| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a surface protective film in which migration of a peeling agent to a self-adhesive layer is suppressed and a certain degree of peeling resistance is imparted between the self-adhesive layer and a peeling layer, and which enables stable peeling when the peeling layer is peeled from a base material layer/self-adhesive layer. <P>SOLUTION: In the surface protective film, a base material layer, a self-adhesive layer and a peeling layer are laminated in this order. The peeling layer is formed of a polypropylene film, and the surface protective film satisfies following requirements (1) to (3): (1) surface roughness (Ra) of the surface of the peeling layer in contact with the self-adhesive layer is 0.10-0.30 μm, (2) flexural stiffness of the peeling layer, measured with a loop stiffness tester, is 0.2×10<SP>-3</SP>to 10.0×10<SP>-3</SP>N/20 mm, and (3) peeling resistance between the self-adhesive layer and the peeling layer is 0.16 to 0.30 N/25 mm. <P>COPYRIGHT: (C)2010,JPO&INPIT |
