Nematic liquid-crystalline phases

US4871469A · kind A · utility

Assignee

• BESCHRAENKTER HAFTUNG · DE

Inventors

• Volker Reiffenrath · Roßdorf, DE
• Joachim Krause · Dieburg, DE
• Thomas Geelhaar · Mainz, DE
• Rudolf Eidenschink · Mainz, DE
• Hans-Adolf Kurmeier · Seeheim-Jugenheim, DE
• Eike Poetsch · Mühltal, DE
• Bernhard Scheuble · Alsbach, DE
• Georg Weber · Langen (Hessen), DE

Key dates

• Filing date: Jan 4, 1988
• Grant date: Oct 3, 1989
• Expiry date: Jan 4, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2019/3422
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to the use of trifluorotoluene derivatives of the formula I ##STR1## in which R.sup.1 is alkyl having 1 to 12 carbon atoms in which, in addition, one or more non-neighboring CH.sub.2 groups may be replaced by --O--, --CO--, --O--CO--, --CO--O--, --O--CO--O--, --CH-halogen, --CH--CN-and/or --CH=CH--, PA1 A.sup.1 and A.sup.2, in each case independently of one another, are 1,4-phenylene in which, in addition, one or more CH groups may be replaced by N, trans-1,4-cyclohexylene in which, in addition, one or two non-neighboring CH.sub.2 groups may be replaced by --O--and/or --S--, or 1,4-bicyclo(2,2,2)octylene, each of which is unsubstituted or monosubstituted or poly-substituted by halogen, nitrile and/or CH.sub.3, PA1 Z.sup.1 and Z.sup.2, in each case independently of one another, are --CO--O--, --O--CO--, --CH.sub.2 O--, --OCH.sub.2 --, --CH.sub.2 CH.sub.2 -- or a single bond, and PA1 n is 0 or 1, as components of chiral tilted smectic phases.