Polylactide (PLA) was used as a binder for recycled molding sands in foundry processes. PIA was produced by lactide polycondensation with a high efficiency (71%). The molding sands with 2% binder content were prepd. by evaporating the solvent from CHCl3 soln. of PLA. The PLA-contg. molding sands cured at 325 degrees C were successfully recycled up to 13 times.