Method for making synthetic resin foams

Claim 1

IN A METHOD OF MAKING A FOAMED POLYURETHANE RESIN BY REACTION BETWEEN AN ORGANIC POLYISOCYANATE AND AN ORGANIC COMPOUND CAPABLE OF FORMING A POLYURETHANE BY REACTION WITH SAID POLYISOCYANATE, A CATALYST FOR THE REACTION BETWEEN SAID POLYISOCYANATE AND SAID COMPOUND AND A SMALL AMOUNT OF WATER WHEREIN SAID COMPONENTS ARE INTRODUCED IN LIQUID CONDITION AT PREDETERMINED RATES OF FLOW RESPECTIVELY INTO A CLOSED MIXING CONTAINER IN WHICH SAID COMPONENTS ARE CONTINUOUSLY MIXED AND FROM WHICH THEY ARE CONTINUOUSLY DISCHARGED IN MIXED CONDITION THROUGH A COMMON OUTLET WHILE STILL LIQUID, CONVERSION OF SAID COMPONENTS MIXED AS AFORESAID IN SAID MIXING CONTAINER TO SAID FOAMED POLYURETHANE RESIN OCCURING AFTER THEIR DISCHARGE THROUGH SAID OUTLET, THE IMPROVEMENT WHICH COMPRISES CONTINUOUSLY INTRODUCING EACH OF SAID COMPONENTS INTO SAID CONTAINER IN A STEADY METERED, AND NON-FLUCTUATING STREAM AT A DELIVERY PRESSURE INTO SAID CONTAINER NOT GREATER THAN ABOUT 300 P.S.I. FOR CONTINUOUS TRAVEL THROUGH SAID CONTAINER FROM THE DELIVERY POINT OF EACH SAID STREAM TO SAID OUTLET SUCH THAT THE LAST LIQUID COMPONENT INTRODUCED INTO SAID CONTAINER DURING THE TRAVEL OF SAID COMPONENTS TOWARD SAID OUTLET HAS A RESIDENCE TIME IN SAID CONTAINER NOT LONGER THAN 10 SECONDS, SAID LIQUID COMPONENTS IMMEDIATELY UPON CONTACT WITH EACH OTHER IN SAID MIXING CONTAINER AND THEREAFTER DURING THEIR TRAVEL TO SAID OUTLET BEING MAINTAINED AT A PRESSURE WITHIN SAID CONTAINER NOT GREATER THAN ABOUT 15 P.S.I. AND BEING SUBJECTED TO MECHANICALLY PRODUCED SHEAR BY RAPIDLY ROTATING A MXING SHAFT HAVING IMPELLERS MOUNTED THEREON WITHIN SAID CONTAINER WHICH ROTATE THEREWITH AND EXTEND TOWARD THE INNER PORTIONS OF SAID CONTAINER IN THE PATH OF SAID COMPONENTS IN THEIR TRAVEL TO SAID OUTLET, THERE BE-