| abstract |
A pressure-sensitive adhesive layer and a pressure-sensitive adhesive layer that have a lower dielectric constant and dielectric loss than conventional pressure-sensitive adhesive layers, and have both flexibility, rigidity, durability, and reworkability. To do. An acrylic polymer is at least one or more of a monomer group consisting of an alkyl (meth) acrylate monomer having an alkyl group with a C1 to C14 carbon number, an alicyclic group-containing monomer, and a branched structure alkyl group-containing monomer. And butyl (meth) acrylate with respect to a total of 100 parts by weight of the monomer excluding the hydroxyl group-containing copolymerizable vinyl monomer. 30 to 100 parts by weight and 0.1 to 3.5 parts by weight of a hydroxyl group-containing copolymerizable vinyl monomer, having a gel fraction of 40 to 75%, measured by laminating to a thickness of 1000 μm, The relative dielectric constant at a frequency of 100 kHz is 1.50 to 5.50, and the dielectric loss is 0.01 to 0.09. [Selection figure] None |