Polylactide resin, method of preparing the same, and polylactide resin composition comprising the same

摘要

Disclosed are polylactide resin that may exhibit and maintain excellent mechanical properties, exhibit excellent heat resistance, and thus can be used for a semi-permanent use, a method for preparing the same, and a polylactide resin composition comprising the same.;The polylactide resin has a low hydrolysis rate constant of 0.1 day−1 or less and a weight average molecular weight of 100,000˜1,000,000, under specific conditions.

主权项

1. 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:
Loge [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).