Liquid-crystalline medium

Patent metadata

Field	Value
Publication number	US-10351771-B2
Application number	US-201414458312-A
Country	US
Kind code	B2
Filing date	Aug 13, 2014
Priority date	Aug 16, 2013
Publication date	Jul 16, 2019
Grant date	Jul 16, 2019

Abstract

The invention relates to a liquid-crystalline medium comprising at least one compound of the formula I,

in which R 1 has the meanings indicated in Claim 1 , and to the use thereof in liquid-crystalline media and in electro-optical liquid-crystal displays.

First claim

The invention claimed is:

1. Liquid-crystalline medium, comprising:
one or more compounds of the 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 are optionally replaced, independently of one another, by —C≡C—, —CF 2 O—, —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, in addition, one or more H atoms are optionally replaced by halogen,

one or more compounds selected from the group consisting of compounds of the following formulae,

in which R 3a and R 4a each, independently of one another, denote H, CH 3 , C 2 H 5 or C 3 H 7 , provided that for formula IIb R 3a is not hydrogen, and “alkyl” denotes a straight-chain alkyl group having 1 to 8 C atoms,
and
one or more compounds selected from the group consisting of compounds of the formulae X and XI,

in which
R 0 denotes an alkyl or alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH 2 groups in these radicals are optionally replaced, independently of one another, —C≡C—, —CF 2 O—, —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, in addition, one or more H atoms are optionally replaced by halogen,
X 0 denotes F, Cl, a mono- or polyfluorinated alkyl or alkoxy radical having 1 to 6 C atoms, or a mono- or polyfluorinated alkenyl or alkenyloxy radical having 2 to 6 C atoms,
Y 1-4 each, independently of one another, denote H or F, and

 each, independently of one another, denote

wherein the liquid-crystalline medium has a positive dielectric anisotropy.

2. Liquid-crystalline medium according to claim 1 , wherein R 1 in formula I denotes a straight-chain alkyl radical, in which, in addition, one or more CH 2 groups may be replaced by —CH═CH—.

3. Liquid-crystalline medium according to claim 1 , which comprises at least one compound of formula I which is from the group of the compounds of the formulae I-1 to I-5

4. Liquid-crystalline medium according to claim 1 , which additionally comprises one or more compounds selected from the compounds of the formulae IV to VIII,

in which
R 0 denotes an alkyl or alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH 2 groups in these radicals are optionally replaced, independently of one another, by —C≡C—, —CF 2 O—, —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, in addition, one or more H atoms are optionally replaced by halogen,
X 0 denotes F, Cl, a mono- or polyfluorinated alkyl or alkoxy radical having 1 to 6 C atoms, a mono- or polyfluorinated alkenyl or alkenyloxy radical having 2 to 6 C atoms,
Y 1-6 each, independently of one another, denote H or F,
Z 0 denotes —C 2 H 4 —, —(CH 2 ) 4 —, —CH═CH—, —CF═CF—, —C 2 F 4 —, —CH 2 CF 2 —, —CF 2 CH 2 —, —CH 2 O—, —OCH 2 —, —COO—, —CF 2 O— or —OCF 2 —, and in the formulae V and VI may also denote a single bond, and
r denotes 0 or 1.

5. Liquid-crystalline medium according to claim 1 , which additionally comprises one or more compounds selected from the compounds of the formulae Va to Vj,

in which
R 0 denotes an alkyl or alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH 2 groups in these radicals are optionally replaced, independently of one another, by —C≡C—, —CF 2 O—, —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, in addition, one or more H atoms are optionally replaced by halogen,
X 0 denotes F, Cl, a mono- or polyfluorinated alkyl or alkoxy radical having 1 to 6 C atoms, or a mono- or polyfluorinated alkenyl or alkenyloxy radical having 2 to 6 C atoms.

6. Liquid-crystalline medium according to claim 1 , which additionally comprises one or more compounds selected from the compounds of the formulae VI-1a to VI-1d,

in which
R 0 denotes an alkyl or alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH 2 groups in these radicals are optionally replaced, independently of one another, by —C≡C—, —CF 2 O—, —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, in addition, one or more H atoms are optionally replaced by halogen,
X 0 denotes F, Cl, a mono- or polyfluorinated alkyl or alkoxy radical having 1 to 6 C atoms, or a mono- or polyfluorinated alkenyl or alkenyloxy radical having 2 to 6 C atoms.

7. Liquid-crystalline medium according to claim 1 , which additionally comprises one or more compounds selected from the compounds of the formulae VI-2a to VI-2f,

in which
R 0 denotes an alkyl or alkoxy radical having 1 to 15 C atoms, where, in addition, one or more CH 2 groups in these radicals are optionally replaced, independently of one another, by —C≡C—, —CF 2 O—, —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, in addition, one or more H atoms are optionally replaced by halogen,
X 0 denotes F, Cl, a mono- or polyfluorinated alkyl or alkoxy radical having 1 to 6 C atoms, or a mono- or polyfluorinated alkenyl or alkenyloxy radical having 2 to 6 C atoms.

8. Liquid-crystalline medium according to claim 1 , which additionally comprises one or more compounds selected from the compounds of the formula XII,

in which
R 1 and R 2 each, independently of one another, denote alkyl, alkenyl, alkoxy, oxaalkyl, fluoroal

Assignees

• Merck Patent Gmbh

Inventors

• Goebel Mark
• Lietzau Lars
• Schoen Sabine
• Pohle Andreas

Classifications

• C09K2019/301

  Cy-Cy-Ph · CPC title

• C09K19/3068

  chain containing -COO- or -OCO- groups · CPC title

• C09K19/3003

  Compounds containing at least two rings in which the different rings are directly linked (covalent bond) · CPC title

• C09K2019/0466

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

• C09K2019/3004

  Cy-Cy · CPC title