 is as follows:

[0125]

[0126] Its specific preparation process is as follows:

[0127] 1) Synthesis of Compound C

[0128] In a 1000mL three-necked flask, add 13.8g compound A, 19g compound B, 300mL toluene, 150mL ethanol, 150mL water, 42.4g anhydrous sodium carbonate, under nitrogen protection, add 0.5g Pd (PPh 3 ) 4 , heated to reflux for 8h, post-treatment, purified by column chromatography to obtain 10.8g of brown solid compound C, GC>97%, yield: 51%.

[0129] 2) Synthesis of compound I-1-2

[0130] In a 500mL three-necked flask, add 10.8g compound C, 200mL toluene, 10.6g methacryloyl chloride, control the temperature to 0°C, add 15.2g triethylamine dropwise, after dropping, stir at room temperature for 6h, post-treatment, and purify by column chromatography 6.2 g of white solid compound I-1-2 was obtained, GC>99%, yield: 44.6%.

[0131] MS m / z: 278 (79%) 209 (8%) 181 (13%) 152 (25%) 69 (100%).

[0132] Referring to ...

Embodiment 2

[0143] Compounds I-1-2, II-1-5, I-3-7 and II-3-7 obtained by the synthesis method in the above examples were mixed with the nematic liquid crystal medium M according to the weight ratio of 0.2%: 99.8%, The mixtures M1, M2, M3 and M4 were obtained, and the obtained mixtures were poured into a 4um VA test cell (the pretilt angle was tested by the crystal rotation method, and recorded as the initial pretilt angle), and at a voltage of 24v, 50mW / cm was used 2 After irradiating UV light for 120s, remove the voltage, continue to use UV light for 60min, and then test the pretilt angle by the crystal rotation method, which is recorded as the UV pretilt angle. The test cell after testing the pretilt angle is driven by a voltage of 12V at 60°C. , and lasted for 48h, and then test the pre-tilt angle at room temperature, which is recorded as the RA pre-tilt angle. The test data is shown in the following table:

[0144] Table 2 Test Properties of Mixtures

[0145] liquid crystal...

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Abstract

The invention provides a polymerizable compound. The polymerizable compound contains at least two ring structure units and one acrylate or methyl acrylate structure unit, wherein at least one ring structure unit is a benzofuran ring structure unit, and at least one ring structure unit is connected with the benzofuran ring structure unit by virtue of a carbon-carbon single bond. The polymerizable compound is selected from a group composed of formulas I and II. The polymerizable compound provided by the invention has the characteristic of stable structure and properties and can effectively forma pretilt angle when being applied to a liquid crystal medium, a high temperature power-up test is carried out for a long time after the pretilt angle is formed, and the pretilt angle still can be stable. The polymerizable compound provided by the invention can be widely applicable to liquid crystal display devices. (The formulas I and II are described in the specification).

Description

technical field [0001] The present invention relates to a polymerizable compound and a liquid crystal medium comprising said polymerizable compound and its use. More specifically, the present invention relates to a polymerizable compound comprising a benzofuran ring structure, a liquid crystal medium comprising the polymerizable compound, and applications thereof. Background technique [0002] Currently used liquid crystal displays (FK-displays) are generally those of the TN ("Twisted Nematic") type. However, these have the drawback of strong contrast viewing angle dependence. In addition, so-called VA ("Vertical Alignment") displays with wider viewing angles are known. The liquid crystal cell of a VA display contains a layer of liquid crystal medium between two transparent electrodes, wherein the liquid crystal medium generally has a negative dielectric (DK-) anisotropy value. In the off state, the molecules of the liquid crystal layer are oriented perpendicular to the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D307/79C07D307/80C09K19/54C08F220/30
CPCC07D307/79C07D307/80C08F220/30C09K19/544C09K2019/548C08F220/301
Inventor 韩文明徐爽马文阳徐海彬陈昭远俞燕蕾
Owner JIANGSU HECHENG DISPLAY TECH CO LTD
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