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PPG Patents Decorative Coating with Homogeneous Hue

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By: KERRY PIANOFORTE

Editor, Coatings World, Coatings World

U.S. 8,178,160 B2
PPG Industries has been granted a patent for a method for preparing a decorative and durable coating having a homogeneous hue comprised of dry-blend mixing a first powder coating composition having a first hue and a second powder coating composition having a second hue different than the first hue to form a heterogeneous association of the first powder coating and the second powder coating; and directly applying the heterogeneous association of the first powder coating composition and the second powder coating composition to at least a portion of a substrate, wherein the first powder coating and/or the second powder coating is comprised of a particulate film-forming resin and polymer-enclosed color-imparting nanoparticles, the color-imparting nanoparticles having average particle size of 300 nanometers or less, wherein the particulate film-forming resin is comprised of an epoxy functional resin, wherein the polymer-enclosed color-imparting nanoparticles are enclosed by a polymer different from the particulate film-forming resin, wherein the polymer-enclosed color-imparting nanoparticles comprised of a polymer comprised of the reaction product of an ethylenically unsaturated water-dispersible polymerizable dispersant, and an ethylenically unsaturated monomer, and wherein the water-dispersible polymerizable dispersant comprised of a polymer selected from the group consisting of polyurethane polymers, polyester polymers, polyether polymers, silicon-based polymers, co-polymers thereof and mixtures thereof.

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