Liquid-crystalline medium, compounds, and high-frequency components

Patent metadata

Field	Value
Publication number	US-10858587-B2
Application number	US-201715787158-A
Country	US
Kind code	B2
Filing date	Oct 18, 2017
Priority date	Oct 18, 2016
Publication date	Dec 8, 2020
Grant date	Dec 8, 2020

Abstract

Liquid-crystalline media containing one or more compounds of formulae I-1, I-2 and/or I-3

and one or more compounds of formulae II and/or III

and components containing these media for high-frequency technology, in particular phase shifters and microwave array antennas.

First claim

The invention claimed is:

1. A liquid-crystal medium, comprising
one or more compounds of formulae I-1 and I-2 and I-3,
wherein the total concentration of the one or more compounds of formulae I-1 and I-2 and I-3 in the medium is 73% to 100% by weight
and
wherein the concentration of the one or more compounds of formula I-2 in the medium is 25% to 40% by weight, and the concentration of the one or more compounds of formula I-3 in the medium is 45% or more by weight

or
wherein the concentration of the one or more compounds of formula I-3 in the medium is more than 50% by weight

in which
R 1 denotes alkyl having 1 to 7 C atoms or alkenyl having 2 to 7 C atoms,
L 1 denotes H or F,

independently of one another, denote

and
one or more compounds of formulae II and/or III,
wherein the concentration of the one or more compounds of formulae II and/or III is 0% to 27% by weight

in which
R 2 denotes H, alkyl or alkoxy having 1 to 17 C atoms or alkenyl, alkenyloxy or alkoxyalkyl having 2 to 15 C atoms,
z 21 denotes trans-CH═CH—, trans-CF═CF— or —C≡C—

denotes

denotes

R 3 denotes H, alkyl or alkoxy having 1 to 17 C atoms or alkenyl, alkenyloxy or alkoxyalkyl having 2 to 15 C atoms,
one of
Z 31 and Z 32 denotes trans-CH═CH-, trans-CF=CF— or
and the other
one of
Z 31 and Z 32 denotes trans-CH═CH—, trans-CF═CF— or a single bond,

independently of one another, denote

alternatively independently denotes

2. A medium according to claim 1 , which comprises one or more compounds of formulae I-3a to I-3d:

3. A medium according to claim 2 , which comprises one or more compounds of formula I-3c in a total concentration of 30% to 70% by weight.

4. A medium according to claim 1 , which comprises a compound of formula I-1 in a total concentration of 20% or more.

5. A medium according to claim 1 , wherein the one or more compounds of formula I-1 are of formula I-1b

6. A medium according to claim 1 , which additionally comprises one or more chiral compounds.

7. A liquid-crystal medium, comprising one or more compounds of formula I

in which
R 1 denotes H, alkyl or alkoxy having 1 to 17 C atoms or alkenyl, alkenyloxy or alkoxyalkyl having 2 to 15 C atoms,
n=2,
one of

denotes

and the other denotes

independently of one another, denote

wherein the total concentration of the one or more compounds of formula I in the medium is 73% or more by weight.

8. A component for high-frequency technology, which comprises a liquid crystal medium according to claim 1 .

9. A component according to claim 8 , which is suitable for operation in the microwave range.

10. A component according to claim 8 , which is a phase shifter or an LC based antenna element operable in the microwave region.

11. A process for the preparation of a liquid-crystal medium according to claim 1 , comprising mixing together one or more compounds of formulae I-1 and I-2 and I-3, and optionally one or more compounds of formulae II and/or III, and optionally a chiral compound.

12. A microwave antenna array, which comprises one or more components according to claim 8 .

13. A medium according to claim 1 , where the total concentration of the one or more compounds of formulae I-1 and I-2 and I-3 in the medium is 80-90% by weight.

14. A medium according to claim 1 , wherein the concentration of the one or more compounds of formula I-2 in the medium is 25% to 40% by weight, and the concentration of the one or more compounds of formula I-3 in the medium is 45% or more by weight.

15. A medium according to claim 1 , wherein the concentration of the one or more compounds of formula I-3 in the medium is more than 50% by weight.

16. A medium according to claim 7 , where the total concentration of the one or more compounds of formula I in the medium is 80-90% by weight.

17. A component for high-frequency technology, which comprises a liquid crystal medium according to claim 7 .

18. A medium according to claim 1 , which comprises one or more compounds of formulae II and/or III, wherein the concentration of the one or more compounds of formulae II and/or III is 2% to 20% by weight.

19. A liquid-crystal medium according to claim 1 ,
wherein the total concentration of the one or more compounds of formulae I-1 and I-2 and I-3 in the medium is 80% to 100% by weight
and
wherein the concentration of the one or more compounds of formulae II and/or III is 0%
to 20% by weight.

20. A component for high-frequency technology, which comprises a liquid crystal medium according to claim 19 .

Assignees

• Merck Patent Gmbh

Inventors

• Wittek Michael
• Klass Dagmar

Classifications

• H01Q21/0087

  Apparatus or processes specially adapted for manufacturing antenna arrays (manufacturing waveguides H01P11/00) · CPC title

• H01Q3/36

  with variable phase-shifters · CPC title

• C09K19/42

  Mixtures of liquid crystal compounds covered by two or more of the preceding groups C09K19/06 - C09K19/40 · CPC title

• C09K19/3048

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

• C09K19/3028

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