| 摘要 |
<p>PURPOSE: To provide a multilayered structure, especially, a multilayered film for packaging an alkaline or caustic compsn. CONSTITUTION: A multilayered structure substantially consists of (1) a first layer of an acid functional polymer soluble in an aq. alkaline medium, (2) a second layer of partially hydrolyzed thermoplastic PVOH and, according to circumstances, (3) a third layer of sufficiently hydrolyzed thermoplastic PVOH.</p> |
