| abstract |
Described is a pigment dispersion which is useful for electrophoretic displays comprising ( α )a bis-oxodihydro-indolylene-benzodifuranone colourant of the formula I wherein the substituents are defined as in claim 1, ( β )a specific polymeric dispersant, and ( γ )a solvent which is suitable for dispersions used in electrophoretic displays. Also described are novel colourants and dispersants. |