Surface-treated organic pigments

摘要

This invention relates to a pigment composition prepared by a process comprising
(a) treating an organic pigment with
(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,
thereby 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.