Process of making vinyl resin plastic sponge

Claim 1

THE PROCESS OF MAKING A PLASTICIZED VINYL RESIN SPONGE WHICH COMPRISES MECHANICALLY FROTHING AN INTIMATE MIXTURE OF A PASTISOL COMPRISING 100 PARTS OF A PARTICULATE THERMOPLASTIC VINYL RESIN SELECTED FROM THE GROUP CONSISTING OF POLYVINYL CHLORIDE, VINYL CHLORIDERIDE COPOLYMER, VINYL CHLORIDE-DIETHYL MELATE COPOLYMER, AND VINYL CHLORIDE-DIETHYL FUMARATE, THE RELATIVE PROPORTIONS OF COMBINED MONOMERS IN THE SAID COPOLYMERS BEING EQUAL TO 85-95% OF VINYL CHLORIDE AND 15-5% OF THE OTHER STATE MONOMER, AND FROM 50 TO 400 PARTS OF A HIGH BOILING ORGANIC LIQUID PLASTICIZER FOR SAID RESIN, FROM 1 TO 25 PARTS OF A NON-IONIC SURFACE-ACTIVE AGENT, FROM 3 TO 100 PARTS OF AN ALKALI METAL SALT OF A SULFONATED FATTY ACID, AND FROM 1 TO 25 PARTS OF AN ALKALI METAL SALT OF ETHYLENE DIAMINE TETRAACETIC ACID, AND THEREBY INCORPORATING A SURROUNDING GAS IN SAID MIXTURE, SUBSEQUENTLY HEATING THE RESULTING FROTH AT A TEMPERATURE AND FOR A TIME SUFFICIENT TO FUSE THE RESIN PARTICLES WITH SAID PLASTICIZER WHILE MAINTAINING THE FROTH STRUCTURE, AND COOLING THE RESULTING MATERIAL TO ROOM TEMPERTURE.