Liquid crystals

Details Liquid crystals Liquid crystals

1988-08-31

1991-05-07

Lovering, Richard D.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229961, 25229962, 25229965, 25229966, 25229967, 350350R, C09K 1930, C09K 1932, C09K 1912, G02F 113

Patent

active

050134787

ABSTRACT:
Compounds of the formula ##STR1## wherein, inter alia, R.sup.1 is hydrogen or straight-chain alkyl; R.sup.2 is --CN, --R, --COR, --COOR; R is alkyl; A is a group with 1 to 4 six-membered rings, these rings being linked directly with one another and with ring B in each case via a single covalent bond or being linked at one or two positions also via ester or ether groups; the six-membered rings in A and ring B each are 1,4-phenylene or trans-1,4-cyclohexylene or one of these rings also is trans-2,5-disubstituted m-dioxane; m can be 0 when ring B is trans-1,4-cyclohexylene or trans-2,5-disubstituted m-dioxane,
liquid crystalline mixtures which contain these compounds as well as their use for electro-optical purposes are described.

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