Smectic liquid-crystal mixture

US5443752A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Barbara Hornung · Hasselroth, DE
• Dietmar Jungbauer · Weiterstadt, DE
• Javier Manero · Frankfurt, DE

Key dates

• Filing date: Apr 7, 1994
• Grant date: Aug 22, 1995
• Expiry date: Apr 7, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K19/46
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A smectic liquid-crystal mixture comprising PA0 A. at least one compound of the formula (I) ##STR1## B. at least one compound of the formula (III) ##STR2## C. compounds of the formula (IV) EQU R.sup.1 --O--CO--O--(--A.sup.1).sub.a (--M.sup.1).sub.b (--A.sup.2).sub.c (--M.sup.2).sub.d (--A.sup.3).sub.e (--O).sub.f --R.sup.2 (IV) in which: PA1 R.sup.1 and R.sup.2 are identical or different and are a straight-chain or branched alkyl group having 1 to 22 or 3 to 22 carbon atoms respectively, PA1 A.sup.1, A.sup.2 and A.sup.3 are identical or different and are 1,4-phenylene, where one or two H atoms may also be replaced by F, 2,5-pyrimidinediyl, and further smectogenic compounds and, if desired, dopants. The mixture exhibits a low melting point and a broad S.sub.c phase.