| 摘要 |
PROBLEM TO BE SOLVED: To provide foamed particles of polylactic acid which are usable as a heat-resistant cushioning material, and a molded product made of the foamed particles. SOLUTION: The molded product can be made by molding foamed particles of polylactic acid having a melt enthalpy (ΔH) of 5.0 J/g or more measured by differential scanning calorimetry (DSC) and by subjecting the molded particles to a heat treatment at 80-120°C, wherein the foamed particles of polylactic acid are produced by a method characterized by (1) adding a thickener to a polylactic acid and a polylactic acid mixture comprising L-form and D-form in a ratio of D/L=5/95-40/60 (mol%) or L/D=5/95-40/60 (mol%) to produce a polylactic acid composition, (2) impregnating the above composition with a 3-6C hydrocarbon compound as a foaming agent to produce foamable particles, and (3) subjecting the above foamable particles to a heat treatment for 10-300 sec by steam at a temperature of 50-105°C. COPYRIGHT: (C)2004,JPO |
