| 摘要 |
A surface protective pressure-sensitive adhesive sheet being less staining, less likely to trap air bubbles, and attachable by hand and having good wetting ability on an adherend and having an appropriate level of adherability and light peelability is provided, which includes a pressure-sensitive adhesive layer obtained by crosslinking a polymer-containing pressure-sensitive adhesive composition, wherein the pressure-sensitive adhesive layer has a surface that has a hardness of 0.1 MPa or more and a load curve with a minimum load of -0.3 µN or less as measured by nanoindentation, and which has a residual adhesive strength of 50 % or more, wherein the residual adhesive strength is calculated from the formula: residual adhesive strength (%) = 100 x [(adhesive strength B)/(adhesive strength A)], wherein adhesive strength A is the adhesive strength measured by a process including bonding a standard pressure-sensitive adhesive tape to the surface of an adherend and then peeling off the pressure-sensitive adhesive tape from the adherend surface, and adhesive strength B is the adhesive strength measured by a process including bonding the surface of the pressure-sensitive adhesive layer of the protective pressure-sensitive adhesive sheet to the surface of an adherend, then peeling off the protective pressure-sensitive adhesive sheet from the adherend surface, further bonding a standard pressure-sensitive adhesive tape to the adherend surface from which the protective pressure-sensitive adhesive sheet has been peeled off, and then peeling off the pressure-sensitive adhesive tape from the adherend surface. |
