Liquid crystalline mixtures and method of making same
AssigneeHoffmann-La Roche Inc.
InventorsRichard Buchecker, Martin Schadt, Alois Villiger
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Abstract
A compound of the formula ##STR1## wherein Z represents a single covalent bond or --CH.sub.2 --CH.sub.2 --; R.sup.1 denotes alkyl or 2-alkenyl and R.sup.2 is 1E-alkenyl, 3E-alkenyl, 4-alkenyl, (2-alkenyl)oxymethyl or, when R.sup.1 denotes 2-alkenyl and/or Z represents --CH.sub.2 --CH.sub.2 --, R.sup.2 also is alkyl, cyano or alkoxymethyl, as well as the manufacture of the compounds of formula I. Also disclosed is the use of the compounds in liquid crystalline mixtures and for electro-optical purposes.
Claims15
A compound of formula ##STR9## wherein Z is a single covalent bond or --CH.sub.2 --CH.sub.2 --;
- R.sup.1 is alkyl of 1 to 10 carbon atoms or 2-alkenyl of 3 to 10 carbon atoms;
- and R.sup.2 is 1E-alkenyl, 3E-alkenyl, 4-alkenyl, (2-alkenyl)oxymethyl, alkyl, or alkoxymethyl having from 1 to 12 carbon atoms;
- with the proviso that R.sup.1 is 2-alkenyl and Z is --CH.sub.2 CH.sub.2 -- when R.sup.2 is alkyl or alkoxymethyl.
A liquid crystalline mixture having at least two components, wherein at least one component is a compound of formula ##STR10## wherein Z is a single covalent bond or --CH.sub.2 --CH.sub.2 --;
- R.sup.1 is alkyl of 1 to 10 carbon atoms or 2-alkenyl of 3 to 10 carbon atoms;
- and R.sup.2 is 1E-alkenyl, 3E-alkenyl, 4-alkenyl, (2-alkenyl)oxymethyl, alkyl or alkoxymethyl having from 1 to 12 carbon atoms;
- with the proviso that R.sup.1 is 2-alkenyl and Z is --CH.sub.2 CH.sub.2 -- when R.sup.2 is alkyl or alkoxymethyl.
In a ferroelectric electro-optical indicating device of the type having a liquid crystalline mixture sandwiched between two transparent plates having polarizers and electrode-means, wherein the improvement comprises:
- said liquid crystalline mixture having a positive dielectric anisotropy and containing at least two components wherein at least one component is a compound formula ##STR12## wherein Z is a single covalent bond or --CH.sub.2 --CH.sub.2 --;
- R.sup.1 is alkyl of 1 to 10 carbon atoms or 2-alkenyl of 3 to 10 carbon atoms;
- and R.sup.2 is 1E-alkenyl, 3E-alkenyl, 4-alkenyl, (2-alkenyl)oxymethyl, alkyl or alkoxymethyl having from 1 to 12 carbon atoms;
- with the proviso that R.sup.1 is 2-alkenyl and Z is --CH.sub.2 CH.sub.2 -- when R.sup.2 is alkyl or alkoxymethyl.
Dependencies are inferred from the claim text.