Process for the production of moldings of polyurethane foams

摘要

The present invention relates to a process for the production of polyurethane foam moldings having a compact surface skin and a density of at least 150 kg/m3 comprising foaming a polyurethane-forming starting mixture inside a mold. The starting mixture comprises organic blowing agents which correspond to one or both of the following general formulas: HOOC-R-COOH(I) wherein: R represents a CH2 group or a CH=CH group; and <IMAGE> (II) wherein: R1 and R2 independently of one another represent either a hydrogen atom or a C1-6 alkyl radical wherein the hydrogen atoms may be partly substituted by OH groups.