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Kansai Paint patents water-based paint

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By: KERRY PIANOFORTE

Editor, Coatings World, Coatings World

Patent No. U.S. 7,842,751 B2
Kansai Paint Co. has obtained a patent for a water-based paint composition comprised of an emulsion resin, melamine resin and hydrophobic solvent, wherein: the emulsion resin is fine resin particles having core/shell type multilayered structure composed of the core made of a copolymer obtained by copolymerization of 0.1-30% mass  of polymerizable unsaturated monomer having at least two polymerizable unsaturated groups per molecule and 70-99.9% mass of other polymerizable unsaturated monomer, and the shell made of a copolymer obtained by copolymerization of 5-50% mass of vinyl aromatic compound and 50-95% mass  of other polymerizable unsaturated monomer, wherein the solid mass ratio of the copolymer/copolymer  is within a range of 10/90-90/10; the melamine resin has a weight-average molecular weight within a range of 1,000-5,000; the hydrophobic solvent is an alcoholic solvent; and the water-based paint composition is comprised of the emulsion resin within a range of 10-80 mass parts, the melamine resin within a range of 5-50 mass parts, and the hydrophobic solvent within a range of 10-100 mass parts, per 100 mass parts of solid resin content in the water-based paint composition.

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