| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a packaging material which is excellent in moldability, decomposability and transparency since a decomposable lactic-acid based copolymer polyester which is sufficiently polymeric and tough and has rigidity, flexibility and transparency according to use is employed. SOLUTION: The packaging material contains, as an essential constituent, a linear lactic-acid-based copolymer polyester with a weight-average molecular weight of 20,000 to 400,000 which comprises (a) 25 to 98 wt.% of a poly-lactic acid block and (b) 2 to 75 wt.% of a polyester block comprising a chain hydrocarbon and/or an alicyclic hydrocarbon containing -COO- radicals.</p> |
