Liquid-crystalline medium for use in a switching element
AssigneeMerck Patent GmbH
InventorsMichael Junge, Andreas Beyer, Mila Fischer, Ewa Ptak
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Abstract
The present invention relates to liquid-crystalline media comprising one or more mesogenic compounds of formula I as set forth hereinafter, wherein the one or more compounds of formula I are contained in the medium in an amount, based on the overall contents of the medium, of at least 15% by weight. The present invention further relates to a switching layer, a switching element and a window element containing the liquid-crystalline medium.
Claims18
A window element, comprising a switching element, which switching element comprises a switching layer, which switching layer comprises a liquid-crystalline medium, wherein the switching layer is arranged between two substrates, and wherein the switching element is electrically switchable and operable in an optically transparent state and a scattering state, wherein the liquid-crystalline medium comprises
- one or more mesogenic compounds of formula I
- wherein
- R1 and R2 denote, independently of one another, F, Cl, CF3, OCF3, a straight-chain alkyl or alkoxy having 1 to 15 carbon atoms, a branched alkyl or alkoxy having 3 to 15 carbon atoms, a straight-chain alkenyl having 2 to 15 carbon atoms, or a branched alkenyl having 3 to 15 carbon atoms, which is unsubstituted, monosubstituted by CN or CF3 or mono- or polysubstituted by halogen and wherein one or more CH2 groups may be, in each case independently of one another, replaced by —O—, —S—, —CO—, —COO—, —OCO—, —OCOO— or —C≡C— in such a manner that oxygen atoms are not linked directly to one another,
- denotes
- n denotes 0 or 1, and
- denote, independently of one another,
- wherein L is on each occurrence, identically or differently, halogen selected from the group consisting of F, Cl and Br,
- and
- one or more chiral compounds,
- wherein the one or more compounds of formula I are contained in the medium in an amount, based on the overall contents of the medium, of at least 15% by weight, and
- wherein the medium exhibits a clearing point of 98° C. or more.
Dependencies are inferred from the claim text.