| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polylactic acid-based biodegradable mulch film, in particular, excellent in flexibility, impact resistance and bleeding-proofness, as to a biodegradable mulch film high in a soil-water holding property and excellent in growing performance of a crop. <P>SOLUTION: This biodegradable mulch film comprises a composition having a glass transition temperature Tg within a range of 0°C or higher to 45°C or lower, and a thermal shrinkage rate Sm (winding longitudinal direction) when treated for 30 minutes at 65°C, and a thermal shrinkage rate St (width direction (direction perpendicular to the winding longitudinal direction)), satisfy respectively a condition of 3St≤Sm; 2≤Sm≤5 (%); and -1≤St≤2 (%), in the biodegradable mulch film. <P>COPYRIGHT: (C)2012,JPO&INPIT |
