| abstract |
The present invention provides a surface protective film which has proper adhesion property even for an adherend having a rough surface, which is excellent in sliding property of a back surface and is excellent also in anti-blocking property and unwinding characteristic (unwinding tension is reduced, no wrinkle or damage occurs even upon the attaching to the adherend, and the easy and high-speed attachment is made possibly). The surface protective film of the present invention comprising a three-layer composite form consists of an adhesive layer, a middle layer and a back surface layer, wherein the adhesive layer consists of a straight chain-form low density polyethylene 35 to 90 wt.%, a styrenic elastomer 5 to 50 wt.% and a tackfier ≤ 15wt.%, the middle layer consists mainly of a propylenic resin and the back surface layer is composed mainly of a propylenic resin constituting the middle layer and/or different propylenic resin, and the back surface layer has a surface roughness of ≥ 3 μ m by a ten-point mean roughness(Rz). |