Process for making closed cell cellular bodies

Claim 1

A PROCESS OF PRODUCING CLOSED-CELL, GAS-CONTAINING CELLULAR BODIES, COMPRISING THE STEPS OF AGITATING A PASTRY LIQUID MASS OF A THERMOPLASTIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF POLYVINYL CHLORIDE, CO-POLYMERS OF VINYL CHLORIDE AND VINYL ACETATE, CO-POLYMERS OF VINYL CHLORIDE AND ACRYLONITRILE, CO-POLYMERS OF VINYL CHLORIDE, VINYL ACETATE AND ACRYLONITRILE, POLYSTYROL, CELLULOSE ACETATE, AND MIXTURES OF POLYVINYL CHLORIDE AND ACRYLONITRILEBUTADIENE POLYMERIZATES IN CONTACT WITH A GAS ABSORBABLE UNDER A PRESSURE SUFFICIENT TO FORCE SAID GAS INTO SAID PASTRY LIQUID MASS IN A FIRST CONTAINER SO AS TO GIVE SAID PASTY LIQUID MASS A SURFACE CONTACT AREAD MANY TIMES LARGER THAN THE SURFACE OF A SPHERE OF SAID MASS AND THUS UNIFORMLY INCORPORATE SAID GAS UNDER PRESSURE IN SAID PASTY LIQUID MASS, TRANSFERRING THE THUS FORMED GASCONTAINING PASTY LIQUID MASS TO A SECOND CONTAINER WHILE MAINTAINING SAID PRESSURE ON SAID MASS SO AS TO PREVENT FOAMING UP OF SAID MASS AND LOSS OF GAS THEREFROM, HEATING SAID GAS-CONTAINING PASTY LIQUID MASS IN SAID SECOND CONTAINER WHILE STILL UNDER PRESSURE UNTIL GELATINIZATION THEREOF, THEREBY FORMING A HOMOGENEOUS GELATINIZED GASCONTAINING MASS, AND COOLING AND EXPANDING SAID GELATINIZED GAS-CONTAINING MASS, THEREBY FORMING A CLOSED-CELL, GAS-CONTAINING CELLULAR BODY.