Polylactic acid resin, polylactic acid resin composition, polylactic acid resin film, and molded article

The invention relates to a polylactic acid resin, a polylactic acid resin composition, a polylactic acid resin film, and a molded article. Wherein the soft segment containing 0.5 wt% or more of at least one repeating unit selected from the group consisting of a polyester-based polyol repeating unit, a polylactone-based polyol repeating unit, and a polycarbonate-based polyol repeating unit may cause improvements in flexibility, transparency, tear strength, processability, etc. And meanwhile, excellent biodegradability is also provided. 本发明涉及聚乳酸树脂、聚乳酸树脂组合物、聚乳酸树脂膜和模制品，其中包含含有0.5重量％或更多的选自基于聚酯的多元醇重复单元、基于聚内酯的多元醇重复单元和基于聚碳酸酯的多元醇重复单元中的至少一种重复单元的软链段可以引起柔性、透明度、撕裂强度、可加工性等的改善，同时还提供优异的可生物降解性。