PIGMENT DISPERSIONS CONTAINING DISPERSANTS HAVING PENDENT HYDROPHILIC POLYMERIC SEGMENTS PREPARED BY CONTROLLED RADICAL POLYMERIZATION

摘要

A pigment dispersion comprising pigment, an aqueous carrier selected from water and a mixture of water and at least one organic solvent, and a pigment dispersant is described. The pigment dispersant is prepared by polymerizing (i) at least one prepolymer having a radically polymerizable group, and (ii) at least one second monomer. The prepolymer is prepared by controlled radica l polymerization, e.g., atom transfer radical polymerization, of at least one radically polymerizable first monomer. The second monomer forms a polymeric backbone segment of the pigment dispersant, and the prepolymer forms polymer ic segments that are pendent to the backbone. The backbone segment of the pigme nt dispersant in hydrophobic, while at least a portion of each pendent polymeri c segment is hydrophilic.