| abstract |
The present invention provides a thermosetting adhesive tape or sheet having a thermosetting adhesive layer, which can be stored stably at room temperature, and, when thermally cured, can exert excellent adhesiveness and high thermal stability after exposure to heat and moist, because the resin in the adhesive rapidly reacts upon curing. The thermosetting adhesive tape or sheet according to the present invention includes a thermosetting adhesive layer which has a gel fraction of less than 70%, a difference in gel fraction between before and after storage at 40°C for 7 days [(gel fraction after storage at 40°C for 7 days)-(gel fraction before storage at 40°C for 7 days)] of 15% or less, and a gel fraction after curing at 150°C for 1 hour of 90% or more. |