Manufacture of flexible polyurethane foams utilizing polyether-polyisocyanate dispersion

Claim 1

IN THE PROCESS FOR THE PRODUCTION OF FLEXIBLE FOAMED POLYURETHANE MATERIALS BY THE INTERACTION OF AN ORGANIC POLYISOCYANATE COMPOSITION COMPRISING A MAJOR PROPORTION OF A DIARYLMETHANE DIISOCYANATE AND AT LEAST 5% BY WEIGHT OF A POLYISOCYANATE HAVING MORE THAN TWO ISOCYANATE GROUPS PER MOLECULE WITH A HYDROXYL TERMINATED POLYETHER CONTAINING AT LEAST TWO HYDROXYL GROUPS PER MOLECULE IN THE PRESENCE OF A GAS-GENERATING AGENT SELECTED FROM THE GROUP CONSISTING OF WATER AND HALOGENATED HYDROCARBONS HAVING BOILING POINTS NOT EXCEEDING 75*C. AT ATMOSPHERIC PRESSURE INERT WILL RESPECT TO THE POLYURETHANE FOAM-FORMING INGREDIENETS, THE IMPROVEMENT BEING WHEREIN THE COMBINED WEIGHT OF THE POLYETHER AND ANY WATER PRESENT BEING SUCH THAT THE PARTS BY WEIGHT OF POLYISOCYANATE COMPOSITION REQUIRED FOR THE COMBINED PARTS BY INTERACTION IS LESS THAN THE WEIGHT OF POLYETHER AND WATER USED, AND THE STEPS OF MIXING, UNDER NON-REACTION CONDITIONS, ALL THE POLYISOCYANATE COMPOSITION WITH AN AMOUNT OF THE POLYETHER SUCH THAT THE WEIGHT RATIO OF POLYISOCYANATE COMPOSITION TO POLYETHER IS 1 OR MORE WHEREBY FORMING AN UNREACTED DISPERSION OF POLYETHER IN THE POLYISOCYANATE COMPOSITION AND THEREAFTER MIXING THE DISPERSION WITH THE GAS-GENERATING AGENT AND THE REMAINING QUANTITY OF POLYETHER AND ALLOWING THE MIXTURE TO REACT THEREBY FORMING A FOAM.