| 摘要 |
Baking lacquers on the basis of a blend of hydroxy-group-containing polymers, blocked polyisocyanates and organic solvents which comprise 40-70 wt. % hydroxy-group-containing polymers with hydroxy numbers between 40 and 240 and polyisocyanates blocked with cyclic amidines of the formula: <IMAGE> wherein R are equal or different substituents selected from the group of hydrogen, alkyl-, cycloalkyl-, aralkyl- and aryl radicals, whereby the components are used in such amounts that 0.8 to 1.2 NCO-group equivalents are applied for each hydroxy group equivalent, 0-2 wt. % cross-linking catalyst, 30-60 wt. % organic solvent or solvent mixture, wherein the percentages of polymer, catalyst and solvent add up to 100. Pigments, colorants, flowing agents, gloss improvers, antioxidants and heat stabilizers may also be added. The lacquers are used for coil-coating lacquering in weather resistant single and double layer lacquering.
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