Liquid-crystalline dielectric
AssigneeMerck Patent GmbH
InventorsRudolf Eidenschink, Ludwig Pohl, Georg Weber, Fernando Del Pino
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Abstract
A liquid-crystalline dielectric having a positive dielectric anisotropy comprises a biphenyl derivative of the formula ##STR1## wherein R.sub.1 is alkyl of 1-4 C atoms or alkoxy of 1-3 C atoms, and a phenylcyclohexane derivative of the formula ##STR2## wherein R.sub.2 is alkyl of 1-4 C atoms, in a weight ratio of 3:1 to 1:3.
Claims8
A liquid-crystalline dielectric having a positive dielectric anisotropy comprising at least one biphenyl derivative of the formula ##STR6## wherein R.sub.1 is alkyl of 1-4 C atoms or alkoxy of 1-3 C atoms, and at least one phenylcyclohexane derivative of the formula ##STR7## wherein R.sub.2 is alkyl of 1-4 C atoms, in a weight ratio of 3:1 to 1:3, said dielectric containing at least four of said biphenyl and phenylcyclohexane derivatives combined.
A liquid-crystalline dielectric having a positive dielectric anisotropy comprising at least one biphenyl derivative of the formula ##STR8## wherein R.sub.1 is alkyl of 1-4 C atoms or alkoxy of 1-3 C atoms, and at least one phenylcyclohexane derivative of the formula ##STR9## wherein R.sub.2 is alkyl of 1-4 C atoms, in a weight ratio of 3:1 to 1:3, and further comprising a cyclohexane derivative of the formula ##STR10## wherein the ring A is 1,4-disubstituted phenyl or cyclohexane and R.sub.3 and R.sub.4 are each straight-chain alkyl of 1-8 C;
- or, if ring A is phenyl, R.sub.4 is also alkoxy or alkanoyloxy, of up to 8 C atoms in each case, or CN.
Dependencies are inferred from the claim text.