| abstract |
[PROBLEMS] When using a heat-peelable pressure-sensitive adhesive sheet, a heat-peelable pressure-sensitive adhesive sheet planned according to a difference in a workpiece or a process may be mistakenly used. For this reason, in order not to make such a mistake, it was necessary to clearly check the heat-peelable pressure-sensitive adhesive sheet that can be used according to the difference in the work piece and the process. In addition, in the case of a colorless and transparent heat-peelable pressure-sensitive adhesive sheet, it has been difficult to confirm whether or not the heat-peelable pressure-sensitive adhesive sheet has been accurately attached to the workpiece. Also, simply coloring the pressure-sensitive adhesive layer of the heat-peelable pressure-sensitive adhesive sheet may cause metal ions derived from the colorant to adhere to the surface of a workpiece such as an electronic component, thereby contaminating and damaging the electronic component. It was. A heat-expandable microsphere or a heat-expandable adhesive layer containing a colorant is provided on one or both sides of a substrate, or a heat-expandable microsphere via a colored intermediate layer on one or both sides of a substrate. A heat-peelable pressure-sensitive adhesive sheet, characterized in that a heat-expandable pressure-sensitive adhesive layer containing is provided and the total light transmittance is 50% or more. [Selection] Figure 1 |