| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface protective film which has excellent expandability and prevents paste residues after being peeled off to an adherend.SOLUTION: The surface protective film comprises an adhesive layer including a propylene-based polymer, a polymer block A in which the aromatic alkenyl compound units are continuous represents a polymer composed mainly of aromatic alkenyl compound units, a polymer block B which is an aromatic alkenyl-conjugated diene copolymer block in which a conjugated diene unit and the aromatic alkenyl compound units are included at random and which has an aromatic alkenyl compound unit content being 10-35 wt.%, and an aromatic alkenyl block polymer, wherein the total aromatic alkenyl compound unit content is 30-50 wt.%, and the weight ratio (A:B) of the total amount of polymer block A to the total amount of polymer block B is within the range of 5:95-25:75, and wherein the content of the propylene-based polymer in the total amount of the aromatic alkenyl block polymer and the propylene-based polymer is 25-60 wt.%. |
