Liquid crystalline medium

US5397505A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Bernhard Rieger · Langenau, DE
• Hiroki Yoshitake · Atsugi, JP
• Thomas Jacob · Kanchinakote, IN
• Herbert Plach · Darmstadt, DE
• Ulrich Finkenzeller · Plankstadt, DE
• Hans-Adolf Kurmeier · Seeheim-Jugenheim, DE

Key dates

• Filing date: Jan 18, 1994
• Grant date: Mar 14, 1995
• Expiry date: Jan 18, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K19/2007
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a liquid-crystalline medium based on a mixture of polar compounds having positive dielectric anisotropy, characterized in that it contains one or more compounds of the general formula I ##STR1## in which r is o or 1, Q.sup.1 is --CH.sub.2 CH.sub.2 -- or a single bond, A is 1,4-phenylene or trans-1,4-cyclohexylene, L is H or F, R is alkyl, alkoxy, oxaalkyl, fluoroalkyl or alkenyl, in each case having up to 7 carbon atoms and X is F, CF.sub.3, or OCF.sub.2 H.