Liquid-crystal medium
AssigneeMerck Patent GmbH
InventorsDagmar KLASS, Carsten FRITZSCH, Constanze BROCKE, Dmitry USHAKOV, Beate SCHNEIDER
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Abstract
The present invention relates to components for high-frequency technology, especially microwave components for high-frequency devices, such as devices for shifting the phase of microwaves, tunable filters, tunable metamaterial structures and electronic beam steering antennas (e.g. phased array antennas) comprising a liquid-crystalline medium, and to the liquid-crystalline medium used therein, wherein the liquid crystal medium comprises one or more compounds of formula S as defined in claim 1.
Claims21
A Liquid-crystal medium, characterised in that the medium comprises one or more compounds of formula S
- in which
- RS denotes H, alkyl or alkoxy having 1 to 12 C atoms, or alkenyl, alkenyloxy or alkoxyalkyl having 2 to 12 C atoms, in which one or more CH2-groups may be replaced by
- and
- in which one or more H atoms may be replaced by F,
- on each occurrence, independently of one another, denote
- in which RL, on each occurrence identically or differently, denotes H, Cl or alkyl having 1 to 6 C atoms,
- alternatively denotes
- LS1, LS2 identically or differently, denote H, Cl or F,
- RS1, RS2, identically or differently, denote H, alkyl or alkenyl, having up to 6 C atoms, or cyclopropyl, cyclobutyl, cyclopentenyl, or cyclopentyl,
- RTh1, RTh2 identically or differently, denote H, alkyl or alkenyl or alkoxy, having up to 6 C atoms, or cyclopropyl, cyclobutyl, cyclopentenyl or cyclopentyl,
- ZS1, ZS2, ZS3 identically or differently, denote —CH═CH—, —CH═CF—, —CF═CH—, —CF═CF—, —C≡C—, or a single bond,
- a, b identically or differently, are 0 or 1,
- and
- one or more compounds of formula IC
- in which
- R1 denotes H, alkyl or alkoxy having 1 to 15 C atoms, or alkenyl, alkenyloxy or alkoxyalkyl having 2 to 15 C atoms, in which one or more CH2-groups may be replaced by
- on each occurrence, independently of one another, denote
- in which RL, on each occurrence identically or differently, denotes H or alkyl having 1 to 6 C atoms.
A compound of formula S
- in which
- RS denotes H, alkyl or alkoxy having 1 to 12 C atoms, or alkenyl, alkenyloxy or alkoxyalkyl having 2 to 12 C atoms, in which one or more CH2-groups may be replaced by
- and
- in which one or more H atoms may be replaced by F,
- on each occurrence, independently of one another, denote
- in which RL, on each occurrence identically or differently, denotes H, Cl or alkyl having 1 to 6 C atoms,
- alternatively denotes
- LS1, LS2 identically or differently, denote H, Cl or F,
- RS1, RS2, identically or differently, denote H or alkyl having 1 to 6 C atoms, or cyclopropyl, cyclobutyl or cyclopentyl,
- RTh1, RTh2 identically or differently, denote H, alkyl, alkenyl or alkoxy having up to 6 C atoms,
- ZS1, ZS2, ZS3 identically or differently, denote —CH═CH—, —CH═CF—, —CF═CH—, —CF═CF—, or a single bond,
- a, b identically or differently, are 0 or 1,
- with the proviso that the compounds of the following formula S* are excluded:
- in which
- RS denotes alkyl, alkenyl or alkoxy having up to 9 C atoms,
- ZS2 denotes —CH═CH—, —CH═CF—, —CF═CH—, —CF═CF—, or a single bond,
- RS1, RS2 identically or differently, denote H or F, and
- LS1, LS2 identically or differently, denote H or F.
Dependencies are inferred from the claim text.