Coloured particles for electrophoretic displays

摘要

This invention relates to colored polymer particles preferably with surface functionality for charge retention, a process for their preparation, the use of these particles for the preparation of an electrophoretic device, and to color electrophoretic displays comprising such particles.

主权项

1. A process for the preparation of colored polymer particles for use in electrophoretic devices, comprising the steps of:
a) preparing polymer particles, b) coloring the polymer particles by addition of at least one polymerizable dye, c) polymerizing the polymerizable dye, and optionally d) washing and drying the colored polymer particles, wherein the polymerizable dye is Disperse Red 1 methacrylate or acrylate, Disperse Yellow 7 methacrylate or acrylate, a dye of formula 1, a dye of Formula 2 or a dye of formula 3: wherein R1,R2,R3,R5 and R7=alkyl,R4, R6 and R8=H or CH3,Hal=halogen,A−=a halogen or monobasic acid (oxo) anion.