| abstract |
Provided is a sheet-like packaging material that can eliminate the need for a small bag or small container for storing a metal rust inhibitor and has both a moisture absorption function under high humidity and a humidity control function by dehumidification under low humidity. SOLUTION: A sheet-shaped packaging material is a water-insoluble thermoplastic resin, polyethylene oxide or a modified resin thereof, and 0.01 to 40 weight of a water-soluble thermoplastic resin having a viscosity average molecular weight of 10,000 to 1,500,000. %, And a hygroscopic resin containing 0.01 to 20% by weight of a deliquescent salt having a critical humidity of less than 80% RH, and formed into a hygroscopic sheet. [Selection figure] None |