| 摘要 |
Heat curable, cathodically depositable, aqueous coating compositions comprising an aqueous emulsion of 98 to 50 percent by weight, preferably 95 to 70 percent by weight, of one or more self-crosslinking cationic binders based on modified epoxy compounds, water-soluble upon partial or total neutralization with an inorganic or organic acid, and 2 to 50 percent by weight, preferably 5 to 30 percent by weight, of a di- and/or triurethane having the formula - <IMAGE> wherein R represents an aromatic, cycloaliphatic, or aliphatic hydrocarbon radical; R1 stands for a hydroxyethyl(meth)acrylate or a hydroxypropyl(meth)acrylate radical; R2 is the radical of a saturated and/or unsaturated aliphatic monoalcohol with at least 6 carbon atoms and/or an alkyl or alkylene radical with at least 6 carbon atoms, and n is an integer of 1 or 2. The coating compositions cure at low temperatures and short curing times to provide films having excellent resistance to water, chemicals, and corrosion; and have good leveling characteristics and good adherence to diverse substrates.
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