Patent ID: 7226550
Filing Date: 2007-06-05
Classification: C08G,C08L,C09B,C09D,C09J,G02F

Abstract:
1. A method for inducing or enhancing the threshold voltage of an electrophoretic display, which method comprises a) preparing an electrophoretic fluid comprising forming pigment containing microparticles via emulsifying an internal phase comprising primary pigment particles and a reactive monomer or oligomer into a continuous phase comprising a protective colloid and dispersing the pigment-containing microparticles in a dielectric solvent or solvent mixture; and b) adding to said electrophoretic fluid a threshold promoter represented by the following formula: wherein: m is a natural number which is ≧1; q is a natural number which is ≧1; R is a halogenated group or a halogenated polymeric or oligomeric chain; Q and L together forms a linking chain; and X is a functional group capable of forming hydrogen bonding, acid-base interaction, donor-acceptor interaction, metal-ligand interaction or Coulombic interaction.