Pressure-sensitive adhesive sheet

Abstract

A pressure-sensitive adhesive sheet 1 comprising a base material 11 and a pressure-sensitive adhesive layer 12 has formed therein a plurality of through holes 2 that pass through from one surface to the other surface thereof. The through holes 2 have a diameter in a range of 0.1 to 300 μm, and a hole density in a range of 30 to 50,000 per 100 cm2. Moreover, the pressure-sensitive adhesive layer 12 has a storage modulus at 70 ° C. of not less than 9×103 Pa, and a loss tangent at 70° C. of not more than 0.55. According to the pressure-sensitive adhesive sheet 1, air escaping ability is not impaired even upon being subjected to very high pressure, or pressure and heat, during storage, transportation or the like, and hence air entrapment and blistering can be prevented or eliminated stably.

Dependencies are inferred from the claim text.