POLYLACTIC ACID EXPANDABLE RESIN PARTICLE

PROBLEM TO BE SOLVED: To provide a polylactic acid expandable particle not restricting the kind of a usable foaming agent, and the foaming agent being impregnated to the polylactic acid resin particle in a water suspension system or in a mixed system with water, and capable of obtaining the expanded particle having a proper cell size after the expansion molding without using a foaming core agent. SOLUTION: This polylactic acid expandable resin particle is obtained in the water suspension system or in the mixed system of 100 pts.wt. polylactic acid resin composition and 1-50 pts.wt. water, by impregnating not less than 3 wt.% foaming agent to the polylactic acid resin composition, then by drying, and the polylactic acid expandable resin particle with a residual water content of not greater than 0.5% has 5,000-30,000 minute pores of 1 μm-10 μm diameter per 1 mm of its cross section.