BIODEGRADABLE FILM AND ITS MANUFACTURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a biodegradable multilayered film suitable as a film for a refuse bag and a general bag, a film for an air bag cushioning material, a general packaging film and a shrink packaging film, hard to rupture even if refuse having various shapes and a protruded shape or the like is put in and not broken when a falling shock or the like is allowed to act and compression impact force is added in a case used as an air bag cushioning material. SOLUTION: This biodegradable film is a multilayered film constituted of a layer comprising a mixture composed of a polylactic acid resin (A) and a biodegradable polyester (B) with a glass transition temperature Tg of 10°C or below other than (A) and a sealing layer comprising a thermoplastic biodegradable resin. The sealing layer comprising the thermoplastic biodegradable resin forms at least one surface of the multilayered film. The tear strength of the film measured by JIS-K-7128 (B-method) is 6 mN/μm or above per unit thickness and the impact strength of the film measured by ASTM-D1709-91 (A-method) is 3 mJ/μm or above per unit thickness. COPYRIGHT: (C)2005,JPO&NCIPI