Liquid-crystalline medium

Patent metadata

Field	Value
Publication number	US-2016208170-A1
Application number	US-201615001772-A
Country	US
Kind code	A1
Filing date	Jan 20, 2016
Priority date	Jan 20, 2015
Publication date	Jul 21, 2016
Grant date	—

Abstract

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

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

First claim

1 . A liquid-crystalline medium based on a mixture of polar compounds, wherein said medium comprises the compound of formula I,

2 . The liquid-crystalline medium according to claim 1 , wherein said medium additionally comprises one or more compounds selected from the group of compounds of formulae IIA, IIB and 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 are each optionally 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—,
(O) denotes O or a single bond,
p denotes 1 or 2,
q denotes 0 or 1, and
v denotes 1 to 6.

3 . The liquid-crystalline medium according to claim 1 , wherein said medium additionally comprises 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 or alkoxy radical having up 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 —, —CF═CF—.

4 . The liquid-crystalline medium according to claim 1 , wherein said medium additionally comprises one or more compounds of 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 are each optionally 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,
(O) denotes O or a single bond,
alkyl denotes an alkyl radical having 1-6 C atoms, and
s denotes 1 or 2.

5 . The liquid-crystalline medium according to claim 1 , wherein said medium additionally comprises one or more terphenyls of formulae T-1 to T-21,

in which
R denotes a straight-chain alkyl or alkoxy radical having 1-7 C atoms or straight-chain alkenyl radical having 2-7 C atoms,
(O) denotes O or a single bond, and
m denotes 1-6.

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

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 are each optionally 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
the compound(s) of formula O-17 is (are) not identical with the compound of formula I.

7 . The liquid-crystalline medium according to claim 1 , wherein said medium additionally comprises one or more indane compounds of formula In,

in which
R 11 , R 12 , R 13 denote a straight-chain alkyl having 1-6 C atoms, alkoxy having 1-6 C atoms, alkoxyalkyl having 2-6 C atoms, or alkenyl having 2-6 C atoms,
R 12 and R 13 additionally may also denote H or halogen,

and
i denotes 0, 1 or 2.

8 . The liquid-crystalline medium according to claim 1 , wherein the proportion of compounds of formula I in the mixture as a whole is 1-30% by weight.

9 . The liquid-crystalline medium according to claim 1 , wherein said medium additionally comprises one or more compounds from the group of compounds of the formulae

10 . The liquid-crystalline medium according to claim 1 , wherein said medium additionally comprises a compound selected from the following group:

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

in which
R B1 , R B2 , R CR1 , R CR2 , R 1 , 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 are each optionally 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,
c denotes 0, 1 or 2,
d denotes 1 or 2, and
R 1 and R 2 each, independently of one another, denote alkyl having 1 to 6 C atoms, alkoxy having 1 to 6 C atoms, alkenyl having 2 to 6 C atoms, or alkenyloxy having 2 to 6 C atoms respectively.

12 . The liquid-crystalline medium according to claim 1 , wherein said medium comprises at least one polymerizable compound.

13 . The liquid-crystalline medium according to claim 1 , wherein said medium comprises one or more additives.

14 . The liquid-crystalline medium according to claim 13 , wherein said additive is selected from the group of free-radical scavengers, antioxidants and/or UV stabilizers.

15 . The liquid-crystal

Assignees

• Merck Patent Gmbh

Inventors

• Hirschmann Harald
• Windhorst I Martina

Classifications

• C09K19/3491 Primary

  having sulfur as hetero atom · CPC title

• C09K2019/3408

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

• C09K2019/3016

  Cy-Ph-Ph · CPC title

• C09K2019/3009

  Cy-Ph · CPC title

• C09K19/54

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