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BASF Coatings patents AQUEOUS COATING Material

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By: KERRY PIANOFORTE

Editor, Coatings World, Coatings World

Patent No. U.S. 7,479,520 B2
    
BASF Coatings AG has received a patent for an aqueous coating material that is substantially or completely free from volatile organic compounds. It is  comprised of a mixture of from 50% to 95% by weight of at least one aqueous primary dispersion comprising a polymer having a diameter <500 nm comprised a controlled free-radical micro­emulsion or miniemulsion polymerization product of at least one olefinically unsaturated monomer in the presence of at least one hydrophobic additive, wherein the polymer is at least one of a dispersed solid polymer particle, an emulsified solid polymer particle, a dispersed liquid polymer particle, an emulsified liquid polymer particle, and a dispersed solid core-shell particle, and from five to 50% by weight of at least one secondary aqueous polyurethane dispersion comprising at least one polyurethane and at least one light stabilizer that is at least one of a regenerable free-radical scavenger, all percents by weight based on the aqueous coating material.

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