| 摘要 |
<p>A method of producing one-component polyurethane varnishes for application on metal bands, characterized in that polyesters with a OH functionality of at least 2, an OH number of 70 - 150 mg KOH/g and a molecular weight of about 800 - 2500, from o-, m- and/or p-benzenedicarbolyllc acids and/or 1,2,5- or 1,3,5-benzenetricarboxylic acids or their alkyl esters with 1 - 4 C atoms with trifunctional alcohols and/or glycols, are converted with cycloaliphatic polyisocyanates blocked by means of dimethylketoxime, in the equivalent ratio of OH groups to blocked isocyanate groups of 1.0 : 0.7 to 1.0 : 1.1, especially 1.0 : 1.0 and resultant products.</p> |
