The encapsulation of organic pigment (a copper phthalocyanine blue pigment) with polymer by co-sonication of copper phthalocyanine blue pigment dispersion and a typical miniemulsion polymerization was studied. The pigment containing polymer particles were analyzed in detail by particle size measurements, transmission electron microscopy, UV-Vis spectrophotometry and thermogravimetric analysis. The effect of the polymerization process and type of surfactant and co-surfactant in the efficiency of encapsulation were investigated. The pigment was first suspended into surfactant by sonication, before being encapsulated by miniemulsion polymerization using styrene as monomer and water soluble potassium persulfate as initiator. The final particle size was in the range of 67 to 157 nm. Dynamic light scattering measurements showed that the organic pigment could stabilize the miniemulsion droplets, and be thus satisfactorily encapsulated without introducing any other compound in the formulation.