Ferroelectric liquid-crystal mixtures containing mercapto compounds

US5250215A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Michael Magerstadt · Hofheim, DE
• Norbert Rosch · Frankfurt am Main, DE
• Rainer Wingen · Hattersheim, DE

Key dates

• Filing date: Aug 7, 1991
• Grant date: Oct 5, 1993
• Expiry date: Aug 7, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K19/582
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A liquid-crystalline mixture comprising at least two components, the first being an aromatic mercapto compound of the formula (I) ##STR1## R.sup.1, R.sup.2, R.sup.3 and R.sup.4, independently of one another, are hydrogen, alkyl having 1 to 8 carbon atoms or alkoxy having 1 to 8 carbon atoms, PA0 --X-- is --O--, --S-- or --NH--, PA0 k and m, independently of one another, are 1, 2, or 3, and PA0 l is zero or 1, results in high contrasts in electrooptical switching and display devices.