Liquid crystalline medium, e.g. for electrooptical applications, is based on a mixture of polar compounds with a positive dielectric anisotropy

摘要

A liquid crystalline medium is based on a mixture of polar compounds having a positive dielectric anisotropy. A liquid crystalline medium (I) is based on a mixture of polar compounds having a positive dielectric anisotropy comprising at least on compound of formula (1) and at least one compound of formula (2). [Image] [Image] R 1>2-8C alkenyl; a : 0 or 1; R 2>H or 1-15C alkyl, optionally halogenated or substituted by CN or CF 3 and optionally having CH 2 groups replaced by -CC-, -CO-, -CHCH-, -O-, structures of formula (3)-(5) such that O atoms are not directly bonded to each other; X 1>up to 6C alkyl, alkenyl, alkoxy or alkenyloxy or F, Cl, CN, SF 5, SCN, NCS or OCN when a is 1; X 2>F, Cl, CN, SF 5, SCN, NCS or OCN or optionally halogenated up to 6C alkyl, alkenyl, alkoxy or alkenyloxy; Z 1>, Z 2>-CF 2O-, -OCF 2- or a single bond when Z 1> does not equal Z 2>; A, B : a structure of formula (6) -(18); L 1>-L 4>H or F. [Image] [Image] [Image] [Image] An independent claim is included for an electrooptical liquid crystal display containing the medium (I).