METHOD OF PRODUCING CLOSED MOLD POLYURETHANE FOAM MOLDINGS FREE OF SURFACE VOIDS BY FLUSHING THE MOLD WITH A VAPORIZED HALOGENATED HYDROCARBON

摘要

Foamed polyurethane moldings free of surface voids and having a substantially uniform skin are formed in a closed mold which has been purged of air with a vaporized liquid halogenated hydrocarbon capable of condensing on the mold walls or dissolving in the molding composition at the temperature and pressure conditions used in molding.