| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a biodegradable card substrate, constituted of skin layers B laminated on both sides of a core layer A. SOLUTION: The biodegradable card substrate, usable for a biodegradable identification card, is constituted of the core layer A and skin layers B, laminated on both sides of the core layer A. In this case, the core layer A is constituted of a composite having the essential ingredients of the copolymer of 3- hydroxybutyric acid and/or 3-hydroxyvaleric acid and 3-hydroxyvaleric acid as well as a polymeric aliphatic polyester, obtained by the dehydrating polycondensation of a glycol constituent and an aliphatic dicarboxylic acid. The skin layer B is constituted of a composite having the essential ingredients of a polylactic acid and a polymeric aliphatic polyester, obtained by the dehydrating polycondensation of the glycol constituent and the aliphatic dicarboxylic acid.</p> |
