Patent ID: 8040592

Claim:
An electrophoretic display, comprising electrodes and cells containing at least one kind of ionic, monochrome particles, a non-polar liquid and a dispersant, wherein the ionic, monochrome particles of at least one kind are essentially aggregates consisting of a carbon containing pigment and an anionic pigment or anionic pigment derivative, and the dispersant wherein the dispersant comprises polar as well as apolar or low polar ingredients selected from the group consisting of ingredients comprising a nitrogen atom and ingredients comprising an aromatic ring, and the apolar or low polar ingredients are selected from the group consisting of acrylic acid esters, methacrylic acid esters, allyl esters and vinyl esters, the ester group of which comprises from 1 to 24 carbon atoms, allyl and vinyl C 1 -C 24 alkyl ethers, styrene, C 1 -C 24 alkyl-substituted styrenes, C 4 -C 12 lactones and hydroxy-C 2 -C 24 acids.