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Liquid crystal compound and liquid crystal medium containing liquid crystal compound

A liquid crystal compound and liquid crystal medium technology, applied in liquid crystal materials, organic chemistry, chemical instruments and methods, etc., can solve the problems of low contrast, narrow viewing angle, and small wavelength dependence of birefringent liquid crystal layer, and achieve a large K value. , the effect of low rotational viscosity

Inactive Publication Date: 2015-05-06
SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Most of the current liquid crystal display elements are twisted nematic (TN) mode, but it has the disadvantages of low contrast and narrow viewing angle, while the display of vertical alignment (VA) mode is characterized by its wide viewing angle, high contrast and no need for rubbing alignment, etc. Advantages, it has been widely used and has become a common display mode for large-size TV TFT-LCDs. In addition, the contrast displayed in VA mode is less dependent on the birefringence of liquid crystals, the thickness of the liquid crystal layer, and the wavelength of incident light. Therefore, , VA mode has become a very promising liquid crystal display technology

Method used

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  • Liquid crystal compound and liquid crystal medium containing liquid crystal compound
  • Liquid crystal compound and liquid crystal medium containing liquid crystal compound
  • Liquid crystal compound and liquid crystal medium containing liquid crystal compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078]

[0079] step 1

[0080]

[0081] Dissolve 16.7g (0.05mol) (1-b) in 150ml ether, add 0.06mol of cyclopropylmagnesium bromide dropwise at below 0°C, hydrolyze with ammonium chloride aqueous solution for 1 hour, extract, pass through a silica gel column, and weigh Purified by crystallization to obtain 8.2 g of (1-c).

[0082] step 2

[0083]

[0084] (1-c) 8.2g (0.022mol) was dissolved in 50ml of dichloromethane, 0.05mol triethylsilane and 0.05mol boron trifluoride ether were added dropwise at -70°C, the temperature was raised to 0°C, and conventional treatment gave 6.8 g(1-a). Gc: 99.9%

[0085] The same synthetic method, obtain the following liquid crystal compound

[0086]

Embodiment 2

[0088]

[0089] step 1

[0090]

[0091] Dissolve 18.1g (0.05mol) (2-b) in 150ml ether, add 0.06mol cyclopropylmagnesium bromide dropwise at below 0°C, hydrolyze with ammonium chloride aqueous solution for 1 hour after adding, extract, pass through a silica gel column, and weigh Purification by crystallization gave (2-c) 14g.

[0092] step 2

[0093]

[0094] (2-c) 14g (0.035mol) was dissolved in 150ml of dichloromethane, 0.07mol triethylsilane and 0.07mol boron trifluoride ether were added dropwise at -70°C, the temperature was raised to 0°C, and 9.5g was obtained (2-a). Gc: 99.91%

[0095] The same synthetic method, obtain the following liquid crystal compound

[0096]

[0097]

Embodiment 3

[0099]

[0100] Dissolve 18.4g (0.1mol) (3-b) in 100ml THF, add 0.11mol butyllithium dropwise at -70°C in a nitrogen atmosphere, and then add 0.105mol 4-propylbicyclic ketone dropwise after the addition is complete. Rising to room temperature, conventional processing, to obtain (3-a) 31g, Gc: 99.91%

[0101] The component distribution ratio and performance parameters of the liquid crystal composition of Table 1 Example 4

[0102]

[0103]

[0104] The component ratio of the liquid crystal composition of table 2 embodiment 5 and performance parameter thereof

[0105]

[0106]

[0107] The component distribution ratio and performance parameters of the liquid crystal composition of Table 3 Example 6

[0108]

[0109]

[0110] The component ratio of the liquid crystal composition of Table 4 Example 7 and its performance parameters

[0111]

[0112]

[0113] The formula of liquid crystal composition of table 5 embodiment 8 and test performance parameter t...

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Abstract

The invention discloses a negative dielectric anisotropy liquid crystal monomer represented by a general formula I and liquid crystal medium containing such monomers. The liquid crystal medium includes one or more types of compounds represented by the general formula I and one or more types of compounds represented by a general formula II. The liquid crystal composition provided by the invention is excellent in performance, has proper negative dielectric anisotropy, proper optical anisotropy, and a relatively large K value, and can be used for active matrix display elements containing the liquid crystal medium, such as active matrix displays with an ECB, FFS or IPS, MVA, PVA or HVA effect. (The general formulas I and II are shown in the description.

Description

technical field [0001] The present invention relates to the field of liquid crystal materials, and specifically relates to a liquid crystal medium, which is a liquid crystal medium with negative dielectric anisotropy. The present invention also relates to the use of the liquid crystal medium in active matrix display elements, such as using ECB, FFS or Applications in active matrix displays with IPS, MVA, PVA or HVA effects. technical background [0002] At present, TFT-LCD has been widely used in industrial fields and household consumption fields, almost completely replacing the traditional CRT display market. According to different liquid crystal display methods, liquid crystal display elements can be divided into twisted nematic (TN) mode, super twisted nematic (STN) mode, in-plane (IPS) mode, vertical alignment (VA) mode and other modes. Regardless of the display mode, the liquid crystal composition needs to have the following characteristics: [0003] (1) Chemical and ...

Claims

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Application Information

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IPC IPC(8): C07C43/225C09K19/30C09K19/44C09K19/42G02F1/1333
CPCC07C43/225C07C2601/02C07C2601/16C07C2602/14C09K19/3003C09K19/3066C09K19/42C09K19/44C09K2019/3012C09K2019/303G02F1/1333
Inventor 翟媛媛员国良温刚丰景义高红茹贾鹏忠孙轩非
Owner SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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