Encapsulated dispersions comprising electrophoretically...

G - Physics – 02 – F

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G02F 1/167 (2006.01) C09B 67/00 (2006.01)

Patent

CA 2698832

The invention relates to 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 a cationic pigment orcationic pigment derivative, and the dispersantis selected from the group consisting of polyacrylates, polyesters, polyurethanes and copolymers, with the proviso that the cationic pigment or cationic pigment derivative is not a reaction product of carbonblack with diazotated procaine hydrochloride. In general, the whole quantity of the pigment and the main part, preferably at least 80%, most preferred from 95% to 100%, of the whole cationic pigment or cationic pigment derivativepresent within the cells is comprised in the aggregates, with essentially no pigment and only a minor part of the cationic pigment or cationic pigment derivative physically distinct from the aggregates.

L'invention concerne un affichage électrophorétique, comprenant des électrodes et des cellules contenant au moins un type de particules ioniques monochromes, un liquide non polaire et un dispersant, les particules ioniques monochromes d'au moins un genre étant essentiellement des agrégats comprenant un pigment contenant du carbone et un pigment cationique ou un dérivé de pigment cationique, et le dispersant étant choisi dans le groupe comprenant polyacrylates, polyesters, polyuréthanes et copolymères, à la condition que le pigment cationique ou dérivé de pigment cationique ne soit pas un produit réactionnel du noir de carbone avec de l'hydrochlorure de procaïne diazoté. En général, la quantité totale du pigment et la partie principale, de préférence, au moins 80 %, encore mieux, de 95 % à 100 %, de tout le pigment cationique ou dérivé de pigment cationique présent à l'intérieur des cellules, est comprise dans les agrégats, essentiellement aucun pigment et seule une partie infime du pigment cationique ou dérivé de pigment cationique se distinguant physiquement des agrégats.

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