DECOMPOSABLE COMPOSITE MATERIAL

摘要

PURPOSE:To enhance the decomposability and gas barrier properties of a composite material by laminating a film of a thermoplastic polymer based on polylactic acid or a copolymer of lactic acid and other hydroxycarboxylic acid to an aluminum foil. CONSTITUTION:A thermoplastic polymer is added to polylactic acid or a polylactic acid polymer obtained by the dehydro-polycondensation of lactic acid and other hydroxycarboxylic acid to prepare a thermoplastic polymer compsn. This compsn. is formed into a polylactic acid film. The polylactic acid film is superposed on an aluminum foil coated with an adhesive to be bonded thereto under pressure to obtain a stong composite film. The composite film is excellent in solubility and enhanced in gas barrier properties by the aluminum foil.