Use of polyaryl ether ketones as alignment layers

US5166304A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Hans-Rolf Dubal · Königstein, DE
• Mikio Murakami · Kakegawa, JP
• Hans-Otto Drotloff · Frankfurt am Main, DE
• Michael-Joachim Brekner · Frankfurt am Main, DE

Key dates

• Filing date: Jan 23, 1991
• Grant date: Nov 24, 1992
• Expiry date: Jan 23, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2323/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Use of polyaryl ether ketones comprising structural units --O--A--O--B-- gives alignment layers for liquid-crystal display and switching devices which have high transparency, low water absorption capacity and particularly uniform alignment both of smectic and of nematic liquid crystals, and thus produce a high contrast capability.