Method of making flexible resinous replicas

Claim 1

THE PROCESS OF MAKING FLEXIBLE, RESINOUS REPLICAS OF A MODEL OBJECT, WHICH COMPRISES PRODUCING A HALLOW NEGATIVE OF THE OBJECT BY INTRODUCING THE OBJECT INTO A FLUID GELLABLE ALIGNATE INVESTMENT MATERIAL WHICH ONE GELLING PRODUCES CALCIUM ALIGNATE, HEATING THE INVESTMENT MATERIAL WITH THE OBJECT THEREIN UNTIL THE SAID MATERIAL GELS AROUND THE OBJECT, AND WITHDRAWING THE OBJECT FROM THE GELLED ALIGNATE INVESTMENT TO LEAVE AN IMPRESSION OF THE OBJECT THEREIN AS A HOLLOW DUPLICATING NEGATIVE OF THE OBJECT, INTRODUCING INTO THE SAID NEGATIVE A RESINOUS COMPOSITION COMPOSED OF A RESINOUS DISPERSION OF A VINYL CHLORIDE POLYMER IN A NON-POLYMERIZING PLASTICIZER FOR THE VINYL CHLORIDE POLYMER, AND A POLYMERIZED RESIN THAT IS SOLUBLE IN THE SAID PLASTICIZER COMPATIBLE WITH THE VINYL CHLORIDE POLYMER, AND HAVING A MOLECULAR WEIGHT OF NOT LESS THAN 40,000, THE SAID VINYL CHLORIDE POLYMER CONTAINING BETWEEN 93 PER CENT AND 99 PER CENT OF VINYL CHLORIDE, THE RESINOUS COMPOSITION HAVING A GELATION TEMPERATURE OF FROM APPROXIMATELY 65* C. TO APPROXIMATELY 85* C., AND HEATING THE RESINOUS COMPOSITION IN THE SAID NEGATIVE IMPRESSION TO GELATION TEMPERATURE UNTIL THE SAID COMPOSITION IS GELLED ON THE SURFACES OF THE IMPRESSION, AND REMOVING THE RESULTING GELLED POSITIVE REPLICA OF THE OBJECT FROM THE NEGATIVE IMPRESSION.