Meta-substituted aromatic compounds having six-membered rings, for use in liquid-crystal mixtures

US5447656A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Dietmar Jungbauer · Weiterstadt, DE
• Hubert Schlosser · Hofheim, DE

Key dates

• Filing date: Jul 7, 1993
• Grant date: Sep 5, 1995
• Expiry date: Jul 7, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K19/3497
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Meta-substituted aromatic compounds having six-membered rings, for use in liquid-crystal mixtures Compounds of the formula I ##STR1## in which X is CH, CF or N, PA1 R.sup.2 is, for example, an alkyl, ether or ester group, which may also contain a chiral center, and PA1 R.sup.1 (--A.sup.1).sub.a (--M.sup.1).sub.b (--A.sup.2).sub.c (--M.sup.2) .sub.d (--A.sub.3).sub.e (--M.sub.3).sub.f is a mesogenic radical, can advantageously be used as components of liquid-crystal mixtures, in particular ferroelectric liquid-crystal mixtures. The substances of the formula I have a particularly favorable effect on the optical switching angle and the critical pulse area of the mixtures.