Preparation and performance of green encapsulated electrophoretic ink

Pigment phthalocynine green G modified with octadcylamine was suspended in tetra-chloroethylene using span 80 as emulsifier, and this suspending fluid has showed superior dispersibility and stability. Urea-formaldehyde microcapsules containing the suspending fluid as the core material were prepared by in situ polymerization. The solid content in the core materials was controlled through the apparent density of the particles. Oil-soluble emulsifier can provide good stability and emulsion to the internal phase, and no side effect to the resin's deposition on the capsule surface. During the micro-encapsulated process, the prepolymer condensed to form UF particles in the aqueous solution, then the particles aggregated and deposited at the surface of internal phase. After investigated in an electric field, it was found that pigment phthalocynine green G modified with octadcylamine moved in the capsule, but they were irreversible.