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Liquid crystal composition and liquid crystal display device containing liquid crystal composition

A liquid crystal composition and composition technology, applied in the direction of liquid crystal materials, instruments, chemical instruments and methods, etc., can solve the problems of low temperature storage stability difficulties, long response time, low resistivity, etc.

Inactive Publication Date: 2013-03-27
JIANGSU HECHENG DISPLAY TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the optimization of various performance parameters of mixed liquid crystal materials is contradictory, mutually restrictive and mutually influencing, it is necessary to obtain a wide range of nematic phase, appropriate refractive index anisotropy and dielectric anisotropy, and low temperature storage Stability is more difficult
Among the liquid crystal compositions described in EP0667555, EP0673986, DE19528106, DE19528107, WO962851, significant disadvantages are long response time, low resistivity and high operating voltage
In addition, poor storage stability at low temperature is also a defect of many existing liquid crystal materials.

Method used

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  • Liquid crystal composition and liquid crystal display device containing liquid crystal composition
  • Liquid crystal composition and liquid crystal display device containing liquid crystal composition
  • Liquid crystal composition and liquid crystal display device containing liquid crystal composition

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0077] Preparation of compounds of general formula (I)

[0078] 1) In the solvent tetrahydrofuran, at room temperature, the compound of general formula 1

[0079] (Formula 1)

[0080] with the compound of formula 2

[0081] (Formula 2)

[0082] Under the protection of nitrogen, the catalyst was reacted for 16 hours in the presence of tetrakis (triphenylphosphine) palladium to obtain the compound of general formula 3

[0083] (Formula 3);

[0084] 2) In the solvent tetrahydrofuran, under the protection of nitrogen, at -100 ° C ~ -50 ° C, the compound of the general formula 4

[0085] (Formula 4)

[0086] React with nBuLi to obtain the lithium reagent of general formula 5,

[0087] (Formula 5)

[0088] Then react the lithium reagent with the compound of the general formula 3 to obtain the compound represented by the general formula (I).

[0089] R in the above general formula (general formula 1, general formula 3, general formula 4 and general formula 5) 1 , R...

preparation example

[0091] The synthetic specific process steps of the prepared compound I-8-2 are as follows:

[0092] 1) Synthesis of lithium diisopropylamide (LDA)

[0093] Add 115mL of diisopropylamine and 100mL of tetrahydrofuran (THF) into a 1000mL three-necked flask, under nitrogen protection, add 320mL of n-butyllithium (n-BuLi, 2.4mol / L) dropwise under temperature control at 0°C~-20°C, after dropping, 0 Stir at ~-20°C for 1 hour to prepare LDA.

[0094] 2) Synthesis of trifluorovinyl zinc chloride

[0095]

[0096] Add 53g of anhydrous zinc chloride and 100mL THF to a 1000mL three-necked flask, protect it with nitrogen, cool down to -70°C, inject 54g of 1,1,1,2-tetrafluoroethane gas, and control the temperature from -50°C to -70°C Slowly inject LDA under the liquid surface through the needle tube, and stir for 2 hours after the addition, to obtain trifluorovinyl zinc chloride.

[0097] 3) Synthetic compound of formula 6

[0098] (Formula 6)

[0099] (Formula 7)

[0100] The co...

Embodiment 1

[0124] Prepare the liquid crystal composition of the present invention by each compound listed in Table 3 and the weight percentage, it is filled between the two substrates of the liquid crystal display for performance testing, and the test data are shown in the following table:

[0125] Table 3 liquid crystal composition formula and test performance thereof

[0126]

[0127] By comparing Example 1 and Comparative Example 1, it can be seen that the composition provided by the present invention has suitably high optical anisotropy, high dielectric anisotropy, superior power saving performance and lower viscosity, thereby being able to achieve Fast response time. Therefore, it is suitable for outdoor equipment and low temperature environment.

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Abstract

The invention provides a liquid crystal composition and application thereof. The liquid crystal composition comprises the following components in percentage by weight: 1 to 40 percent of a compound with the general formula (I), 1 to 60 percent of a compound with the general formula (II), 1 to 50 percent of a compound with the general formula (III), and 1 to 30 percent of a compound with the general formula (IV). The liquid crystal composition is high in response speed and excellent in low-temperature storage stability, and is applicable to high optical anisotropy. The liquid crystal composition is used in a liquid crystal element, has good image displaying effect, and does not have the phenomenon of image tails. The voltage has small changes along with temperature, and quick response at a low temperature.

Description

technical field [0001] The invention relates to a liquid crystal composition, in particular to a liquid crystal composition with fast response speed, good low-temperature storage stability and appropriate high optical anisotropy and its application. Background technique [0002] Liquid crystal material is a mixture of organic rod-shaped small molecular compounds that have both fluidity of liquid and anisotropy of crystal at a certain temperature. Because of the characteristics of optical anisotropy and dielectric anisotropy, liquid crystal materials are widely used in liquid crystal display components of electronic calculators, automobile instruments, televisions, computers and other devices. According to the classification of liquid crystal display, the liquid crystal composition can be divided into twisted nematic type (TN type), super twisted nematic type (STN type), thin film transistor type (TFT type), guest-host type (GH type), dynamic scattering type ( DS type) and o...

Claims

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Application Information

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IPC IPC(8): C09K19/46C09K19/30C09K19/32G02F1/1333
Inventor 胡娟韩文明吴凤殷海涛丁文全
Owner JIANGSU HECHENG DISPLAY TECHCO
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