| 摘要 |
<p>PURPOSE:To reduce the environmental disruption due to a used packing container by obtaining a packing container from a laminate easy to biodegrade. CONSTITUTION:A laminate consists of a plurality of layers between which straight chain polyester being a 3-hydroxybutric acid/3-hydroxyvaleric acid copolymer is interposed. When polyester is laminated, it is thermally decomposed by the heat generated at the time of extrusion molding and, therefore, in order to prevent this thermal decomposition, polyester 2 and polyolefin 3 are subjected to co-extrusion to be superposed on a sheet like base material so that polyester 2 is superposed on the base material 1.</p> |
