Polymeric-coated dielectric particles and formulation and...

C - Chemistry – Metallurgy – 08 – K

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C08K 9/04 (2006.01) C09B 67/08 (2006.01) G03G 17/04 (2006.01) G02F 1/167 (2006.01)

Patent

CA 2282603

Properly-coated pigment particles for use in an electrophoretic display include pigment particles having a pre-determined density and application of a polymeric coating to the pigment particles, wherein the coating comprises a near fluoropolymer, and wherein the density of the fluoropolymer is substantially the same as the density of the pigment particles. When a polymeric coating is applied having a density that is substantially the same as the density of the pigment particles, even though the particles comprise a distribution of particle sizes, the density of the pigment particles is not significantly altered. In a preferred embodiment, the pigment particle comprises a diarylide yellow pigment, having a density of 1.43 g/ml, coated with a polymer made from the monomer 2,3,4,5,6-Pentafluorostyrene, having a density of 1.41 g/ml.

On décrit des particules de pigment enrobées de manière appropriée, destinées à être utilisées dans un affichage électrophorétique, qui comprennent des particules de pigment d'une densité prédéterminée, et l'application d'un revêtement polymère sur les particules de pigment, ledit revêtement comprenant un quasi-fluoropolymère dont la densité est sensiblement identique à celle des particules de pigment. Quand on applique un revêtement polymère d'une densité sensiblement identique à celle des particules de pigment même lorsque les particules présentent une distribution de grosseurs particulaires, la densité des particules de pigment n'est pas significativement modifiée. Dans une forme de réalisation préférée, la particule de pigment comprend un pigment jaune de diarylide d'une densité de 1.43 g/ml, enrobé d'un polymère obtenu à partir du monomère 2, 3, 4, 5, 6-Pentafluorostyrène d'une densité de 1.41 g/ml.

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