Liquid crystal dielectric applicable to high-frequency electromagnetic wave modulation, and component thereof

Patent metadata

Field	Value
Publication number	US-11345854-B2
Application number	US-201917272416-A
Country	US
Kind code	B2
Filing date	Sep 6, 2019
Priority date	Sep 29, 2018
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

A liquid crystal dielectric applicable to high-frequency electromagnetic wave modulation has a clearing point of the liquid crystal dielectric higher than 110° C., a low-temperature storage temperature lower than −20° C., and an optical anisotropy greater than 0.35. The liquid crystal dielectric includes: one or more compounds selected by general formula I, which occupy 30-80% of the total weight of the liquid crystal dielectric, and one or more compounds selected by general formula II and/or general formula III, which occupy 20-70% of the total weight of the liquid crystal dielectric. The liquid crystal dielectric has good low-temperature stability, high dielectric anisotropy, a high phase width, appropriate rotary viscosity, appropriate optical anisotropy, low dielectric loss, and a low loss tangent, exhibits strong high-frequency electromagnetic wave tuning capability, is specifically suitable for electromagnetic wave modulation in microwave or millimeter wave areas, and has a good application prospect in liquid crystal phase shifters.

First claim

The invention claimed is:

1. A liquid-crystalline medium applicable to high-frequency electromagnetic wave modulation, wherein the liquid-crystalline medium having a clearing point of more than 110° C., a low-temperature storage temperature of below −20° C., and an optical anisotropy of more than 0.35, the liquid-crystalline medium comprising:
one or more compounds selected from the compounds of general Formula I in an amount of 30-80% of the total weight of the liquid-crystalline medium:

one or more compounds selected from the compounds of general Formula II and/or general Formula III in an amount of 20-70% of the total weight of the liquid-crystalline medium:

in which,
R 1 , R 2 , R 3 , R 4 , R 5 , R 6 and R 7 each independently represents C 1-12 alkane group,

one or more than two nonadjacent —CH 2 — in the alkane group can each be independently replaced by —CH═CH—, —C≡C—, —O—, —CO—, —CO—O— or —O—CO—, and one or more —H present in these groups can each be independently substituted by —F or —Cl; and
X 1 , X 2 , X 3 , X 4 and X 5 each independently represents —H, —F or —OCF 3 , and at least two of X 1 , X 2 and X 3 represents —F; and
one or more compounds selected from a group consisting of the following compounds:

in which,
R 81 represents C 4-10 alkane group or alkoxyl group; and
L 1 and L 2 each independently represents —H or —F.

2. A liquid-crystalline medium according to claim 1 , wherein R 1 and R 2 each independently selected from a group consisting of —C 2 H 5 , —C 3 H 7 , —C 4 H 9 and —C 5 H 11 .

3. A liquid-crystalline medium according to claim 1 , wherein the compound of general Formula II is selected from a group consisting of the following compounds:

in which,
R 31 and R 41 each independently represents C 2-6 alkane group,

4. A liquid-crystalline medium according to claim 1 , wherein the compound of general Formula III is selected from a group consisting of the following compounds:

in which,
R 51 and R 61 each independently represents C 2-6 alkane group,

and
R 71 represents C 1-5 alkane group,

5. A liquid-crystalline medium according to claim 1 , wherein the liquid-crystalline medium can further comprise one or more compounds selected from the compounds of general Formula V:

in which,
R 10 and R 11 each independently represents C 1-12 alkane group, alkoxyl group, alkenyl group or alkenyloxy group;
Z 2 represents single bond, —CF 2 O—, —OCF 2 —, —CO—O—, —O—CO— or —CH 2 CH 2 —; and
n represents 0 or 1.

6. A liquid-crystalline medium according to claim 5 , wherein the compound of general Formula V is selected from a group consisting of the following compounds:

wherein R 10 and R 11 each independently represents C1-12 alkane group, alkoxyl group, alkenyl group or alkenyloxy group.

7. A liquid-crystalline medium according to claim 1 , wherein the liquid-crystalline medium further comprises one or more additives.

8. A component for high-frequency technology, comprising the liquid-crystalline medium of claim 1 .

Assignees

• Jiangsu Hecheng Display Tech

Inventors

• Ding Wenquan
• Zhou Zhenting
• Wang Panpan

Classifications

• H01Q3/36

  with variable phase-shifters · CPC title

• C09K19/3059

  in which at least two rings are linked by a carbon chain containing carbon to carbon triple bonds · CPC title

• C09K2019/122

  Ph-Ph · CPC title

• C09K19/10 Primary

  containing at least two benzene rings · CPC title

• C09K19/3458 Primary

  Uncondensed pyrimidines · CPC title