Pressure-sensitive adhesive sheet

A pressure-sensitive adhesive sheet including a pressure-sensitive adhesive layer, wherein

• the pressure-sensitive adhesive layer is formed from a pressure-sensitive adhesive composition including a base polymer, crosslinking agents of two or more species having mutually different types of crosslinkable functional groups, an azole-based rust inhibitor, and a tackifier resin;
• wherein the pressure-sensitive adhesive layer has a relative dielectric constant of 3 or more at 300 kHz;
• and
• monomeric components constituting the base polymer comprise a (meth)acrylate having an alkyl group having 1 to 4 carbon atoms at an ester end at 70% by weight or more of the monomeric components;
• the monomeric components constituting the base polymer comprise a carboxy group-containing monomer at 3.5% by weight or more and 10% by weight or less of the monomeric component;
• an amount of the azole-based rust inhibitor in the pressure-sensitive adhesive layer is less than 8 parts by weight with respect to 100 parts by weight of the base polymer, and 0.4 parts by weight or more and 12 parts by weight or less with respect to 10 parts by weight of the carboxy group-containing monomer included among the monomeric components constituting the base polymer;
• an amount of the tackifier resin in the pressure-sensitive adhesive layer is 10 parts by weight or more and 50 parts by weight or less with respect to 100 parts by weight of the base polymer;
• the crosslinking agents of two or more species comprise an isocyanate-based crosslinking agent and an epoxy-based crosslinking agent;
• an amount of the isocyanate-based crosslinking agent in the pressure-sensitive adhesive composition is 0.5 part by weight or more and 10 parts by weight or less with respect to 100 parts by weight of the base polymer;
• and
• an amount of the epoxy-based crosslinking agent in the pressure-sensitive adhesive composition is 1/1000 or more and 1/100 or less of the amount of the isocyanate-based crosslinking agent.