| 摘要 |
<p>To prepare a flexible coating material, di- and/or trifunctional polyols are advanced with diisocyanates in a molar ratio of polyol/diisocyanate = (n+1)/n; these advanced polyols are reacted in a ratio of 1:2 with polyisocyanates, advantageously with excess polyisocyanates, to give chains having terminal NCO groups, which on application of the coating material to a substrate material react under the action of atmospheric humidity, electron beams or diamines and lead to a flexible, very firmly adherent film on the substrate material.</p> |
