Liquid-crystalline allenes

US5695681A · kind A · utility

Assignee

• BASF SE

Inventors

• Karl Siemensmeyer · Bischofswerda, DE
• Carsten Tschierske · Bodenwerder, DE
• Kerstin Zab · Bodenwerder, DE

Key dates

• Filing date: Mar 27, 1996
• Grant date: Dec 9, 1997
• Expiry date: Mar 27, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2323/027
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Liquid-crystalline allenes of the formula I ##STR1## where M is a mesogenic group, PA0 R.sup.1 and R.sup.2 are hydrogen or a C-organic radical having 1-8 carbon atoms, PA0 R.sup.3 is a C-organic radical having 1-30 carbon atoms, PA0 X.sup.1 is --(CH.sub.2).sub.q --O--(CH.sub.2).sub.p --, PA0 --(CH.sub.2).sub.q --NR.sup.4 --(CH.sub.2).sub.p --, PA0 --(CH.sub.2).sub.q --CO--O--(CH.sub.2).sub.p --, PA0 --(CH.sub.2).sub.q --O--CO--(CH.sub.2).sub.p --, PA0 --(CH.sub.2).sub.q --CO--NR.sup.4 --(CH.sub.2).sub.p -- or PA0 --(CH.sub.2).sub.q --NR.sup.4 --CO--(CH.sub.2).sub.p --, PA0 R.sup.4 is hydrogen or an alkyl radical having 1-4 carbon atoms, PA0 p is from 1 to 20, and PA0 q is from 0 to 20, where the definitions of R.sup.2 and R.sup.3 can also be interchanged, are used in optical display elements.