Method for preparing preconditioned pigment particles

摘要

The present invention provides a method of preparing preconditioned pigment particles. A preferred method of the invention comprises: (a) grinding a pigment in a solution of a polyionic material to a particle size of 1.5 micrometers or smaller to obtain a dispersion, wherein the concentration of the polyionic material is sufficient to coat pigment particles, preferably from 0.01 % to 10 % (wt/vol); (b) filtering the solution with pigment particles; (c) washing the filtered pigment particles; and (d) drying the filtered pigment particles coated with the one or more polyionic materials.