| abstract |
R eine CH₂-Gruppe oder eine CH=CH-Gruppe darstellt, und/oder der Formel IIn wobein R¹ und R² unabhängig voneinander Wasserstoff oder Alkylreste mit 1 bis 6 Kohlenstoffatomen, deren Wasserstoffatome teilweise durch OH-Gruppen substituiert sein können, darstellen, einsetzt.The invention relates to a process for the production of moldings with a bulk density of at least 150 kg / m³ from polyurethane foams with a compact surface by foaming a polyurethane-forming starting mixture, using compounds of the formula I as blowing agents HOOC-R-COOH I in which R represents a CH₂ group or a CH = CH group, and / or the formula II in which R1 and R2 independently of one another represent hydrogen or alkyl radicals having 1 to 6 carbon atoms, the hydrogen atoms of which can be partially substituted by OH groups, starts. |