Liquid-crystalline medium

US6287648A · kind A · utility

Assignee

• Merck Patentgesellschaft · DE

Inventors

• Kazuaki Tarumi · Seeheim-Jugenheim, DE
• Peer Kirsch · Darmstadt, DE
• Sabine Schoen · Darmstadt, DE
• Dagmar Klement · Groß-Zimmern, DE

Key dates

• Filing date: Dec 22, 1999
• Grant date: Sep 11, 2001
• Expiry date: Dec 22, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2323/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, containing at least one compound of the general formula I ##STR1## in which R.sup.1 and R.sup.2 are each, independently of one another, an alkyl or alkenyl radical having 1 to 12 carbon atoms which is unsubstituted, monosubstituted by CN or CF.sub.3 or at least monosubstituted by halogen, where one or more CH.sub.2 groups in these radicals may also, in each case independently of one another, be replaced by --O--, --S--, ##STR2## --CO--, --CO--O--, --O--CO-- or --O--CO--O-- in such a way that O atoms are not linked directly to one another and u is 1 or 2.