Pigment compositions and methods of preparation

摘要

Easily-dispersible pigment compositions suitable for the coloration of aqueous coating systems are prepared by contacting an aqueous slurry of the pigment with an alkaline solution of an acid resin and acidifying the mixture to insolubilize the resin. A pigment-resin composite is produced in which the pigment particles are effectively coated with the resin. On subsequently contacting the pigment-resin composite with a base, optionally in the vapor phase, the resin is neutralized and the pigment rendered easily dispersible in aqueous coating systems.