PROCESS FOR PRODUCING PLASTIC FOAMS, IN PARTICULAR POLYURETHANE PLASTIC FOAMS

摘要

For the manufacture of fluorohydrocarbon-free foamed plastics, more particularly polyurethane foamed plastics, pure nitrogen is employed as expanding agent which is obtained by means of the simultaneous, binary reaction of the ions NH4 + and NO2 - of two solutions which form NH4 + and NO2 - ions comprising ammonium salts and alkali nitrites, such as ammonium chloride or ammonium sulfate solution and sodium nitrite or potassium nitrite solution.