Patent ID: 8575242

Claim:
A method of preparing a water-based paint comprising melting at least one acrylic resin, wherein said resin has an acidity number higher than 30, an average molecular weight of between 800 and 5000 Da and a melting point of between 75° and 130° C., wetting of the entire surface of pigment with the melted acrylic resin, extruding the mixture thus obtained, characterized in that extrusion is performed at an internal temperature of the extruder 5 to 20° C. higher than the melting temperature of the resin, cooling thereof and subsequent granulation in the wet state and drying, to obtain a granule composition comprising pigments coated with said at least one acrylic resin, wherein the granule composition contains from 80 to 20% by weight of said pigment and from 80 to 20% by weight of said acrylic resin, wherein the granule composition defines granules having a diameter from 1.0 to 2.2 mm, wherein the granule composition is dust-free, and adding the obtained granule composition to a water-based formulation having a basic pH.