Method of making stable plastic molding composition of low shrinkage and product obtained thereby

Claim 1

THE METHOD OF MAKING AN IMPROVED MOLDING COMPOSITION THAT HAS LOW SHRINKAGE CHARACTERISTICS DURING MOLDING, WHICH METHOD COMPRISES MIXING A INHIBITED MONOMER AND A POLYMER IN PROPORTIONS BETWEEN 35 PARTS OF MONOMER TO 65 PARTS OF POLYMER, AND 65 PARTS OF MONOMER TO 35 PARTS OF POLYMER, TOGETHER WITH A POLYMERIZATION CATALYST, BOTH THE MONOMER AND POLYMER BEING FROM THE GROUP CONSISTING OF METHYL METHACRYLATE, THE ESTER OF ACRYLIC ACID; THE ESTER OF METHYL ACRYLIC ACID; CYCLOHEXYL METHYL METHACRYLATE; METHYL ETHYL METHACRYLATE; AND STYRENE, STIRRING THE MIXTURE UNTIL IT BECOMES THICK AND THE MONOMER AND POLYMER NO LONGER SEPARATE WHEN THE STIRRING IS STOPPED, KEEPING THE MIXTURE IN A CONTAINER UNTIL THE MIXTURE JELLS INTO A GUM, AND THEREAFTER SOFTENING THE COMPOSITION BY MILLING THE GUM UNTIL IT ACQUIRES SUBSTANTIALLY THE SOFT AND PLIABLE CHARACTERISTICS OF SOFT PUTTY.