| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a packing material having excellent sealing performance, hygroscopicity, and the like. <P>SOLUTION: The hygroscopic packing material is made by preparing a sealing layer at least in one side of a hygroscopic foam element which consists of a blend including 5 to 100 pts. mass of a particulate hygroscopic material based on 100 pts. mass of a thermoplastic resin. A foamed resin layer of this hygroscopic foam element wherein expansion ratio is 2.0 to 20.0 times and this particulate hygroscopic material is conserved in this foamed resin layer has the structure wherein a void is formed in a part at least of the perimeter of this particulate hygroscopic material. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
