| 摘要 |
<p>PURPOSE: To provide a hollow molded form which has excellent moisture resistance and water resistance of thermoplastic water soluble resin, and in which a shape sufficient for a practical use for a predetermined period (2-3 months) and then abrupt decomposing properties are exhibited. CONSTITUTION: The hollow molded form comprises at least two layers of an outermost layer made of biodegradable resin (A) and an innermost layer of thermoplastic water soluble resin (B), wherein the thickness ratio (A)/(B) of the outermost layer made of the resin (A) to the innermost layer of the resin (B) is 1/400-1/1.</p> |
