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US 5,310,501 AGranted
Anisotropic compounds having Nematic phase and liquid crystal mixtures
AssigneeMerck Patent GmbH
InventorsTuong Huynh-Ba, Maged A. Osman
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Abstract
Anisotropic compounds having a nematic phase have the formula ##STR1## wherein R.sup.1, R.sup.2, A, Z, X and n are described in the specification. Compounds having the defined lateral substituents on the rings have a reduced tendency to form smectic phases as compared with the compounds not having such lateral substituents.
Claims7
A liquid crystal mixture comprising at least two compounds and containing at least one anisotropic compound having the formula:
- ##STR26## wherein Z is selected from the group consisting of a single bond and, a --CH.sub.2 CH.sub.2 --group,
- n is 1 or 2,
- X is selected from the group consisting of fluorine, chlorine, bromine and iodine,
- R.sup.2 is selected from the group consisting of C.sub.1 -C.sub.12 -alkyl, C.sub.1 -C.sub.12 -alkoxy, C.sub.1 -C.sub.12 -alkanoyloxy and the cyclic group of the formula (16);
- ##STR27## wherein R.sup.6 is selected from the group consisting of C.sub.1 -C.sub.12 -alkyl, C.sub.1 -C.sub.12 -alkoxy, and C.sub.1 -C.sub.12 -alkanoyloxy, is selected from the group consisting of a single bond and, a --CH.sub.2 CH.sub.2 --group.
2 more elements
Dependencies are inferred from the claim text.