Liquid crystal materials containing anthraquinone dyes, and anthraquinone dyes

Abstract

Abstract 1. Liquid-crystalline material containing at least one anthraquinone dyestuff of the formula see diagramm : EP0074523,P10,F4 in which X represents H or see diagramm : EP0074523,P10,F6 it being possible for the rings A, B, C and D to carry 1, 2, 3, 4, or 5, preferably 1, 2 or 3, substituents from the series comprising alkyl which is optionally interrupted by -O-, -S- and/or -NR-, R denoting alkyl or aryl, cycloalkyl, aralkyl, alkoxy which is optionally interrupted by -O-, -S- or -NR-, R denoting alkyl or aryl, halogen, trifluoromethyl, nitro, optionally substituted amino, carboxylic acid derivative, sulphonic acid derivative or optionally substituted sulphonamide groups, wherein, in the case where X represents see diagramm : EP0074523,P10,F7 the four alpha-substituents on the anthraquinone ring are identical, and with the exception of 1,4,5,8-tetra(phenylthio)-anthraquinone and 1,4,5,8-tetra-(p-tert.-butylphenylthio)-anthraquinone.

Inventors

• 👤 Rütger Dr. Neeff
• 👤 Uwe Dr. Claussen

Bibliographic Details