Anisotropic compounds and liquid crystal mixtures therewith
AssigneeMerck Patent GmbH
InventorsHans P. Schad, Stephen M. Kelly
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Abstract
Anisotropic compounds of the formula (1) specified in claim 1 are suitable, owing to their low .DELTA..epsilon./.epsilon..perp. values for liquid crystal displays which have high information densities of for examples up to 10.sup.6 image dots and accordingly need to be highly multiplexible; compared with known compounds they offer improved application properties and are relatively simple to synthesize.
Claims16
A compound of the formula ##STR15## in which R is an alkyl, alkoxy, or alkanoyloxy group which has in each case 1-12 C atoms in the alkyl moiety and which has a straight or branched and chiral or non-chiral chain, X.sup.2 and X.sup.3 are independently hydrogen, halogen or nitrile, X.sup.4 is halogen or nitrile, Z is the ether oxygen bridge --O-- and m and n are independently 0, 1 or 2 with the provisos that
- (a) the sum of n and m is at least 1 and at most 3, and
- (b) at least one of the groups X.sup.2 and X.sup.3 is not hydrogen.
Dependencies are inferred from the claim text.