Patent ID: 8367177

Claim:
A pressure-sensitive adhesive sheet comprising: a release liner having a multilayer structure of at least three layers comprising two surface layers and an intermediate layer lying between them; and at least one pressure-sensitive adhesive layer, wherein one of the two surface layers of the release liner contains 50 percent by weight or more of a high-density polyethylene of total resin components constituting the surface layer, the other surface layer of the release liner contains 50 percent by weight or more of a low-density polyethylene of total resin components constituting the other surface layer, and the intermediate layer of the release liner contains, as its resin component, 95 percent by weight or more of a low-density polyethylene of total resin components constituting the intermediate layer; the surface layer containing 50 percent by weight or more of a high-density polyethylene of total resin components constituting the surface layer is used as a release layer; the pressure-sensitive adhesive layer is arranged on the surface layer containing 50 percent by weight or more of a high-density polyethylene of total resin components constituting the surface layer; the pressure-sensitive adhesive layer contains a polyacrylate pressure-sensitive adhesive; the pressure-sensitive adhesive sheet has a release force X (unit: N/mm) between the release liner and the pressure-sensitive adhesive layer; the release liner has a rigidity Y [(Young's modulus of the release liner)×(thickness of the release liner) 3 ] (unit: N·mm); the release force X and the rigidity Y satisfy the following conditions: 0 <X≦ 0.285 0 <Y< 180 X 4 +0.1; the content of other resin components than the low-density polyethylenes and the high-density polyethylenes is less than 20 percent by weight based on the total resin components of the release liner; the pressure-sensitive adhesive layer contains bubbles and/or hollow microspheres; and the specific gravity of the hollow microspheres is selected within ranges from 0.1 to 0.8 g/cm 3 .