CONTINUOUS PROCESS FOR THE PRODUCTION OF AQUEOUS POLYURETHANE-UREA DISPERSIONS

摘要

Mo-2712-CIP PU-174-CIP CONTINUOUS PROCESS FOR THE PRODUCTION OF AQUEOUS POLYURETHANE-UREA DISPERSIONS The present invention is directed to a continuous process for the production of aqueous polyurethane-urea dispersions by a) mixing an emulsifiable isocyanate- terminated prepolymer with an aqueous medium in a low shear, stator-rotor dynamic mixer operating at a speed of about 500 to 8000 rpm utilizing a mixing wattage of about 0.3 to 10.0 watts/cubic centimeter and a mixing volume of at least about 0.1 liters, the average residence time of the aqueous medium and the prepolymer being about 1 to 30 seconds and the overall flow rate through the dynamic mixer being at least about 50 kg/h and b) reacting the dispersed isocyanate- terminated prepolymer prepared in (a) with a polyamine chain extender to form an aqueous polyurethane-urea dispersion. Mo-2712-CIP