Liquid-crystalline media

Patent metadata

Field	Value
Publication number	US-9982194-B2
Application number	US-201514674518-A
Country	US
Kind code	B2
Filing date	Mar 31, 2015
Priority date	Dec 20, 2011
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

The invention relates to liquid-crystalline media which can be used, in particular, for electro-optical displays having active-matrix addressing based on the ECB effect and for IPS (in-plane switching) displays or FFS (fringe field switching) displays.

First claim

What is claimed is:

1. A liquid-crystalline medium comprising:
(i) at least one compound of the formula I,

in which
R 1 and R 1* 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,
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 —, —CF═CF—, —CH═CHCHO—,
L 1 and L 2 each, independently of one another, denote F, Cl, CF 3 or CHF 2 ;

(ii) one or more compounds selected from the group consisting of compounds of the formulae L-1 to L-11, CCH-nOm, P-4, and EY,

in which
R, R 1 and R 2 each, independently of one another, denote H, an alkyl 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,
alkyl denotes an alkyl radical having 1-6 C atoms, and
s denotes 1 or 2;

in which
n and m each, independently of one another, denote 1, 2, 3, 4, 5 or 6,

wherein
R 1 is an alkyl or alkoxy radical having 1 to 15 C atoms, wherein 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—, —O—CO— in such a way that O atoms are not linked directly to one another, and wherein, in addition, one or more H atoms may be replaced by halogen;

in which
R 1 and R 1* 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,
L 1 and L 2 each, independently of one another, denote F, Cl, CF 3 or CHF 2 ;
and

(iii) at least two compounds selected from the group of compounds of formulae IIA, IIB and IIC,

in which
R 2A and R 2B 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,
R 2c each, independently of one another, denote H, an alkyl 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 1 or 2, and
v denotes 1 to 6.

2. The liquid-crystalline medium according to claim 1 , wherein the proportion of one or more compounds of the formula I in the mixture as a whole is 10-45% by weight.

3. The liquid-crystalline medium according to claim 1 further comprising one or more compounds selected from the compounds of formulae BC, CR, PH-1, PH-2 and BF,

in which
R B1 , R B2 , R CR1 , R CR2 , R 1 , R 2 each, independently of one another, denote H, an alkyl 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,
c is 0, 1 or 2.

4. The liquid-crystalline medium according to claim 1 further comprising one or more additives selected from the group consisting of stabilisers, antioxidants, UV absorbers, nanoparticles, microparticles, and a combination thereof.

5. The liquid-crystalline medium according to claim 1 further comprising one or more additives selected from the following compounds:

in which n=1, 2, 3, 4, 5, 6 or 7

6. The liquid-crystalline medium according to claim 1 further comprising one or more BHT derivatives.

7. The liquid-crystalline medium according to claim 1 , wherein the liquid-crystalline medium comprises at least one compound of formula I selected from the group consisting of formulae I-1 through I-145:

Assignees

• Merck Patent Gmbh
• Mereck Patent Gmbh

Inventors

• Klasen-Memmer Melanie
• Reuter Marcus
• Fortte Rocco
• Pauluth Detlef
• Bremer Matthias
• Haensel Helmut
• Hirschmann Harald

Classifications

• C09K19/20

  linked by a chain containing carbon and oxygen atoms as chain links, e.g. esters {or ethers} · CPC title

• C09K2019/123

  Ph-Ph-Ph · CPC title

• C09K19/44 Primary

  containing compounds with benzene rings directly linked · CPC title

• C09K2019/3027

  Compounds comprising 1,4-cyclohexylene and 2,3-difluoro-1,4-phenylene · CPC title

• C09K2019/122

  Ph-Ph · CPC title