The invention is directed to amphipathic polymeric particles that serve as
both the dispersant and the binder in water based inks, ink compositions
containing these particles, and methods for making the particles. The
polymeric particles contain both hydrophilic and hydrophobic moieties with
a pre-determined structure, and have an average diameter of 50 to 500 nm.
The amphipathic polymeric particles may be prepared by a side-chain
conversion method or a polymerization process involving an ATRP step, with
or without a cross-linking agent. This invention improves the stability of
polymer and inks by both ionic and steric stabilization of the suspended
polymer particles.
