Liquid-crystalline medium

Patent metadata

Field	Value
Publication number	US-11932797-B2
Application number	US-202117161964-A
Country	US
Kind code	B2
Filing date	Jan 29, 2021
Priority date	Nov 24, 2017
Publication date	Mar 19, 2024
Grant date	Mar 19, 2024

Abstract

A liquid-crystalline medium which comprises at least one compound selected from the group of compounds of the formulae IA to IH,

in which
Z 1 denotes a single bond, —CH 2 CH 2 —, —CH═CH—, —CH 2 O—, —OCH 2 —, —CF 2 O—, —OCF 2 —, —COO—, —OCO—, —C 2 F 4 —, —(CH 2 ) 4 —, —CHFCHF—, —CF 2 CH 2 —, —CH 2 CF 2 —, —C≡C—, —CF═CF—, —CH═CHCHO— or —CH 2 CF 2 O—,

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

First claim

The invention claimed is:

1. A liquid-crystalline medium comprising:
at least one compound selected from the group of the compounds of the formulae IA and IB,

in which
Z 1 denotes a single bond;
and at least one compound selected from formula B(S)-5cy1O-O2:

wherein the medium has a negative dielectric anisotropy, Δε.

2. The liquid-crystalline medium according to claim 1 , which comprises at least one compound of at least one of the following formulae:

3. The liquid-crystalline medium according to claim 1 , wherein the proportion of the compound(s) of the formulae IA and IB in the medium as a whole is 1-50% by weight.

4. The liquid-crystalline medium according to claim 1 , which additionally comprises one or more compounds selected from the group of the compounds of the formulae IIA, IIB and IIC,

in which
R 2A , R 2B and R 2C each, independently of one another, denote H, an alkyl having 1 to 15 C atoms or alkenyl radical having 2 to 15 C atoms which is unsubstituted, monosubstituted by CN or CF 3 or at least monosubstituted by halogen, where, in addition, one or more CH 2 groups in these radicals may each be replaced by —O—, —S—,

—C≡C, —CF 2 O—, —OCF 2 —, —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another, a cyclopropyl ring, cyclobutyl ring or cyclopentyl ring,
L 1-4 each, independently of one another, denote F, Cl, CF 3 or CHF 2 ,
Z 2 and Z 2′ each, independently of one another, denote a single bond, —CH 2 CH 2 —, —CH═CH—, —OCF 2 —, —CH 2 O—, —OCH 2 —, —COO—, —OCO—, —C 2 F 4 —, —CF═CF—, —C≡C— or —CH═CHCH 2 O—,
p denotes 0, 1 or 2,
q denotes 0 or 1, and
v denotes 1 to 6.

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

in which
R 3 and R 32 each, independently of one another, denote a straight-chain alkyl having 1 to 12 C atoms, alkenyl having 2 to 12 C atoms, alkoxy having 1 to 12 C atoms, alkoxyalkyl having 2 to 12 C atoms, or alkenyloxy radical having 2 to 12 C atoms,

and
Z 3 denotes a single bond, —CH 2 CH 2 —, —CH═CH—, —CF 2 O—, —OCF 2 —, —CH 2 O—, —OCH 2 —, —COO—, —OCO—, —C 2 F 4 —, —C 4 H 9 —, —C≡C— or —CF═CF—.

6. The liquid-crystalline medium according to claim 1 , wherein the medium additionally comprises one or more compounds of the formulae L-1 to L-11,

in which
R, R 1 and R 2 each, independently of one another, denote H, an alkyl having 1 to 15 C atoms or alkenyl radical having 2 to 15 C atoms which is unsubstituted, monosubstituted by CN or CF 3 or at least monosubstituted by halogen, where, in addition, one or more CH 2 groups in these radicals may each be replaced by —O—, —S—,

—C≡C—, —CF 2 O—, —OCF 2 —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another, a cyclopropyl ring, cyclobutyl ring or cyclopentyl ring,
alkyl denotes an alkyl radical having 1-6 C atoms, and
s denotes 1 or 2.

7. The liquid-crystalline medium according to claim 1 , wherein the medium additionally comprises one or more terphenyls of the formulae T-1 to T-22,

in which
R denotes a straight-chain alkyl or alkoxy radical having 1-7 C atoms,
m denotes 0, 1, 2, 3, 4, 5 or 6, and
n denotes 0, 1, 2, 3 or 4.

8. The liquid-crystalline medium according to claim 1 , wherein the medium additionally comprises one or more compounds of the formulae O-1 to O-17,

in which
R 1 and R 2 each, independently of one another, denote H, an alkyl having 1 to 15 C atoms or alkenyl radical having 2 to 15 C atoms which is unsubstituted, monosubstituted by CN or CF 3 or at least monosubstituted by halogen, where, in addition, one or more CH 2 groups in these radicals may each be replaced by —O—, —S—,

—C≡C—, —CF 2 O—, —OCF 2 —, OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another, a cyclopropyl ring, cyclobutyl ring or cyclopentyl ring.

9. The liquid-crystalline medium according to claim 1 , wherein the medium additionally comprises one or more compounds selected from the group of the compounds of the formulae BC, CR, PH-1 and PH-2,

in which
R B1 , R B2 , R CR1 , R CR2 , R 1 , R 2 each independently of one another, denote H, an alkyl having 1 to 15 C atoms or alkenyl radical having 2 to 15 C atoms which is unsubstituted, monosubstituted by CN or CF 3 or at least monosubstituted by halogen, where, in addition, one or more CH 2 groups in these radicals may each be replaced by —O—, —S—,

—C≡C—, —CF 2 O—, —OCF 2 —, —OC—O— or —O—CO— in such a way that O atoms are not linked directly to one another, a cyclopropyl ring, cyclobutyl ring or cyclopentyl ring, and
c denotes 0, 1 or 2.

10. The liquid-crystalline medium according to claim 1 , wherein the medium additionally comprises one or more compounds of the following formulae:

11. The liquid-crystalline medium according to claim 1 , wherein the medium comprises 5-60% of the compound of the following formula:

12. The liquid-crystalline medium according to claim 1 , wherein the medium additionally comprises one or more compounds selected from the group of the compounds of the formulae P-1 to P-5,

in which
R denotes straight-cha

Assignees

• Merck Patent Gmbh

Inventors

• Hirschmann Harald
• Bauer Monika
• Windhorst Martina
• Reuter Marcus
• Weiss Kristin

Classifications

• C09K2019/305

  Cy-CH=CH-Cy · CPC title

• C09K2019/303

  Cy-C2H4-Cy · CPC title

• C09K2019/3077

  Cy-Cy-COO-Ph · CPC title

• C09K2019/123

  Ph-Ph-Ph · CPC title

• C09K19/3098

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