Process for producing flexible hollow plastic articles

Claim 1

THE PROCESS OF PRODUCING FLEXIBLE, HOLLOW, PLASTIC ARTICLES CHARACTERIZED BY HIGH TOUGHNESS AND HIGH RESISTANCE TO TEARING, WHICH COMPRISES PREPARING A HOLLOW, NON-POROUS, SEAMLESS MOLD FOR THE ARTICLES, INTRODUCING INTO THE MOLD A THERMOSETTING PLASTISOL COMPOSITION COMPRISING A VINYL CHLORIDE POLYMER RESIN CONTAINING AT LEAST 93 PER CENT OF VINYL CHLORIDE, A NON-POLYMERIZING POLYESTER PLASTICIZER FOR THE RESIN, AN ACRYLATE COMPOUND SELECTED FROM THE GROUP CONSISTING OF DIACRYLATES AND DIMETHACRYLATES OF MIXED POLYETHYLENEGLYCOLS HAVING AN AVERAGE MOLECULAR CONSTITUENT OF THE COMPOUND, AND AN OXYGENWEIGHT OF BETWEEN 100 TO 200 FOR THE GLYCOL LIBERATING CATALYST SELECTED FROM THE GROUP CONSISTING OF ORGANIC PERIOXIDES AND HYDROGEN PEROXIDE HEATING THE MOLD CONTAINING THE COMPOSITION TO GELATION TEMPERATURE OF THE COMPOSITION, MAINTAINING THE MOLD AT THE SAID TEMPERATURE UNTIL THE COMPOSITION HAS GELLED ON THE SURFACES OF THE MOLD, DRAINING UNGELLED COMPOSITION FROM THE MOLD, COMPLETING POLYMERIZATION OF THE ACRYLATE COMPOUND, AND DEVELOPING MAXIMUM STRENGTH AND TEAR-RESISTANCE IN THE RESULTING MOLDED ARTICLE BY HEATING THE MOLDED ARTICLE WHILE IN THE MOLD TO A TEMPERATURE BETWEEN APPROXIMATELY 320* F. AND 420* F. UNTIL MAXIMUM TOUGHNESS AND TEAR-RESISTANCE HAVE BEEN DEVELOPED.