| 摘要 |
PROBLEM TO BE SOLVED: To provide a polylactic acid resin foam having excellent fungistatic properties, freshness retaining properties of foods, biodegradability and even excellent environment hygiene and to provide a method for producing the foam. SOLUTION: The polylactic acid resin foam is characterized in that the content of lactic acid is 40-400 ppm based on the total weight. Thereby, the foam has the excellent fungistatic properties and excellent freshness retaining properties of fruits, vegetables, etc. The polylactic acid resin foam can readily be produced by regulating the residence time of the polylactic acid resin in an extruder so as to provide 250-2,100 s and regulating the barrel temperature T of whichever higher of the barrel temperature in a compression section or a metering section so as to satisfy prescribed conditions or feeding an inorganic compound generating water by heating to the extruder. COPYRIGHT: (C)2007,JPO&INPIT |
