C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 175/08 (2006.01)
Patent
CA 2059190
Mo3477 MD-90-24-PU TWO-COMPONENT AQUEOUS POLYURETHANE DISPERSIONS WITH REDUCED SOLVENT CONTENT AND COATINGS PREPARED THEREFROM WITH IMPROVED GLOSS ABSTRACT OF THE DISCLOSURE The present invention relates to a two-component, aqueous polyurethane coating composition which may be cured at ambient temperature and which contains I) a first component based on an aqueously dispersed polyurethane wherein the polyurethane has a) an average hydroxy functionality of at least 1.8, b) a total content of urethane and urea groups, calculated as -NH-C-O-, of 9 to 20% by weight, based on the weight of the polyurethane, c) sufficient chemically incorporated anionic groups and d) ethylene oxide units incorporated within terminal and/or lateral polyether chains to maintain the polyurethane stably dispersed in water, II) a second component based on a water dispersible polyisocyanate wherein the polyisocyanate has a) an isocyanate content of 2 to 30% by weight, based on the weight of the polyisocyanate, b) an average functionality of at least 1.8, c) sufficient chemically incorporated anionic groups and d) ethylene oxide units incorporated within terminal and/or lateral polyether chains, to maintain the polyisocyanate stably dispersed in water, and components I and II are present in an amount sufficient to provide an equivalent ratio of isocyanate groups to hydroxyl groups of 0.8:1 to 4:1, and III) 5 to 20%, based on the weight of components I and II, of a polyol which has a molecular weight of 62 to 1000 and may contain ether groups. The present invention is also directed to the coatings prepared from these coating compositions. Mo3477
de Gagne Jacqueline A.
Miles Inc.
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