Patent ID: 7303818

Claim:
Electrophoretic particles, each of which has a salt at a surface thereof, said salt comprising an acid-derived anionic group and any one of cationic compounds represented by the following formulas (1) to (4): wherein R1 and R2 independently denote a linear or branched alkyl group having 1-18 carbon atoms; wherein R3 denotes a linear or branched alkyl group having 4-18 carbon atoms, and R4 denotes a linear or branched alkyl group having 1-18 carbon atoms; wherein R5, R6, R7 and R8 independently denote a linear or branched alkyl group having 6-18 carbon atoms; and wherein R9, R10 and R11 independently denote a linear or branched alkyl group having 4-18 carbon atoms.