| 摘要 |
AN AQUEOUS COATING COMPOSITION AND ITS USE FOR COATING SUBSTRATES The present invention relates to aqueous coating compositions containing an aqueous solution and/or dispersion of a) a polyacrylate component which contains at least one copolymer having carboxylic and/or sulphonic acid groups which may be at least partially present in salt form, is based on the reaction product of olefinically unsaturated monomers and has an acid number of 30 to 240 mg KOH/g, a hydroxyl number of O to 180 mg KOH/g, and a molecular weight (Mn) of 500 to 50,000, b) an epoxide component which contains b1) at least one aliphatic or cycloaliphatic epoxy resin having an average of at least 2 epoxide groups per molecule and containing 0.2 to 2.0 equivalents of epoxide per 100 g of resin and b2) up to 20 wt.%, based on the weight of b1), of at least one aliphatic monoepoxide with 7 to 25 carbon atoms, c) up to 10 wt.%, based on the total weight of components a) to e), of one or more organic, water-miscible solvents, d) up to 5 wt.%, based on the total weight of components a) to e), of one or more external emulsifiers and e) optionally other known coatings additives, wherein the equivalent ratio of unneutralized acid groups of component a) to epoxide groups of component b) is 1:0.5 to 1:3. The present invention also relates to the use of these coating compositions for the production of coatings for curing at 5 to 140.degree.C on any desired substrates.
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