Patent ID: 6395827
Filing Date: 2002-05-28
Classification: C08G

Abstract:
Aqueous crosslinkable coating composition comprising:(A) an aqueous dispersion of at least one vinyl polymer which is hydroxyl- and acid-functional, said aqueous dispersion being a dispersion of said at least one vinyl polymer in a liquid carrier medium at least 50% by weight of which is water, and in which: (i) said at least one polymer has a hydroxyl value within the range of from 8 to 250 mg KOH/g of solid polymer; (i) said at least one vinyl polymer has an acid value within the range of from 2 to 55 mg KOH/g of solid polymer, where the contribution of at least 30% of the acid value results from the acid groups of polymerised units in the vinyl polymer of a monocarboxylic acid(s) of formula: CH2&boxH;CR1â€”Qâ€”CO2Hâ€ƒâ€ƒ(1) â€ƒwhere R1 is H or lower alkyl of 1 to 5 carbon atoms and Q is a non carboxyl-containing spacer group providing a spacer chain of at least 3 atoms, wherein the spacer group Q is of the formula: [â€”C(&boxH;O)â€”Xâ€”(CH2)mâ€”]kâ€ƒâ€ƒ(2) where X is â€”Oâ€” or â€”NHâ€”, m is at least 1 and k is at least 1; and (B) at least one organic polyisocyanate.