Liquid crystal compound having negative dielectric anisotropy, liquid crystal composition using this and liquid crystal display device

A technology of liquid crystal composition and compound, which is applied in the field of liquid crystal composition and novel liquid crystal compound, to achieve the effects of excellent compatibility, realizing contrast and improving response speed

Active Publication Date: 2015-03-11
JNC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Moreover, the compounds represented by formula (s-3), formula (s-4) and formula (s-5) have small optical anisotropy, nematic The upper limit temperature of the phase is low, and the liquid crystal phase is not displayed
Furthermore, the compounds represented by formula (s-5), formula (s-7), formula (s-8) and formula (s-9) have small optical anisotropy, low upper limit temperature of nematic phase, and low dielectric The anisotropy is small, so the driving voltage cannot be lowered for the liquid crystal composition containing these compounds
In addition, the compounds represented by the formula (s-3) and the formula (s-6) have problems such as insufficient low-temperature compatibility, etc., and further improvement is required.

Method used

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  • Liquid crystal compound having negative dielectric anisotropy, liquid crystal composition using this and liquid crystal display device
  • Liquid crystal compound having negative dielectric anisotropy, liquid crystal composition using this and liquid crystal display device
  • Liquid crystal compound having negative dielectric anisotropy, liquid crystal composition using this and liquid crystal display device

Examples

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preparation example Construction

[0168] The preparation of the liquid crystal composition of the present invention is conventionally prepared by a known method, for example, a method of dissolving essential components at high temperature. In addition, additives well known to those skilled in the art, such as optically active compounds or polymerizable compounds described below, can also be added according to the application to prepare the liquid crystal composition of the present invention including a polymerization initiator, adding Liquid crystal composition for guest-host··Guest-Host, GH··type of dye. In general, additives are well known to those skilled in the art, and are described in detail in literature and the like.

[0169] The liquid crystal composition of the present invention may further contain one or more optically active compounds.

[0170] Optically active compounds are added with known chiral dopants. The chiral dopant has the effects of inducing a helical structure of liquid crystals, adju...

example

[0202] [Examples of Liquid Crystalline Compound (1)]

[0203] Hereinafter, the present invention will be described in more detail by examples. However, the present invention is not limited to these examples. In addition, unless otherwise specified, "%" means "wt%". The obtained compound was obtained by using 1 The nuclear magnetic resonance spectrum obtained by H-NMR analysis, and the gas chromatogram obtained by gas chromatography (Gas Chromatography, GC) analysis are used for identification. The measurement method using the above nuclear magnetic resonance spectrum and gas chromatogram is in accordance with the method described below. Furthermore, in each example, C represents crystallization, SA represents smectic A phase, SB represents smectic B phase, SX represents smectic phase whose phase structure has not been analyzed, N represents nematic phase, I represents isotropic phase, The units of the phase transition temperature are all in °C.

[0204] 1 H-NMR analysis:...

example 1

[0211] 4-Ethoxy-2,3,3'-trifluoro-4'-((propylcyclohexyl)methoxy)biphenyl (1-1-8) was synthesized according to the synthetic scheme shown below.

[0212]

[0213] Synthesis of 1-ethoxy-2,3-difluorobenzene (T-2)

[0214] Add sodium hydroxide in the water (400ml) solution of 2,3-difluorophenol (T-1) (195.0g), bromoethane (196.2g) and tetrabutylammonium bromide (TBAB) (24.2g) (75.9 g), heated and stirred at 80° C. for 6 hours under a nitrogen atmosphere. After the reaction was completed, extraction was performed with heptane, and the organic layer was washed with water and saturated aqueous sodium chloride solution, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure to obtain a black oily substance. The black oil was purified by distillation, whereby 1-ethoxy-2,3-difluorobenzene (T-1) (230.0 g) was obtained as a colorless oil. The yield was 97%.

[0215] Synthesis of 1-ethoxy-2,3-difluorophenylboronic acid (T-3)

[0216] Compound (T-2) (129.5 g) ...

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Abstract

The invention provides a liquid crystal compound having general physical properties necessary for a liquid crystal compound, that is to say, stability to heat, light or the like, a small viscosity, a suitable value of refractive index anisotropy, a suitable value of dielectric anisotropy, steep characteristics electro-optic characteristics, a wide temperature range of a nematic phase and an excellent compatibility with other liquid crystal compounds, and a liquid crystal compounds especially having a wide temperature range of a nematic phase. A compound represented by formula (1). For example, R 1 and R 2 are each independently alkyl having 1 to 9 carbons or alkenyl having 2 to 9 carbons, alkoxy having 1 to 8 carbons or alkenyloxy having 2 to 8 carbons; Q 1 and Q 4 are each independently fluorine or chlorine; Q 2 and Q 3 are each independently hydrogen, fluorine or chlorine, and one of Q 2 and Q 3 is hydrogen; Z is -CH 2 O or -COO-; and h is 1 or 2.

Description

technical field [0001] The present invention relates to a novel liquid crystal compound which can be used as a material for liquid crystal display elements and a liquid crystal composition containing the compound. In detail, the present invention relates to a low viscosity and good compatibility with other liquid crystal compounds, and has a suitable size of refractive index anisotropy and dielectric anisotropy, and can be used in liquid crystal display elements A novel liquid crystal compound for obtaining steep electro-optic properties, a liquid crystal composition containing the compound, and a liquid crystal display device containing the liquid crystal composition. Background technique [0002] Display elements using liquid crystal compounds (in this application, the term liquid crystal compound refers to a general term for compounds that exhibit liquid crystal phases and compounds that do not exhibit liquid crystal phases but are used as constituent components of liqui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C43/225C07C69/753C09K19/12C09K19/14C09K19/16C09K19/18C09K19/20C09K19/30C09K19/32C09K19/34C09K19/54G02F1/13
CPCC09K2019/3425C09K19/3066C09K19/3402C09K2019/0411G02F2001/13712C09K2019/0466C09K19/3068C09K19/42Y10T428/10C09K19/12C09K2019/308C09K2019/0407G02F1/0045C09K2323/00G02F1/13712
Inventor 缟田辉山下淳一
Owner JNC CORP
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