CPC C09K 19/3402 (2013.01) [C09K 19/0208 (2013.01); C09K 2019/0466 (2013.01); C09K 2019/3422 (2013.01); G02F 1/137 (2013.01); G02F 1/13706 (2021.01)] | 26 Claims |
1. An LC medium with positive dielectric anisotropy, wherein said LC medium has a clearing point ≥105° C. and a birefringence from 0.10 to 0.13, and comprises
at least one compound of formula I in a total concentration of said at least one compound of formula I of >0 and ≤10%
in which
R1 and R2 independently of each other denote alkyl having 1 to 6 C atoms,
and
at least one compound of formula XII
in which
X0 is F, Cl, CN, SF5, SCN, NCS, a halogenated alkyl radical, a halogenated alkenyl radical, a halogenated alkoxy radical or a halogenated alkenyloxy radical having up to 6 C atoms,
“alkenyl” denote C2-6-alkenyl, and
L denotes H or F.
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2. An LC medium with positive dielectric anisotropy, comprising
at least one compound of formula I in a total concentration of said at least one compound of formula I of >0 and ≤10%
in which
R1 and R2 independently of each other denote alkyl having 1 to 6 C atoms,
and
at least one compound of formula XII
in which
X0 is F, Cl, CN, SF5, SCN, NCS, a halogenated alkyl radical, a halogenated alkenyl radical, a halogenated alkoxy radical or a halogenated alkenyloxy radical having up to 6 C atoms,
“alkenyl” denote C2-6-alkenyl, and
L denotes H or F
and
at least one compound of the following formulae III6, III9, III20 and/or III21
in which
R0 is an unsubstituted or halogenated alkyl or alkoxy radical having 1 to 15 C atoms, in which one or more CH2 groups are each optionally replaced, independently of one another, by —C≡C—, —CF2O—, —CH═CH—,
—O—, —CO—O— or —O—CO— in such a way that O atoms are not linked directly to one another, or denotes
X0 is F, Cl, CN, SF5, SCN, NCS, a halogenated alkyl radical, a halogenated alkenyl radical, a halogenated alkoxy radical or a halogenated alkenyloxy radical having up to 6 C atoms, and
Y2 is H or F.
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