Patent ID: 8247503

Claim:
An adhesive sheet comprising a base material and, formed thereon, an adhesive layer comprising: an epoxy thermosetting resin (A), a thermosetting agent (B) and a thermosetting accelerating agent (C), wherein the thermosetting accelerating agent (C) is soluble in methyl ethyl ketone and inactive as a thermosetting accelerating agent at room temperature, wherein the thermosetting accelerating agent (C) is boron trifluoride 2-methyl imidazole, wherein the adhesive layer has a thickness of about 0.5 to 5 μm, wherein the adhesive layer is obtained by diluting a composition comprising the epoxy thermosetting resin (A), the thermosetting agent (B), and the thermosetting accelerating agent (C) with methyl ethyl ketone as a solvent, coating the resulting solution on the base material, and vaporizing the solvent.