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AssigneeMerck Patent GmbH
InventorsEike Poetsch, Volker Meyer, Klaus P. Stahl, Volker Reiffenrath, Ulrich Finkenzeller, Ekkehard Bartmann, Reinhard Hittich, David Coates, Simon Greenfield, Graham Smith, Hans A. Kurmeier, Dieter Dorsch
Estimating the term…
Biphenylylethanes of the formula I ##STR1## in which one of the radicals R.sup.1 and R.sup.2 is X and the other radical R.sup.1 or R.sup.2 is R--Y-- where X is H, halogen, --CF.sub.3, --OCHF.sub.2, --OCF.sub.3, --CN, --NCS or --NO.sub.2, R is alkyl, fluoroalkyl, alkenyl or oxaalkyl and Y is O, S, --CO--O--, --O--CO--, --O--CO--O--, a single bond or--in the case where m=1--alternatively trans-1,4-cyclohexylene or ##STR2## m is 1 or 2, Ph is in each case identical or different radicals selected from the group comprising 1,4-phenylene, 2-fluoro-1,4-phenylene, 3-fluoro-1,4-phenylene and 3,5-difluoro-1,4-phenylene, L.sup.3 and L.sup.4 are each H, or one of these radicals is alternatively F, L.sup.1, L.sup.2 and L.sup.5 are each H or F, with the proviso that in the case where X=CN or R.sup.1 =--NCS, Y is trans-1,4-cyclohexylene or ##STR3## and/or m=2 and/or one of the radicals L.sup.1, L.sup.2 and L.sup.3 is fluorine and/or Ph--CN is 2-fluoro-4-cyanophenyl or 3,5-difluoro-4-cyanophenyl, are suitable as components of liquid-crystalline phases.
A nematic liquid crystalline phase containing at least two liquid crystalline components, characterized in that it contains at least one compound of Formula I ##STR43## in which one of the radicals R.sup.1 and R.sup.2 is X and the other radical R.sup.1 or R.sup.2 is R--Y--
A nematic liquid crystalline phase comprising at least two liquid crystalline components, which contains at least one compound of the formula Ia ##STR46## in which R is alkyl, fluoroalkyl, or oxaalkyl radicals of up to 10 C atoms;
A nematic liquid crystalline phase comprising at least two liquid crystalline components, which contains at least one compound of the formula Ib ##STR49## in which R is alkyl, fluoroalkyl, or oxaalkyl radicals of up to 10 C atoms;
Dependencies are inferred from the claim text.