Liquid-crystal medium

Patent metadata

Field	Value
Publication number	US-10519375-B2
Application number	US-201615571988-A
Country	US
Kind code	B2
Filing date	Apr 8, 2016
Priority date	May 4, 2015
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

The invention relates to a liquid-crystalline medium which comprises at least one compound of the formula I,

in which
R 1 and R 1 * each, independently of one another, denote an alkyl or alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH 2 groups in these radicals may each be replaced, independently of one another, by

in such a way that O atoms are not linked directly to one another, and in which, in addition, one or more H atoms may be replaced by halogen,
A 1 denotes

L 1 denotes F, Cl, CF 3 , OCF 3 or CHF 2 ,

and to the use thereof for electro-optical purposes, in particular for shutter glasses, 3D applications, in TN, PS-TN, STN, TN-TFT, OCB, IPS, PS-IPS, FFS, PS-FFS and PS-VA-IPS displays.

First claim

The invention claimed is:

1. A liquid-crystalline medium, comprising at least one compound of formula I,

in which
R 1 and R 1 * each, independently of one another, denote an alkyl or alkoxy radical having 1 to 15 C atoms, in which one or more CH 2 groups are optionally each replaced, independently of one another, by

 in such a way that O atoms are not linked directly to one another, and in which optionally one or more H atoms are replaced by halogen,
A 1 denotes

L 1 denotes F, Cl, CF 3 , OCF 3 or CHF 2 .

2. A liquid-crystalline medium, comprising at least one compound of formulae I-1 to I-10,

in which
A 1 denotes

L 1 denotes F, Cl, CF 3 , OCF 3 or CHF 2 ,
alkyl and alkyl* each, independently of one another, denote a straight-chain alkyl radical having 1-6 C atoms,
alkenyl and alkenyl* each, independently of one another, denote a straight-chain alkenyl radical having 2-6 C atoms, and
alkoxy and alkoxy* each, independently of one another, denote a straight-chain alkoxy radical having 1-6 C atoms.

3. The liquid-crystalline medium according to claim 1 , which additionally comprises one or more compounds of formulae II and/or III,

in which
R 0 denotes a halogenated or unsubstituted alkyl or alkoxy radical having 1 to 15 C atoms, in which one or more CH 2 groups are optionally each replaced, independently of one another, by

 in such a way that O atoms are not linked directly to one another,
X 0 denotes F, Cl, CN, SF 5 , SCN, NCS, a halogenated alkyl radical, a halogenated alkenyl radical, a halogenated alkoxy radical or a halogenated alkenyloxy radical having up to 6 C atoms,
Y 1-6 each, independently of one another, denote H, F or Cl,

 each, independently of one another, denote

4. The liquid-crystalline medium according to claim 1 , which additionally comprises one or more compounds of formulae IX to XII,

in which
X 0 denotes F, Cl, CN, SF 5 , SCN, NCS, a halogenated alkyl radical, a halogenated alkenyl radical, a halogenated alkoxy radical or a halogenated alkenyloxy radical having up to 6 C atoms,
L denotes H or F,
“alkyl” denotes C 1-6 -alkyl,
R′ denotes C 1-6 -alkyl, C 1-6 -alkoxy or C 2-6 -alkenyl, and
“alkenyl” and “alkenyl*” each, independently of one another, denote C 2-6 -alkenyl.

5. The liquid-crystalline medium according to claim 1 , which additionally comprises one or more compounds of formula XIII,

in which
R 1 and R 2 each, independently of one another, denote n-alkyl, alkoxy, oxaalkyl, fluoroalkyl or alkenyl, each having up to 6 C atoms.

6. The liquid-crystalline medium according to claim 1 , which additionally comprises one or more compounds of formula XVII,

in which
R 1 and R 2 each, independently of one another, denote n-alkyl, alkoxy, oxaalkyl, fluoroalkyl or alkenyl, each having up to 8 C atoms, and
L denotes H or F.

7. The liquid-crystalline medium according to claim 1 , which additionally comprises one or more compounds of formulae XXVII, XXVIII and/or XXIX,

in which
R 0 denotes a halogenated or unsubstituted alkyl or alkoxy radical having 1 to 15 C atoms, in which one or more CH 2 groups are optionally each replaced, independently of one another, by

 in such a way that O atoms are not linked directly to one another, and
X 0 denotes F, Cl, CN, SF 5 , SCN, NCS, a halogenated alkyl radical, a halogenated alkenyl radical, a halogenated alkoxy radical or a halogenated alkenyloxy radical having up to 6 C atoms.

8. The liquid-crystalline medium according to claim 1 , which additionally comprises one or more compounds of formulae XIX, XX, XXI, XXII, XXIII and/or XXIV,

in which
R 0 denotes a halogenated or unsubstituted alkyl or alkoxy radical having 1 to 15 C atoms, in which one or more CH 2 groups are optionally each replaced, independently of one another, by

 in such a way
that O atoms are not linked directly to one another,
X 0 denotes F, Cl, CN, SF 5 , SCN, NCS, a halogenated alkyl radical, a halogenated alkenyl radical, a halogenated alkoxy radical or a halogenated alkenyloxy radical having up to 6 C atoms, and
Y 1-4 each, independently of one another, denote H or F.

9. The liquid-crystalline medium according to claim 1 , which additionally comprises one or more additive(s) selected from the group consisting of UV stabilisers, dopants and antioxidants.

10. The liquid-crystalline medium according to claim 1 , which additionally comprises one or more polymerisable compounds.

11. A process for preparing the liquid-crystalline medium according to claim 1 , comprising mixing one or more compounds of formula I with further liquid-crystalline compounds and optionally also with one or more additives and/or at least one polymerisable compound.

12. An electro-optical device, comprising the liquid-crystalline medium according to claim 1 .

13. The electro-optical device according to claim 12 , which is selected from the group consisting of shutter glasses, 3D applications, TN, PS-TN, STN, TN-TFT, OCB, IPS, PS-IPS, FFS, PS-FFS and PS-VA-IPS displays.

14. An electro-optical liquid-crystal display containing a liquid-crystalline medium according to claim 1 .

15. The liquid-crystalline medium according to claim 1 , wherein
A 1 denotes

16. The liquid-crystalline medium according to claim 1 , wherein
A 1 denotes

17. The liquid-crystalline medium according to claim 1 , wherein
A 1 denotes

Assignees

• Merck Patent Gmbh

Inventors

• Haensel Helmut
• Pohle Andreas
• Schuler Brigitte
• Jasper Christian

Classifications

• C09K19/067

  containing one heterocyclic ring having nitrogen as heteroatom · CPC title

• C09K2019/3042

  Cy-Cy-C2H4-Ph-Ph · CPC title

• C09K2019/3019

  Cy-Cy-Ph-Ph · CPC title

• C09K2019/3012

  Cy-Cy-Cy-Ph, or more Cy rings · CPC title

• C09K2019/124

  Ph-Ph-Ph-Ph · CPC title