Liquid crystals

Details Liquid crystals Liquid crystals

1991-01-22

1993-04-20

Stoll, Robert L.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229961, 25229966, 25229967, 25229962, 2522995, 560 64, 560 65, 560102, 544224, 544239, 544298, 546339, 546342, 546340, 568647, 568631, 568642, 549369, 549370, C09K 1930, C09K 1934, C09K 1954, C07D23902

Patent

active

052040186

ABSTRACT:
Compounds of the formula ##STR1## wherein n stands for the number 0 or 1; R.sup.1 denotes a group R.sup.3 or R.sup.3 --A.sup.3 --Z.sup.2 -- and R.sup.2 denotes a group R.sup.4 or R.sup.4 --A.sup.4 --Z.sup.3 --; ring A.sup.1 signifies unsubstituted or halogen-, cyano- and/or methyl-substituted 1,4-phenylene in which optionally 1 CH group or 2 CH groups is/are replaced by nitrogen; A.sup.3, A.sup.4 and ring A.sup.2 each independently represent unsubstituted or halogen-, cyano- and/or methyl-substituted 1,4-phenylene in which optionally 1 CH group or 2 CH groups is/are replaced by nitrogen or trans-1,4-cyclohexylene, trans-1,3-dioxane-2,5-diyl, 1-cyano-trans-1,4-cyclohexylene, bicyclo[2.2.2]octane-1,4-diyl, naphthalene-2,6-diyl, tetralin-2,6-diyl or trans-decalin-2,6-diyl; Z.sup.1, Z.sup.2 and Z.sup.3 each independently signify a single covalent bond, --COO--, --OOC--, --CH.sub.2 O--, --OCH.sub.2 --, --CH.tbd.C--, --(CH.sub.2).sub.3 O--, --O(CH.sub.2).sub.3 --, --(CH.sub.2).sub.4 -- or the trans form of --CH.dbd.CH--CH.sub.2 --CH.sub.2 --, --CH.sub.2 CH.sub.2 --CH.dbd.CH--, --CH.dbd.CH--CH.sub.2 O-- or --OCH.sub.2 --CH.dbd.CH--; R.sup.3 and R.sup.4 each independently denote halogen, cyano, --NCS, --CF.sub.3, --OCF.sub.3 or alkyl in which optionally one >CH--CH< is replaced by >C.dbd.C< and/or optionally one methylene group or two non-adjacent methylene groups is/are replaced by --O--, --COO-- and/or --OOC-- and/or optionally one methylene group is replaced by --CHX--; and X signifies halogen, cyano or methyl,
as well as liquid crystalline mixtures which contain such compounds and their use for electro-optical purposes.

REFERENCES:
patent: 4035056 (1977-07-01), Coates et al.
patent: 4627933 (1986-12-01), Eidenschink et al.
Kelly, S. M., Mol. Cryst. Liq. Cryst. vol. 24, pp. 27-35 (1991) (Presented at The Thirteenth International Liquid Crystal Conference, Vancouver, British Columbia, Canada, 22-27, Jul. 1990).
Derwent Abstract No. 91-074773/11 for WO 91/03450.
Influence of Molec. Structure Gray et al, Editor Liquid Crystals & Plastic Crystals vol. 1, 1974.
Kelly, S. M., "The Synthesis and Liquid Crystal Transition Temperature . . . " Presentation at British Colombia, Canada (Jul. 1990).
R. Weidauer, R. Frach and H.-J. Deutscher, Doktoranden-kolloquim "Anisotrope Fluide", (Berlin 1990).

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