Liquid-crystalline compounds, and liquid-crystalline medium

US6146719A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Eike Poetsch · Mühltal, DE
• Brigitte Schuler · Großostheim, DE
• Michael Heckmeier · Bensheim, DE
• Volker Reiffenrath · Roßdorf, DE
• Werner Binder · Dieburg, DE
• Joachim Krause · Dieburg, DE

Key dates

• Filing date: Sep 25, 1999
• Grant date: Nov 14, 2000
• Expiry date: Sep 25, 2019

Classification

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

Abstract

A liquid-crystalline medium based on a mixture of polar compounds of positive dielectric anisotropy, including one or more compounds of the general formula I: ##STR1## in which, R is H, an alkyl or alkenyl radical having 1 or 2 to 15 carbon atoms respectively which is unsubstituted, monosubstituted by CN or .sub.CF. 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, PA1 m is 0 or 1, PA1 n is 0, 1 or 2, and PA1 m+n is 1, 2 or 3.