Foamable vinyl resin composition containing polyhalogenated hydrocarbon and process for producing cellular structure therefrom

Claim 1

A PROCESS OF FORMING FOAMED VINYL RESIN OF SOLID CELLULAR STRUCTURE WHICH COMPRISES DISPERSING IN A FREEFLOWING PLASTISOL MAINTAINED AT A TEMPERATURE SUBSTANTIALLY BELOW ITS FUSION TEMPERATURE AND AT A PRESSURE BELOW 100 P.S.I. SAID PLASTISOL INCLUDING A FINELY DIVIDED VINYL RESIN CONTAINING A PREDOMINANT AMOUNT OF VINYL CHLORIDE POLYMERIZED THEREIN AND AN ORGANIC PLASTIZER FOR SAID RESIN, A POLYHALOGENATED HYDROCARBON HAVING AN ATMOSPHERIC BOILING POINT BETWEEN ABOUT -40* F, AND ABOUT +175* F, AND BEING CHEMICALLY INERT WITH THE RESIN AND THE PLASTIZER, AND BEING SUBSTANTIALLY COMPLETELY SOLUBLE IN THE SAID PLASTIZER WHEN IN THE LIQUID STATE FORMING A FREE-FLOWING, EXPANDED, LOW DENSITY FOAM FROM THE MIXTURE BY EXPOSURE TO A TEMPERATURE SUBSTANTIALLY ABOVE THE ATMOSPHERIC BOILING POINT OF THE SAID POLYHALOGENATED HYDROCARBON, HEATING THE LOW DENSITY FOAM TO AT LEAST THE FUSION TEMPERATURE OF THE PLASTISOL TO EFFECT SOLVATION OF THE RESIN IN THE PLASTIZER AND FUSE THE PLASTICIZED RESIN AND THEN COOLING THE FUSED FOAM TO FORM THE FOAMED VINYL RESIN OF SOLID CELLULAR STRUCTURE.