| 摘要 |
<p>The present invention relates to a method for producing polyurethane foams from A1 compounds having isocyanate-reactive hydrogen atoms and a molecular weight from 400 to 15,000, A2 optionally compounds having isocyanate-reactive hydrogen atoms and a molecular weight from 62 to 399, A3 water and/or physical blowing agents, A4 optionally auxiliaries and additives, A5 compounds having at least one semicarbazide group, and B diisocyanates or polyisocyanates, which results in polyurethane foams having lowered formaldehyde emission, and wherein the activity of the raw material mixture is not significantly affected and the mechanical properties of the resulting foam (in particular compression set and ageing behaviour under humid conditions) are not adversely affected.</p> |
