Polylactic acid resin, preparation method thereof, and packing film comprising the same
AssigneeSK Chemicals Co., Ltd.
InventorsYoung-Man Yoo, Tae-Woong Lee, Kye-Yune Lee, Jae-II Chung
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Abstract
The present invention relates to a polylactic acid resin and a packaging film comprising the same, wherein the polylactic acid resin is useful as a packaging material due to excellent properties including heat resistance as well as optimized flexibility. The polylactic acid resin comprises: a hard segment including a predetermined polylactic acid repeating unit; and a soft segment including a polyurethane polyol repeating unit in which certain polyether-based polyol repeating units are linearly connected in a medium of a urethane bond. In addition, the polylactic acid resin has a glass transition temperature (Tg) of 25-55° C.
Claims23
A polylactic acid resin, comprising:
- a hard segment comprising a polylactic acid repeating unit of the following Chemical Formula 1;
- and
- a soft segment comprising a polyurethane polyol repeating unit in which polyether polyol repeating units of the following Chemical Formula 2 are linearly linked via a urethane bond,
- wherein the polylactic acid resin has a glass transition temperature (Tg) of 22 to 55° C.:
- wherein A is a linear or branched alkylene of 2 to 5 carbon atoms, m is an integer of 10 to 100, and n is an integer of 700 to 5000.
Dependencies are inferred from the claim text.