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US 11,920,075 B2Granted
Liquid-crystal medium
AssigneeMerck Patent GmbH
InventorsHarald Hirschmann, Andreas Pohle, Christian Hock, Martina Windhorst, Sabine Schoen
Life of this patent
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Abstract
The present invention relates to a liquid-crystalline medium (LC medium), to the use thereof for electro-optical purposes, and to LC displays containing this medium.
Claims26
An LC medium, having positive dielectric anisotropy and comprising one or more compounds of formula IA and one or more compounds of formula IB
- in which R1 and R2 in each case, independently of one another, denote alkyl, alkoxy, oxaalkyl or fluoroalkyl, in each case having 1 to 7 C atoms,
- the LC medium comprises no compounds of the formulae IA and IB in which one or both radicals R1 or R2 contain a C═C double bond,
- and wherein of the one or more compounds of formula IA at least one of formula IA1a and/or formula IA1b is present
- and of the one or more compounds of formula IB at least a compound of formula IB1a is present
- and wherein said medium further comprises one or more compounds selected from formulae XVIb1, XVIb2, and XVIb3
2 more elements
An LC medium, having positive dielectric anisotropy and comprising:
- one or more compounds of formula IA and one or more compounds of formula IB
- in which R1 and R2 n each case, independently of one another, denote alkyl, alkoxy, oxaalkyl or fluoroalkyl, in each case having 1 to 7 C atoms,
- wherein the LC medium comprises no compounds of the formulae IA and IB in which
- one or both radicals R1 or R2 contain a C═C double bond
- and wherein of the one or more compounds of formula IA at least one of formula IA1a and/or formula IA1b is present
- and of the one or more compounds of formula IB at least a compound of formula IB1a is present
- one or more compounds of formulae II and III
- in which the individual radicals, in each case independently of one another and identically or differently on each occurrence, have the following meaning
- R0 unsubstituted or halogenated alkyl or alkoxy having 1 to 15 C atoms, where, in addition, one or more CH2 groups in these radicals may in each case be replaced, independently of one another, by —CF2O—,
- —O—, —CO—O—or —O—CO— in such a way that O atoms are not linked directly to one another,
- X0 F, Cl, halogenated alkyl, halogenated alkoxy or halogenated alkenyloxy, in each case having up to 6 C atoms,
- Y1-6 H or F, and
- Y0 H or CH3;
- and
- one or more compounds of formula X
- in which
- R0 unsubstituted or halogenated alkyl or alkoxy having 1 to 15 C atoms, where, in addition, one or more CH2 groups in these radicals may in each case be replaced, independently of one another, by —CF2O—,
- —O—, —CO—O—or —O—CO— in such a way that O atoms are not linked directly to one another,
- X0 F, Cl, halogenated alkyl, halogenated alkoxy or halogenated alkenyloxy, in each case having up to 6 C atoms, and
- Y1-4 H or F.
17 more elements
An LC medium, having positive dielectric anisotropy and comprising:
- one or more compounds of formula IA and one or more compounds of formula IB
- in which R1 and R2 n each case, independently of one another, denote alkyl, alkoxy, oxaalkyl or fluoroalkyl, in each case having 1 to 7 C atoms,
- wherein the LC medium comprises no compounds of the formulae IA and IB in which one or both radicals R1 or R2 contain a C═C double bond
- and wherein of the one or more compounds of formula IA at least one of formula IA1a and/or formula IA1b is present
- and of the one or more compounds of formula IB at least a compound of formula IB1a is present
- one or more compounds of formulae II and III
- in which the individual radicals, in each case independently of one another and identically or differently on each occurrence, have the following meaning
- R0 unsubstituted or halogenated alkyl or alkoxy having 1 to 15 C atoms, where, in addition, one or more CH2 groups in these radicals may in each case be replaced, independently of one another, by —CF2O—,
- —O—, —CO—O—or —O—CO— in such a way that O atoms are not linked directly to one another,
- X0 F, Cl, halogenated alkyl, halogenated alkoxy or halogenated alkenyloxy, in each case having up to 6 C atoms,
- Y1-6 H or F, and
- Y0 H or CH3;
- and
- one or more compounds of formula XI
- in which
- R0 unsubstituted or halogenated alkyl or alkoxy having 1 to 15 C atoms, where, in addition, one or more CH2 groups in these radicals may in each case be replaced, independently of one another, by —CF2O—,
- —O—, —CO—O—or —O—CO— in such a way that O atoms are not linked directly to one another, and
- Y2-4 H or F.
15 more elements
An LC medium, having positive dielectric anisotropy and comprising:
- one or more compounds of formula IA and one or more compounds of formula IB
- in which R1 and R2 n each case, independently of one another, denote alkyl, alkoxy, oxaalkyl or fluoroalkyl, in each case having 1 to 7 C atoms,
- wherein the LC medium comprises no compounds of the formulae IA and IB in which one or both radicals R1 or R2 contain a C═C double bond
- and wherein of the one or more compounds of formula IA at least one of formula IA1a and/or formula IA1b is present
- and of the one or more compounds of formula IB at least a compound of formula IB1a is present
- and
- one or more stabilizers of the following formulae
- in which the individual radicals, in each case independently of one another and identically or differently on each occurrence, have the following meaning
- Ra-d C1-10-straight-chain or C3-10-branched alkyl,
- Xs H, CH3, OH or O*,
- As C1-20-straight-chain, C3-20-branched or C3-20-cyclic alkylene, which is optionally substituted, and
- n an integer from 1 to 6.
9 more elements
Dependencies are inferred from the claim text.