Packaging film including a lactide copolymer

摘要

The present invention relates to a packaging film including a lactide copolymer having no problem of pollution or toxicity while having good flexibility in addition to excellent properties such as mechanical properties, transparency, and processability, and preferably being applicable to food packaging. The packaging film includes a lactide copolymer including two or more specific block copolymerized repeating units that the hard segments of polylactide repeating units are connected to both ends of the soft segments of polyether polyol repeating unit, wherein the block copolymerized repeating units are connected to each other through the intermediation of urethane connecting groups derived from polyvalent isocyanate compound of which the average equivalent of isocyanate group per a molecule is more than 2 and less than 3.

主权项

1. A packaging film, including a lactide copolymer including two or more block copolymerized repeating units of Chemical Formula 1 in which hard segments of polylactide repeating units are connected to both ends of soft segments of polyether polyol repeating unit,
wherein the block copolymerized repeating units are connected to each other through the intermediation of urethane connecting groups derived from polyvalent isocyanate compound of which the average equivalent of isocyanate group per a molecule is 2.2 to 2.8, wherein the polyvalent isocyanate compound includes a diisocyanate compound and a polyvalent isocyanate compound of which the equivalent of isocyanate group is 3 or more, and wherein the lactide copolymer has a tensile strength of 348 to 458 kg/cm2, an elongation of 40 to 60%, and an E-modulus of 1.63 to 1.79 GPa: wherein in Chemical Formula 1, D is a C2-C10 linear or branched alkylene group, x is independently an integer of 30 to 500, and n is an integer of 30 to 1,000.