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AssigneeMerck Patent GmbH
InventorsGeorge W. Gray, Michael Hird, David Lacey, Kenneth J. Toyne, Volker Reiffenrath, Andreas Wachtler, Joachim Krause, Ulrich Finkenzeller, Thomas Geelhaar
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This invention relates to fluorinated oligophenyls of formula (I), in which a is 0 or 1 and in which the terminal substituents R.sup.1, R.sup.2 and R.sup.3 are each independently an alkyl or alkenyl residue each with up to 15 C atoms, optionally substituted by CN or by at least one halogen atom, and wherein one or more non adjacent CH.sub.2 groups of these residues may be replaced by --O--, --S--, --CO--, --O--CO--, --CO--O--, --O--CO--O-- or --C.tbd.C--, one of the residues R.sup.1 and R.sup.2 may also denote a group of formula (II), any one of the following pairs of lateral substituents are both fluorine: (A, B), (C, D), (D, E), (C, E), (B, C), (D, J), (D, K), (A, C), (C, J), (C', D'), (D', E), (D', A), (C', E), (C', A), (D', J'), (D', K'), (C', J'), (B, G), (A, G), all of the other lateral substituents being hydrogen or fluorine, and to their use as components of liquid crystalline compositions.
A chiral tilted smectic liquid crystalline composition comprising at least two liquid crystalline compounds, wherein at least one compound is a terphenyl of formula I:
A composition containing a compound of formula I' ##STR28## wherein A.sup.1 and A.sup.2 are each independently a 1,4-phenylene group optionally substituted by one to four fluorines,
A chiral tilted smectic composition comprising at least two LC comopunds, wherein at least one compound is a biphenyl compound of the formula ##STR29## in which the terminal substituents R.sup.1, R.sup.2 and R.sup.3 are each independently an alkyl or alkenyl residue each with up to 15 C atoms, optionally substituted by CN or by at least one halogen atom, and wherein one or more non-adjacent CH.sub.2 groups of these residues may be replaced by --O--, --S--, --CO--, --O--CO--, --CO--O--, --O--CO--O or --C.tbd.C--, one of the residues R.sup.1 and R.sup.2 may also denote a group of the formula, ##STR30## any one of the following pairs of lateral substitutents are both fluorine:
A compound of the formula:
An electro-optical display element based on the ECB effect, containing a liquid crystalline phase, which has a negative dielectric anisotropy, comprising at least one liquid crystalline component is a compound of formula I' ##STR33## wherein A.sup.1 and A.sup.2 are each independently a 1,4-phenylene group optionally substituted by one to four fluorines,
Dependencies are inferred from the claim text.