We developed an encapsulated pigment using a coacervation method in order to have fine pigment dispersion in silicone oil and to add some functions on the surface of pigments. Poly-(dimethylsiloxane)-grafted acrylic polymer was used as a polymer for the encapsulation. A dispersion of the encapsulated pigments with the mean particle diameter of less than 200 nm was prepared. The dispersion had higher zeta potential compared with those prepared using conventional dispersants, which suggested a possibility of the addition of new functions on the surface of pigments. The viscosity of the dispersion was low, and its storage stability was improved by cross-linking of the polymer. All CMYK colored pigments, of which surface property was different, were encapsulated, resulted in the identical surface property with that of the polymer layer.
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