| abstract |
An anthraquinone dye free from water-solubilising and ionic substituents of the general formula:n wherein Q is NH 2 , OH, alkyl, aryl, N0 2 or halo; n is 0 to 4; each X independently is H, -SR, -NZ 1 Z 2 or Q: each R independently is alkyl, aryl or cycloalkyl; Z 1 & Z 2 are independently H, alkyl, cycloalkyl or aryl; provided that there are at least two different -SR groups and that where only two X's represent -SR groups at least one R is aryl and the two -SR groups are in the 1 & 5 or the 1 & 8 positions. In addition to the normal textile applications the dye is suitable for use in the colouration of liquid crystals for electro-optic displays. |