Patent ID: 8779083

Claim:
Polylactide resin having a weight average molecular weight of 100,000˜1,000,000, having a hydrolysis rate constant (k) of 0.1 day −1 or less, as calculated by the following Mathematical Formula 1, at a temperature of 60° C. and relative humidity of 90%, and containing residual metal of tin or zinc derived from a catalyst in the content of 20 ppm or less, based on the weight of the polylactide resin: Log e [Mn,t/Mn, 0 ]=−kt [Mathematical Formula 1] in the Mathematical Formula 1, Mn,0 represents an initial number average molecular weight of the polylactide resin, and Mn,t represents a number average molecular weight of the polylactide resin when maintained at a temperature of 60° C. and relative humidity of 90%, for a time t (day).