Liquid-crystalline medium and electro-optical display

Patent metadata

Field	Value
Publication number	US-9434882-B2
Application number	US-201113991631-A
Country	US
Kind code	B2
Filing date	Nov 8, 2011
Priority date	Dec 7, 2010
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

The invention relates to a liquid-crystalline medium having a nematic phase and negative dielectric anisotropy which comprises a) a compound of the formula (I), b) one or more compounds of the formula (II) and c) one or more compounds selected from the group of the compounds of the formulae (III-1) to (III-4. The liquid-crystalline medium is useful in an electro-optical display, particularly in an active-matrix display based on the VA, ECB, PALC, FFS or IPS effect.

First claim

The invention claimed is:

1. A liquid-crystalline-medium having a nematic phase and negative dielectric anisotropy which comprises
a) a compound of the formula I

and
b) one or more compounds of the formula II

in which
R 21 denotes an unsubstituted alkyl radical having 1 to 7 C atoms or an unsubstituted alkenyl radical having 2 to 7 C atoms, and
R 22 denotes an unsubstituted alkenyl radical having 2 to 7 C atoms, wherein said formula II includes 37% or more of a compound of formula CC-n-V

in which n is 3 or,
wherein the total concentration of the compounds of the formula CC-n-V, in the medium as a whole is 37% to 44%
and
c) one or more compounds of the formula III-1 to III-4

in which
R 31 denotes an unsubstituted alkyl radical having 1 to 7 C atoms,
R 32 denotes an unsubstituted alkyl radical having 1 to 7 C atoms, or an unsubstituted alkoxy radical having 1 to 6 C atoms, and
m, n and o each, independently of one another, denote 0 or 1 and
wherein at least one of said compounds is a compound of formula III-2.

2. A medium according to claim 1 , which comprises one compounds of the formula II, as indicated in claim 1 , in which R 22 vinyl.

3. A medium according to claim 2 , which comprises a compound of the formula II, in which R 21 denotes n-propyl and R 22 denotes vinyl.

4. A medium according to claim 1 , wherein the one or more compound of formula III-2 is of the formula III-2-2

wherein
R 31 denotes an alkyl radical having 2 to 5 C atoms, preferably having 3 to 5 C atoms, and
R 32 denotes an alkyl or alkoxy radical having 2 to 5 C atoms, preferably an alkoxy radical having 2 to 4 C atoms, or an alkenyloxy radical having 2 to 4 C atoms.

5. A medium according to claim 1 , further comprising one or more compound of the formula III-3-2

in which
R 31 denotes an unsubstituted alkyl radical having 1 to 7 C atoms,
R 32 denotes an unsubstituted alkyl radical having 1 to 7 C atoms, or an unsubstituted alkoxy radical having 1 to 6 C atoms.

6. A medium according to claim 1 , further comprising one or more compounds of the formula III-4,

in which
R 31 denotes an unsubstituted alkyl radical having 1 to 7 C atoms,
R 32 denotes an unsubstituted alkyl radical having 1 to 7 C atoms, or an unsubstituted alkoxy radical having 1 to 6 C atoms.

7. A medium according to claim 1 , additionally comprising one or more chiral compounds.

8. An electro-optical display or electro-optical component that contains a liquid-crystalline medium according to claim 1 .

9. A display according to claim 8 , wherein said display comprises the VA (vertically aligned) or ECB (electrically controlled birefringence) effect.

10. A display according to claim 8 , wherein said display comprises an active-matrix addressing device.

11. A process for the preparation of a liquid-crystalline according to claim 1 , wherein the compound of formula I is mixed with a compound of formula CC-3-V and one or more compounds of the formula III-2.

12. A process for the stabilisation of a liquid-crystalline according to claim 1 wherein said medium further comprising one or more compound that is

13. The medium according to claim 1 , comprising up to 42% or less of CC-3-V.

14. The medium according to claim 1 , further comprising one or more compounds of formula II-2

in which
alkenyl denotes an alkenyl radical having 2 to 5 C atoms,
alkenyl′ denotes an alkenyl radical having 2 to 5 C atoms.

15. The medium according to claim 1 , further comprising a compound that is

16. The medium according to claim 1 , further comprising one or more compounds of the formula III-1-1 and/or III-1-2

in which
R 31 denotes an alkyl radical having 2 to 5 C atoms, and
R 32 denotes an alkyl or alkoxy radical having 2 to 5 C atoms.

17. The medium according to claim 1 , further comprising one or more compounds of the formula IV-1 and/or IV-2,

in which
alkyl and alkyl′, independently of one another, denote alkyl having 1 to 7 C atoms,
alkoxy denotes alkoxy having 1 to 5 C atoms, and
alkenyl and alkenyl′, independently of one another, denote alkenyl having 2 to 7 C atoms.

18. The medium according to claim 1 , further comprising a compound of the formula

in which
n=2 and
m=3.

19. The liquid-crystalline-medium according to claim 1 , further comprising
c) one or more compounds of the formula III-1, III-3 or III-4

in which
R 31 denotes an unsubstituted alkyl radical having 1 to 7 C atoms,
R 32 denotes an unsubstituted alkyl radical having 1 to 7 C atoms, or an unsubstituted alkoxy radical having 1 to 6 C atoms, and
m, and o each, independently of one another, denote 0 or 1.

20. An electro-optical display or electro-optical component that contains a liquid-crystalline medium according to claim 4 .

21. An electro-optical display or electro-optical component that contains a liquid-crystalline medium according to claim 5 .

22. An electro-optical display or electro-optical component that contains a liquid-crystalline medium according to claim 6 .

23. A process for the preparation of a liquid-crystalline medium according to claim 4 , wherein the compound of formula I is mixed with a compound of formula CC-3-V and one or more compounds of the formula III-2.

24. A process for the preparation of a liquid-crystalline medium according to claim 5 , wherein the compound of formula I is mixed with a compound of formula CC-3-V and one or more compounds of the formula III-2.

25. A process for the preparation of a liquid-crystalline medium according to claim 6 , wherein the compound of formula I is mixed with a compound of formula CC-3-V and one or more compounds of the formula III-2.

26. A process for the stabi

Assignees

• Goebel Mark
• Manabe Atsutaka
• Montenegro Elvira
• Pauluth Detlef
• Merck Patent Gmbh

Inventors

• Goebel Mark
• Manabe Atsutaka
• Montenegro Elvira
• Pauluth Detlef

Classifications

• C09K2019/301

  Cy-Cy-Ph · CPC title

• C09K2019/3009

  Cy-Ph · CPC title

• C09K19/3098

  Unsaturated non-aromatic rings, e.g. cyclohexene rings · CPC title

• C09K2019/3016

  Cy-Ph-Ph · CPC title

• C09K2019/123

  Ph-Ph-Ph · CPC title