Patent ID: 6699528
Filing Date: 2004-03-02
Classification: C08G,C09D,Y10T

Abstract:
A process of imparting corrosion resistance to a substrate for use in a marine environment by coating said substrate with a polyurethaneurea, said process comprising:mixing a) an A-side of a polyurethaneurea coating comprising an isocyanate-terminated prepolymer prepared by reacting an excess of a diisocyanate with at least one hydrophobic polyoxyalkylene diol having a molecular weight of from 400 Da to 4000 Da; with b) a B-side containing a diamine and a hydrophobic polyoxyalkylene diol having a molecular weight determined by its hydroxyl number of from 200 Da to 4000 Da, in a weight ratio of diamine to hydrophobic polyoxyalkylene diol of from 1:10 to 10:1; to form a curable polyurethaneurea mixture having an NCO/OH ratio of from 0.85 to 1.15; c) spraying said curable mixture onto said substrate, and curing said mixture to form a polyurethaneurea coating on said substrate.