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AssigneeMerck Patent Gesellschaft
InventorsMark Goulding, Simon Greenfield, David Coates, Robert Clemitson
Estimating the term…
Disclosed is a nematic liquid crystal mixture having a positive dielectric anisotropy .DELTA..epsilon. of at least +4 and a birefringence .DELTA.n of at least 0.18, said mixture comprising at least one fluorinated chloroterphenyl compound of formula I R--E--Cl I wherein R is an alkyl or alkenyl radical having up to 15 C atoms, said radical being unsubstituted or substituted by halogen, one or more CH.sub.2 groups in the radical optionally being replaced, in each case independently of one another, by --O--, ##STR1## in such a manner that oxygen atoms are not linked directly to one another, and is ##STR2## or the mirror image thereof, and wherein the benzene rings can be optionally further substituted by fluorine.
A nematic liquid crystal mixture having a positive dielectric anisotropy .DELTA..epsilon. of at least one fluorinated chloroterphenyl compound of formula I, Ia1, Ia2 or Ia3:
A fluorinated chloroterphenyl of formula Ia ##STR98## wherein R is an alkyl or alkenyl radical having up to 15 C atoms, the radical being unsubstituted or substituted by halogen, one or more CH.sub.2 groups in these radicals optionally being replaced, in each case independently of one another, by --O--, ##STR99## in such manner that oxygen atoms are not linked directly to one another.
A fluorinated chloroterphenyl of the formula IA1:
A fluorinated chloroterphenyl of the formula Ia2:
A fluorinated chloroterphenyl of the formula Ia3:
Dependencies are inferred from the claim text.