PREPARATION OF FLAME-RESISTANT SOFT POLYURETHANE FOAMS OF REDUCED SMOKE DENSITY, AND MELAMINE/EXPANDABLE GRAPHITE/POLYETHER-POLYOL DISPERSIONS FOR THIS PURPOSE

摘要

A process for the preparationof flame-resistant soft polyurethane foams which produceless smoke in the event of fire involves reactinga) an organic polyisocyanate and/or a modified organicpolyisocyanate withb) a high-molecular-weight compound containing at leasttwo reactive hydrogen atoms and, if desired,c) a chain extender and/or crosslinking agent,in the presence ofd) a mixture of flameproofing agents which contains:di) melaminedii) expandable graphite and, if desired,diii) at least one further flameproofing agent,preferably a modified or unmodifiedammonium polyphosphate,e) a blowing agent,f) a catalystand, if desired,g) assistants and/or additives,and melamine/expandable graphite/polyether-polyoldispersions which are suitable for this purpose.