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Chiral compound, liquid crystal composition containing the same, optically anisotropic body, and liquid crystal display device

a liquid crystal composition and compound technology, applied in the field of liquid crystal materials, can solve the problems of low solubility, complicated synthesis process, low hip value of chiral additives in the prior art, etc., and achieve the effect of reducing the addition amount of chiral compound, good solubility and high htp valu

Active Publication Date: 2019-11-21
SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]An objective of the present invention is to provide a chiral compound having a high HIP value, which not only can reduce the use amount of the chiral compound, but also can reduce costs, and can also achieve a smaller change in the performance of a liquid crystal composition.
[0029]The beneficial effects of the present invention lie in that compared with the prior art, the chiral compound proposed by the present invention has a high HTP value and a good solubility; a highly helical and twisted liquid crystal composition can be prepared by adding a small amount of the chiral compound; reducing the addition amount of the chiral compound can reduce the negative effect of the chiral compound on the parameters of the liquid crystal composition; under the conditions of the same addition ratio and the same helical pitch, the chiral compound can reduce the response time of the liquid crystal composition; in addition, the chiral compound has a simple structure and greatly reduces the synthesis cost.

Problems solved by technology

The existing disclosed chiral additives are, for example, as described in patents WO 2002006195, WO 9800428, WO 2007039104, WO 2007039105 and WO 2005023742; however, the chiral additives in the prior art generally have a low HIP value, a low solubility or a complicated synthesis process.

Method used

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  • Chiral compound, liquid crystal composition containing the same, optically anisotropic body, and liquid crystal display device
  • Chiral compound, liquid crystal composition containing the same, optically anisotropic body, and liquid crystal display device
  • Chiral compound, liquid crystal composition containing the same, optically anisotropic body, and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0050]The structural formula of the polymerizable compound is as represented by the following formula:

[0051]The steps of the preparation thereof are as follows:

[0052]Step 1. The Preparation Route is as Follows:

[0053]Specific Operation Procedures of the Preparation:

[0054]30.7 g (0.20 moles) of diethyl malonate is dissolved in 200 ml of anhydrous ethanol, 4.7 g (0.20 moles) of sodium metal is added under nitrogen protection, 30 g (0.187 moles) of colourless liquid bromocyclopentane is added dropwise after sodium blocks disappeared, and after the addition is complete, the reaction is refluxed for 4 hours.

[0055]The reaction liquid is cooled to room temperature, 1 L of water is poured, extraction is carried out with 100 ml petroleum ether for three times, the petroleum ether phases are combined and washed with water twice, the solvent is distilled off under reduced pressure, reduced pressure distillation is carried out to distil off fractions with a boiling point of lower than 95° C. / 700...

example 2

[0077]The structural formula of the chiral compound is as represented by the following formula:

[0078]Step 1: This step is the same as Step 1 of Example 1, except that bromocyclopentane is replaced with 3-propyl bromocyclopentane to prepare diethyl 2-(3-propylcyclopentyl) malonate.

[0079]Step 2. The Preparation Route is as Follows:

[0080]Specific Operation Procedures of the Preparation:

[0081]85.2 g (0.3 moles) of diethyl 2-(3-propylcyclopentyl) malonate prepared in Step 1 and 63.6 g (0.6 moles) of sodium carbonate are stirred together in 300 ml of ethanol and 100 ml of water overnight.

[0082]300 ml of water is added, the pH is adjusted to strongly acidic using dilute hydrochloric acid, extraction is carried out using 100 ml of toluene twice, washing is carried out with water twice, the solvent is distilled off under reduced pressure, and recrystallization is carried out using toluene to obtain 21.3 g of 2-(4-propylcyclopentyl) malonic acid being a white solid with a yield of 31%.

[0083]S...

example 3

[0089]The structural formula of the chiral compound is as represented by the following formula:

[0090]Step 1: This step is the same as Step 1 of Example 1, except that bromocyclopentane is replaced with bromocyclobutane to prepare diethyl cyclobutylmalonate:

[0091]Specific Operation Procedures of the Preparation:

[0092]30 g (0.18 moles) of diethyl malonate is dissolved in 200 ml of anhydrous ethanol, 5.1 g (0.22 moles) of sodium metal is added under nitrogen protection, 30 g (0.157 moles) of colourless liquid bromocyclobutane is added dropwise after sodium blocks disappeared, and after the addition is complete, the reaction is refluxed for 4 hours.

[0093]1 L of water is poured, extraction is carried out with 100 ml of petroleum ether for three times, the petroleum ether phases are combined and washed with water twice, the solvent is distilled off under reduced pressure, reduced pressure distillation is carried out to distil off fractions with boiling points of lower than 112° C. / 920 Pa,...

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Abstract

Disclosed are a chiral compound, a liquid crystal composition containing the chiral compound, an optically anisotropic body and a liquid crystal display device. The structural formula of said chiral compound is as represented by the following formula I:The chiral compound has a high HTP value and a good solubility; a highly helical, twisted liquid crystal composition can be prepared by adding a small amount of the chiral compound; reducing the addition amount of the chiral compound can reduce the negative effect of the chiral compound on the parameters of the liquid crystal composition; under the conditions of the same addition ratio and the same helical pitch, the chiral compound can reduce the response time of the liquid crystal composition; in addition, the chiral compound has a simple structure and greatly reduces the synthesis cost.

Description

TECHNICAL FIELD[0001]The present invention relates to the technical field of liquid crystal materials. More specifically, the present invention relates to a chiral compound, a liquid crystal composition containing the chiral compound, an optically anisotropic body, and a liquid crystal display device.BACKGROUND ART[0002]Liquid crystals have a variety of phase states, such as a smectic phase arranged in a lamellar manner, a nematic phase and a cholesteric phase with a helical structure, wherein the nematic liquid crystals can be further classified according to the relative orientation of molecules, and the smectic phase is the most common arrangement manner, in which the molecules are arranged in layers. Another common phase is the cholesteric phase, or referred to as a chiral nematic phase, in which the orientation of each layer of molecules is slightly twisted from the adjacent layer, thereby forming a helical, twisted structure in natural state. When a voltage is applied to such a...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C09K19/34
CPCC09K19/3402C07D321/00C09K19/46G02F1/13C09K19/586
Inventor BAO, YONGFENGYUN, GUOLIANGMENG, JINSONGLI, MINGZHANG, HUBOZHAO, LEILIANG, ZHIAN
Owner SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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