U.S. 8,575,242 B2
PPG has obtained a patent for a method of preparing a water-based paint comprised of melting at least one acrylic resin, wherein the 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 comprised of pigments coated with the at least one acrylic resin, wherein the granule composition contains from 80 to 20 percent by weight of the pigment and from 80 to 20 percent by weight of the 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.
PPG Patents Organic and Inorganic Pigments with Acrylic Resins
Published May 6, 2014
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