Patent ID: 6034156
Filing Date: 2000-03-07
Classification: C09B,C09D

Abstract:
A method for the production of a solid particulate pigment/resin dispersion which comprises the steps of:(i) mixing and kneading together:(a) a solid film-forming resin carrier;(b) a water-immiscible volatile organic liquid which is a solvent or partial solvent for the resin;(c) a particulate pigment;(d) water; and optionally,(e) a water-miscible solvent;until the mixture separates into an aqueous phase comprising largely water and a coherent mass comprising resin, organic solvent and pigment;(ii) separating the aqueous phase from the coherent mass; and(iii) continuing to mix and knead the coherent mass whilst removing organic solvent therefrom under the action of heat at a temperature of from about 55.degree. C. to 75.degree. C. until the coherent mass breaks down to form a dry particulate material comprising said pigment resin dispersion.