| 摘要 |
PURPOSE: A protective film is provided to prevent a metal or metal oxide layer used as an electromagnetic wave-shielding material from being contaminated, thereby helping to maintain the electromagnetic shielding performance. CONSTITUTION: The protective film comprises a substrate material and a pressure sensitive adhesive layer formed on the substrate, wherein the pressure sensitive adhesive layer has a contact angle with methylene iodide of 70°or less, which is measured right after the contact of the pressure sensitive adhesive layer with the surface to be adhered, and has the rate of difference in the contact angle to the methylene iodide of 8% or less. |
