Liquid-crystal medium

Patent metadata

Field	Value
Publication number	US-12305103-B2
Application number	US-202117142835-A
Country	US
Kind code	B2
Filing date	Jan 6, 2021
Priority date	Jan 7, 2020
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

A liquid crystal medium having negative dielectric anisotropy and containing one or more compounds of formulae B and C and one or more compounds of formula G

and the use thereof for an active-matrix display, in particular based on the VA, SA-VA, IPS, PS-IPS, FFS, PS-FFS, UB-FFS or PS-UB-FFS effect.

First claim

The invention claimed is:

1. A liquid crystal (LC) medium having negative dielectric anisotropy and comprising
one or more compounds of formula C1 and one or more compounds of formula G

in which the individual radicals, on each occurrence identically or differently, and each, independently of one another, have the following meanings:

denotes

R 0 , R 1 and R 2 denote a straight chain alkyl or alkoxy radical having 1 to 15 C atoms or a branched alkyl or alkoxy radical having 3 to 15 C atoms, in which one or more CH 2 groups may each be replaced, independently of one another, by

—C≡C-, —CF 2 O-, —OCF 2 -, —CH═CH—, —O—, —CO—O— or —O-CO— in such a way that O atoms are not linked directly to one another, and in which one or more H atoms may be replaced by halogen
X 0 denotes F, CI, CN, SF 5 , SCN, NCS, a halogenated alkyl radical, a halogenated alkenyl radical, a halogenated alkoxy radical or a halogenated alkenyloxy radical having 1 to 6 C atoms, and Z 0 denotes a single bond, —C 2 H 4 -, —CH 2 O-, —CF 2 O-, or —CH═CH-;
and
one or more compounds selected from formulae ZK and DK

in which the individual radicals on each occurrence, identically or differently, have the following meanings:

denotes

denotes

denotes

and
R 3 and R 4 each, independently of one another, denote alkyl having 1 to 12 C atoms, in which one or two non-adjacent CH 2 groups may be replaced by —O—, —CH-CH—, —CO—, —O—CO— or —CO—O— in such a way that O atoms are not linked directly to one another, Z y denotes —CH 2 CH 2 -, —CH═CH—, —CF 2 O-, —OCF 2 -, —CH 2 O—, —OCH 2 -, —COO—, —OCO-, —C 2 F 4 -, —CF═CF— or a single bond, R 5 and R 6 each, independently of one another, denote alkyl having 1 to 12 C atoms, in which one or two non-adjacent CH 2 groups may be replaced by —O—, —CH═CH—, —CO—, —OCO— or —COO— in such a way that O atoms are not linked directly to one another, and e denotes 1 or 2.

2. The LC medium according to claim 1 , further comprising one or more compounds of formula B

in which the individual radicals, on each occurrence identically or differently, and each, independently of one another, have the following meanings:
R 1 , R 2 denote a straight chain alkyl or alkoxy radical having 1 to 15 C atoms or a branched alkyl or alkoxy radical having 3 to 15 C atoms, in which one or more CH 2 groups may each be replaced, independently of one another, by

—C≡C—, —CF 2 O-, —OCF 2 -, —CH═CH—, —O—, —CO—O— or —O-CO— in such a way that O atoms are not linked directly to one another, and in which one or more H atoms may be replaced by halogen,
L 1 , L 2 denote F or Cl, and Y 1 denotes O, S or CH 2 O.

3. The LC medium according to claim 2 , wherein the one or more compounds of formula B are selected from the following formulae

wherein
R 1 and R 2 denote a straight chain alkyl or alkoxy radical having 1 to 15 C atoms or a branched alkyl or alkoxy radical having 3 to 15 C atoms, in which one or more CH 2 groups may each be replaced, independently of one another, by

—C≡C—, —CF 2 O-, —OCF 2 -, —CH═CH—, —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another, and in which one or more H atoms may be replaced by halogen.

4. The LC medium according to claim 1 , which additionally comprises one or more compounds selected from compounds of formula C2

wherein
R 1 and R 2 denote a straight chain alkyl or alkoxy radical having 1 to 15 C atoms or a branched alkyl or alkoxy radical having 3 to 15 C atoms, in which one or more CH 2 groups may each be replaced, independently of one another, by

—C≡C—, —CF 2 O-, —OCF 2 -, —CH═CH—, —O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another, and in which one or more H atoms may be replaced by halogen.

5. The LC medium according to claim 1 , wherein the one or more compounds of formula G are selected from the following formulae

wherein
R 0 denote a straight chain alkyl or alkoxy radical having 1 to 15 C atoms or a branched alkyl or alkoxy radical having 3 to 15 C atoms, in which one or more CH 2 groups may each be replaced, independently of one another, by

—C≡C-, —CF 2 O-, —OCF 2 -, —CH-CH—, —O—, —CO—O— or —O-CO— in such a way that O atoms are not linked directly to one another, and in which one or more H atoms may be replaced by halogen.

6. The LC medium according to claim 1 , which additionally comprises one or more compounds selected from formulae CY and PY:

in which the individual radicals have the following meanings:
a denotes 1 or 2,
b denotes 0 or 1,

denotes

R 1 and R 2 each, independently of one another, denote alkyl having 1 to 12 C atoms, in which one or two non-adjacent CH 2 groups may be replaced by —O—, —CH-CH—, —CO—, —O—CO— or —CO—O— in such a way that O atoms are not linked directly to one another,
Z x and Z y each, independently of one another, denotes —CH═CH—, —CH 2 O-, —OCH 2 -, —CF 2 O-, —OCF 2 -, —O—, —CH 2 -, —CH 2 CH 2 — or a single bond,
L 1-4 each, independently of one another, denote F, Cl, OCF 3 , CF 3 , CH 3 , CH 2 F, or CHF 2 , and
L 5 denotes H or CH 3 .

7. The LC medium according to claim 1 , which comprises one or more compounds selected from formula ZK and one or more compounds selected from formula DK.

8. The

Assignees

• Merck Patent Gmbh

Inventors

• Hirschmann Harald
• Wakaresko Ewgenij

Classifications

• C09K2019/3408

  Five-membered ring with oxygen(s) in fused, bridged or spiro ring systems · CPC title

• C09K2019/3037

  Cy-Cy-C2H4-Ph · CPC title

• C09K2019/3016

  Cy-Ph-Ph · CPC title

• C09K2019/301

  Cy-Cy-Ph · CPC title

• C09K2019/0466

  the linking chain being a -CF2O- chain · CPC title