Liquid-crystalline medium

US5480581A · kind A · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Herbert Plach · Darmstadt, DE
• Ulrich Finkenzeller · Plankstadt, DE
• Volker Reiffenrath · Roßdorf, DE
• Eike Poetsch · Mühltal, DE
• Bernhard Rieger · Langenau, DE
• Hiroshi Numata · Yokohama, JP

Key dates

• Filing date: Apr 7, 1994
• Grant date: Jan 2, 1996
• Expiry date: Apr 7, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2019/3021
• 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 X is fluorine, chlorine, CF.sub.3, OCF.sub.3 or OCHF.sub.2, ring A is trans-1,4-cyclohexylene or 1,4-phenylene, and R is alkyl, oxaalkyl, fluoroalkyl or alkenyl, in each case having up to 7 carbon atoms.