PROTECTIVE FILM AND PROCESS FOR MANUFACTURING THE SAME

摘要

PURPOSE: To provide a protective film having a high quality for dry film resists. CONSTITUTION: The protective film uses a polyethylene film obtained by either a process of pressurizing ethylene with an ultra-high pressure compressor, then polymerizing the ethylene at a reaction temperature of 190°C-300°C and under a reaction pressure of 167 MPa or higher in the presence of a radical- polymerization initiator, or a process of pressurizing ethylene with an ultra-high pressure compressor, then polymerizing the ethylene at a reaction temperature of 190°C-300°C in the presence of a radical polymerization initiator and also in the coexistence of the radical-polymerization inhibitor in the reaction system.