Liquid crystals

Details Liquid crystals Liquid crystals

1987-05-26

1993-08-24

Tucker, Philip C.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

2522995, 2522996, 25229961, 25229963, 25229966, 25229967, 25229968, 560 51, 560 55, 560 59, 560 61, 560 65, 560 73, 560102, 560106, 560107, 560109, 560118, 560126, 560141, 560 1, 359105, 359106, C09K 1912, C09K 1934, C07C 6976, C07C 6974

Patent

active

052386023

ABSTRACT:
Compounds of the formula ##STR1## wherein n stands for the number 0 or 1; the rings A.sup.1, A.sup.2 and A.sup.3 represent 1,4-phenylene, 2-fluoro-1,4-phenylene or trans-1,4-cyclohexylene or one of these rings also represents a 2,5-disubstituted pyrimidine ring or a trans-2,5-disubstituted m-dioxane ring; X.sup.1 represents a single covalent bond, --COO--, --OOC--, --CH.sub.2 CH.sub.2 --, p--C.sub.6 H.sub.4 --, --CH.sub.2 CH.sub.2 --p-- C.sub.6 H.sub.4 --, --CH.sub.2 CH.sub.2 --p--C.sub.6 H.sub.4 --CH.sub.2 CH.sub.2 -- or, insofar as the rings A.sup.1 and A.sup.2 represent 1,4-phenylene, also --NON--; R.sup.2 represents 1E-alkenyl, 2Z-alkenyl, 3E-alkenyl, 4-alkenyl or alkenyloxy, with the proviso that the oxygen atom in alkenyloxy is linked with a saturated carbon atom; and R.sup.1 signifies 1E-alkenyl, 2Z-alkenyl, 3E-alkenyl, 4-alkenyl or, insofar as R.sup.2 represents alkenyloxy, also alkyl, their manufacture, as well as liquid crystalline mixtures and the use for electro-optical purposes.

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