Liquid-crystal medium

Patent metadata

Field	Value
Publication number	US-2023392077-A1
Application number	US-202318204621-A
Country	US
Kind code	A1
Filing date	Jun 1, 2023
Priority date	Jun 2, 2022
Publication date	Dec 7, 2023
Grant date	—

Abstract

A liquid-crystal (LC) medium based on a mixture of polar compounds, its use for optical, electro-optical and electronic purposes, in particular in LC displays, especially in LC displays of the vertically aligned mode, to an LC display of the vertically aligned mode containing the LC medium, especially an energy-saving LC display and a process of manufacturing the LC display.

First claim

1 . An LC medium having negative dielectric anisotropy and comprising one or more compounds of formula IA

in which the individual radicals, on each occurrence identically or differently, and each, independently of one another, have the following meaning:
R 1A is an alkyl or alkoxy group having 1 to 12, wherein one or more non-adjacent CH 2 -groups are replaced by cyclopropyl, cyclobutyl or cyclopentyl,
R 2A is a straight chain alkyl having 1 to 25 C atoms or a branched or cyclic alkyl having 3 to 25 C atoms, wherein one or more non-adjacent CH 2 -groups are optionally replaced by —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O—, CR 0 ═CR 00 —, —C≡C—,

in such a manner that O- and/or S-atoms are not directly connected with each other, and wherein one or more H atoms are each optionally replaced by F or Cl,
L 1A , L 2A are F, Cl, CF 3 or CHF 2 ,
Y is H, F, Cl, CF 3 , CHF 2 or CH 3 , and
n 0 or 1.

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

wherein “(O)” denotes an oxygen atom or a single bond and “alkyl” denotes an alkyl group with 1 to 6 C atoms.

3 . The LC medium according to claim 1 , further comprising one or more compounds selected from the group consisting of compounds of formulae IIA, IIB, IIC and IID

in which the individual radicals, on each occurrence identically or differently, and each, independently of one another, have the following meaning:
R 21 , R 22 are H, an alkyl or alkoxy radical having 1 to 15 C atoms or an or alkenyl radical having 2 to 15 C atoms, each of which is un-substituted or monosubstituted by F, Cl, CN or CF 3 and in which one or more CH 2 groups may be replaced by —O—, —S—, —C≡C—, —CF 2 O—, —OCF 2 —, —OC—O—, —O—CO—

in such a way that O- and/or S-atoms are not linked directly to one another,
L 1 to L 4 are F, Cl, CF 3 or CHF 2 ,
Y is H, F, Cl, CF 3 , CHF 2 or CH 3 ,
Z 1 , Z 2 are 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—, or —CH═CHCH 2 O,
p is 0, 1 or 2, and
q is 0 or 1,
wherein in formula IID, if Z 1 and Z 2 denote a single bond, then R 21 is different from cyclic alkyl or alkoxy.

4 . The LC medium according to claim 1 , additionally comprising one or more compounds selected from the group of compounds of formulae IV-1 to IV-4,

in which
alkyl and alkyl′ denote, independently of one another, alkyl having 1 to 7 C atoms,
alkenyl denotes an alkenyl radical having 2 to 5 C atoms,
alkenyl′ denotes an alkenyl radical having 2 to 5 C atoms, and
alkoxy denotes alkoxy having 1 to 5 C atoms.

5 . The LC medium according to claim 1 , additionally comprising one or more compounds of formula V

in which
R 51 , R 52 denote, independently of one another, H, an alkyl or alkoxy radical having 1 to 15 C atoms or an alkenyl radical having 2 to 15 C atoms, each of which is unsubstituted, monosubstituted by F, Cl, CN or CF 3 or at least monosubstituted by halogen, and in which one or more CH 2 groups may be replaced by —O—, —S—, —C≡C—, —CF 2 O—, —OCF 2 —, —OC—O—, —O—CO—

in such a way that O atoms are not linked directly to one another,

identically or differently, denote

Z 51 , Z 52 each, independently of one another, denote —CH 2 —CH 2 —, —CH 2 —O—, —CH═CH—, —C≡C—, —COO— or a single bond, and
n is 1 or 2.

6 . The LC medium according to claim 1 , additionally comprising one or more additives selected from the group consisting of polymerizable compounds, stabilisers, chiral dopants, polymerization initiators and self alignment additives.

7 . A process for preparing the LC medium according to claim 1 , comprising mixing one or more compounds of formula IA with one or more further LC compounds other than compounds of formula 1A and optionally with one or more additives.

8 . An LC display comprising the LC medium as defined in claim 1 .

9 . The LC display of claim 8 , which is an LC display of the VA, IPS, FFS, UB-FFS or UV 2 A mode.

10 . An energy-saving LC display comprising the LC medium as defined in claim 1 .

Assignees

• Merck Patent Gmbh

Inventors

• Hirschmann Harald
• Schoen Sabine
• Wucher Philipp

Classifications

• C09K19/3491 Primary

  having sulfur as hetero atom · CPC title

• C09K19/3098 Primary

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

• C09K2019/3004

  Cy-Cy · CPC title

• C09K2019/0448

  the end chain group being a polymerizable end group, e.g. -Sp-P or acrylate · CPC title

• C09K2019/3009

  Cy-Ph · CPC title