EXPANDABLE RESIN COMPOSITION HAVING BIODEGADABILITY

摘要

PROBLEM TO BE SOLVED: To obtain an expandable resin composition excellent in productivity while having biodegradability. SOLUTION: This resin composition is obtained by compounding a polylactic acid having a molar ratio of L-form to D-form of 95/5-60/40 or 40/60-5/95 with 0.5-5 wt.%, based on the polyactic acid, polyisocyante compound having an isocyanate group of >=2 equivalents/mol and aging the resulting resin composition at a temperature of 20-60 deg.C while maintaining its potential water content in the range of 100-10,000 ppm, and has a melt viscosity after the aging in terms of melt index value of not greater than 5.