Patent ID: 8916272

Claim:
A surface protective film for an electronic device having polarizer comprising: a substrate film; a gas barrier layer on the substrate film; a stack of 3 layers; and an antistatic layer including 0.01˜0.05 wt % of ammonium salt dissolved in 99.95˜99.99 wt % of solvent, wherein the solvent is selected from the group consisting of methyl alcohol, isoprophyl alcohol, isobutyl alcohol and isopentyl alcohol, the stack comprising: a middle layer; and a first skin layer and a second skin layer on opposite sides of the middle layer and in direct contact with the middle layer, wherein at least one of the first skin layer and the second skin layer is formed of a resin having hardness lower than a hardness of a surface to be protected by the surface protective film, the middle layer comprises a resin including 77˜80 wt % of high density polyethylene, and the middle layer further comprises 23˜20 wt % of linear low density polyethylene, and wherein no additive is added to the first skin layer to be in contact with the surface to be protected, and wherein the antistatic layer is under the second skin layer and does not contact the surface to be protected for preventing aging of slipping property of the surface protective film; and wherein the ammonium salt is at least one selected from the group consisting of ammonium nitrate, ammonium carbonate and ammonium hydroxide.