abstract |
This invention relates to a pigment composition prepared by a process comprisingn (a) treating an organic pigment withn (1) about 0.1 to about 100% by weight, relative to the organic pigment, of a sterically hindered and/or bulky primary amine, (2) 0 to about 100% by weight, relative to the organic pigment, of a surfactant, and (3) about 5 to about 15 parts by weight per part by weight of the organic pigment of a liquid in which the organic pigment is substantially insoluble, nthereby forming a suspension of the surface-treated pigment composition in the liquid; (b) exposing the suspension to cavitating conditions; and (c) collecting the pigment composition. |