BIODEGRADABLE RESIN CAPABLE OF BEING SAFELY USED TO PRODUCTS LIKE FOOD OR MEDICINE PACKING MATERIAL WHICH ARE SENSITIVE TO HARMFUL MATERIAL FOR HUMAN BODY, AND A MANUFACTURING METHOD THEREOF

摘要

PURPOSE: A manufacturing method of a biodegradable resin is provided to provide excellent physical properties without minimizing the use of chain extender which is harmful for human body or environment.;CONSTITUTION: A manufacturing method of a biodegradable resin comprises: a step of manufacturing polyester prepolymer by polycondensation of divalent alcohol monomer and divalent carboxylic acid monomer; a step of controlling the moisture content of polyester prepolymer to 200 ppm or less; and a step of connecting prepolymer by reacting the polyester prepolymer with 0.1 weight% of less of polyvalent isocyanate compound.;COPYRIGHT KIPO 2012