Nematic phase liquid crystal composition

A technology of liquid crystal composition and nematic phase, which is applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve the problems of poor low temperature performance, difficult synthesis, and few compounds, and achieve improved frequency dependence, increased charge retention rate, Effect of improving temperature dependence

Inactive Publication Date: 2009-01-07
JIANGSU HECHENG DISPLAY TECHCO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] (3) The birefringence (Δn) of pyrimidine liquid crystals is large, the viscosity is large, and the low temperature performance is not good;
[0006] (4) There are many types of ester monomers, which can be combined according to different needs, but the disadvantage is that the viscosity is high
[0017] However,

Method used

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  • Nematic phase liquid crystal composition
  • Nematic phase liquid crystal composition
  • Nematic phase liquid crystal composition

Examples

Experimental program
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Example Embodiment

[0070] Example 1: Preparation of Compounds of Formula (e) as Class I Compounds and Compounds of Formula (f) as Compounds of II Compounds

[0071] Taking the compound of formula (a) as a raw material, the compound of formula (e) is obtained through the following chemical reaction, and the compound of formula (f) is further obtained from formula (e):

[0072]

[0073] The preparation process is as follows:

[0074] Among them, the raw material (a) can be synthesized by a known method or directly purchased in the market.

[0075] Synthesis of the compound of formula (b): add 262 g of chloromethyl ether ammonium salt and 600 ml of THF into a 2L three-necked flask, under nitrogen protection, add 86 g of potassium tert-butoxide in batches, and stir until the reaction solution becomes dark red. After stirring for 30 min, the mixed solution of (a) 127.5 g / THF 200 ml was slowly added dropwise, and the mixture was stirred at room temperature for more than 4 hours. After separating ...

Example Embodiment

[0101] Example 2

[0102]

[0103]

Example Embodiment

[0106] Example 3

[0107]

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Abstract

The invention relates to a nematic liquid crystal combination used for TN, STN, TFT displaying devices, which comprises one of a general formula (I) or / and (II) or a plurality of bicyclo system derivatives. X' is selected from F and Cl, and F is optimized. Ra, Rb, Ra' and Rb' are respectively and independently selected from alkyl, alkoxy, alkenyl, alkenoxy, fluoroalkyl, fluoroalkoxy, fluoroalkenyl or fluoroalkenoxy. The combination is characterized in that difluoro chain hydrocarbon derivatives are used for various displays to result in the lowered low temperature FNP and increased low temperature stability of the combination. Especially under low temperature, the responding time is very fast. In STN displaying, the gradient performance can be improved, and the information capacity of the display can be improved. In the displaying of TN caproic TN type TFT, the gray scale display can be improved and the color expression ability can be enriched.

Description

technical field [0001] The present invention relates to liquid crystal compositions, especially nematic liquid crystal compositions, as liquid crystal materials. Background technique [0002] Currently, liquid crystal displays are widely used, and liquid crystal materials are developing rapidly, especially nematic liquid crystal materials are developing the fastest. Nematic twisted nematic (TN for short) displays are known from M. Helfrich, Appl. Phys. Lett., 18, 127 (1971). In the TN display mode, the manufacturing process of TN displays is relatively simple, the process control is relatively easy, and the selection of liquid crystal materials is relatively wide and common. The types of liquid crystals used in the TN display mode include esters, biphenylnitriles, pyrimidines, dioxanes, cyclohexylbiphenyls, and the like. Various types of liquid crystal monomers have the following performance characteristics: [0003] (1), biphenyl liquid crystal: low viscosity, large bire...

Claims

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Application Information

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IPC IPC(8): C09K19/30C09K19/08
Inventor 靳灿辉谭玉东张宏伟朱霞宋小龙王艳伟孙仲猛吴凤
Owner JIANGSU HECHENG DISPLAY TECHCO
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