METHOD OF PREPARING PIGMENTS Russian patent published in 2000 - IPC

FIELD: manufacture of paint materials, plastic materials, colored paper, building materials. SUBSTANCE: method comprises preparing suspension of original compounds during agitation, maintaining the suspension at 60-120 C for less than 1 hour, adding precipitating agent, precipitating the pigment, separating it from mother liquor and drying in flowing mode in the presence of carrier particles (carrier is metal from group consisting of zinc, aluminium or alloys thereof and which is resistant to attrition), adding the precipitating agent and simultaneously feeding air. Carrier particles are metal balls having diameter of 2-6 mm. EFFECT: improved quality, reduced power consumption and lower manufacturing cost of the resulting product, lower structural viscosity and higher stability of the suspension. 3 cl, 1 tbl