Use of optically active oxirane-2-carboxylic acid esters as dopants in liquid-crystal mixtures, liquid-crystal mixtures containing same and novel optically active oxirane-2-carboxylic acid esters

US4988459A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Gunter Scherowsky · Berlin, DE
• Jurgen Gay · Berlin, DE
• Hans-Rolf Dubal · Königstein, DE
• Claus Escher · Mühltal, DE
• Wolfgang Hemmerling · Pocking, DE
• Ingrid Muller · Niedernhausen, DE
• Dieter Ohlendorf · Liederbach, DE
• Rainer Wingen · Hattersheim, DE

Key dates

• Filing date: May 26, 1988
• Grant date: Jan 29, 1991
• Expiry date: May 26, 2008

Classification

• Technology area (CPC G): Physics
• CPC primary: G02F1/37
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

Optically active oxirane-2-carboxylic acid esters with a mesogenic molecular component suitable as dopants in liquid-crystal mixtures. They result in liquid-crystalline ferroelectric phases with short switching times and in electroclinic phases with large electroclinic coefficients. A further advantage lies in the fact that they induce a helix with a very small pitch so that they are also suitable for helix compensation in LC mixtures.