Liquid-crystalline medium

Patent metadata

Field	Value
Publication number	US-9714381-B2
Application number	US-201514826346-A
Country	US
Kind code	B2
Filing date	Aug 14, 2015
Priority date	Aug 15, 2014
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

The invention relates to a liquid-crystalline medium based on a mixture of polar compounds which contains
at least one compound of the formula I,

and
at least one additional compound, and to the use of the LC mixtures for an active- or passive matrix addressed displays, in particular based on the VA, PSA, PS-VA, IPS, FFS, PS-IPS, PS-FFS technology, preferably in optical displays for the self-aligning VA mode.

First claim

The invention claimed is:

1. A liquid-crystalline medium comprising a mixture of polar compounds, including in said mixture
at least one compound of formula I,

in which
R 1 denotes 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 —C≡C—, —CF 2 O—, —CH═CH—,

—O—, —CO—O—, —O—CO— 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,
L 1 , L 2 and L 3 each, independently of one another, denote H, F, Cl, CF 3 , CHF 2 or alkyl with 1-5 carbon atoms, preferably F or alkyl, and
m denotes 0, 1, 2, 3, 4, 5 or 6,
and
at least one compound of the formulae I-A, I-B, I-G OR I-J,

in which
R 1 * and R 2 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 —C≡C—, —CF 2 O—, —CH═CH—,

—O—, —CO—O—, —O—CO— 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 0 or 1, and
L 1 and L 2 each, independently of one another, denote H, F, Cl, CF 3 or CHF 2 .

2. The liquid-crystalline medium according to claim 1 , comprising one or more compounds of formulae I-1 to I-36,

3. The liquid-crystalline medium according to claim 1 , comprising one or more compounds of formulae I-1a, I-2a or I-2b,

in which
alkyl denotes a straight-chain alkyl radical having 1 to 7 carbon atoms.

4. The liquid-crystalline medium according to claim 1 , comprising one or more compounds of formulae I-A-1 to I-K-1,

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

5. The liquid-crystalline medium according to claim 1 , additionally comprising one or more compounds of the formulae IIA to IIC,

in which
R 2A , R 2B and R 2C each, independently of one another, denote H, an alkyl or alkenyl radical having up 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 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,
L 1-4 each, independently of one another, denote F or Cl,
Z 2 and Z 2′ each, independently of one another, denote 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 —, —CF═CF—, —CH═CHCH 2 O—,
p denotes 1 or 2,
q denotes 0 or 1, and
v denotes 1 to 6.

6. The liquid-crystalline medium according to claim 1 , additionally comprising one or more compounds of formula III,

in which
R 31 and R 32 each, independently of one another, denote a straight-chain alkyl, alkoxyalkyl, alkenyl, or alkoxy radical having up to 12 C atoms, and

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 —, —CF═CF—.

7. The liquid-crystalline medium according to claim 1 , additionally comprising 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 or alkenyl radical having up 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 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,
and alkyl denotes an alkyl radical having 1-6 C atoms, and
s denotes 1 or 2.

8. The liquid-crystalline medium according to claim 1 , additionally comprising one or more compounds of formulae T-1 to T-21,

in which
R denotes a straight-chain alkyl or alkoxy radical having 1-7 C atoms, and
m denotes 1-6.

9. The liquid-crystalline medium according to claim 1 , additionally comprising one or more compounds of formulae O-1 to O-11,

in which
R 1 and R 2 each, independently of one another, denote H, an alkyl or alkenyl radical having up 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 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.

10. The liquid-crystalline medium according to claim 1 , wherein the mixture contains 0.01 to 10% by weight of the compound of the formula I based on the mixture as a whole.

11. The liquid-crystalline medium according to claim 1 additionally comprising one or more additives.

12. The liquid-crystalline medium according to claim 1 , comprising an additive that is an antioxidant, stabilizer, reactive mesogen, dopant, microparticle, nanoparticle or dyes.

Assignees

• Merck Patent Gmbh

Inventors

• Archetti Graziano
• Klasen-Memmer Melanie
• Fortte Rocco
• Schoen Sabine

Classifications

• C09K19/54

  Additives having no specific mesophase {characterised by their chemical composition} · CPC title

• C09K2019/3009

  Cy-Ph · CPC title

• C09K2019/0444

  characterized by a linking chain between rings or ring systems, a bridging chain between extensive mesogenic moieties or an end chain group · CPC title

• C09K2019/3025

  Cy-Ph-Ph-Ph · CPC title

• C09K2019/3021

  Cy-Ph-Ph-Cy · CPC title