Liquid-crystalline mixture containing an azulenesquaric acid dye

US5071588A · kind A · utility

Assignee

• BASF SE

Inventors

• Wolfgang Schrott · Cologne, DE
• Karin H. Beck · Ludwigshafen, DE
• Karl-Heinz Etzbach · Bischofswerda, DE
• Peter Neumann · Wiesloch, DE

Key dates

• Filing date: Sep 7, 1989
• Grant date: Dec 10, 1991
• Expiry date: Sep 7, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K19/60
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A liquid-crystalline mixture contains a liquid crystal composition and an azulenesquaric acid dye of the formula ##STR1## where R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 each have defined meanings, and is used for fabricating liquid crystal displays.