Patent ID: 7985474

Claim:
A wafer-dicing adhesive tape, comprising an outermost removable adhesive layer and an innermost removable adhesive layer on one side of a base film, wherein each of said outermost removable adhesive layer and said innermost removable adhesive layer has a resin composition containing a radiation-polymerizable compound, and are in the unhardened state having not been irradiated with radiation, and wherein said innermost removable adhesive layer is in contact with said base film and said outermost removable adhesive layer is in contact with said innermost removable adhesive layer, and wherein a content of the radiation-polymerizable compound in the resin composition constituting an outermost removable adhesive layer is larger than the content of the radiation-polymerizable compound in the resin composition constituting the innermost removable adhesive layer, such that the innermost removable adhesive layer exhibits flexibility after irradiation and the outermost removable adhesive layer exhibits a reduction in temporary adhesion strength after irradiation and wherein the resin composition constituting the outermost removable adhesive layer contains 50 to 200 parts by mass of the radiation-polymerizable compound for 100 parts by mass of an acrylic base resin, and wherein the resin composition constituting the innermost removable adhesive layer contains 5 to 100 parts by mass of the radiation-polymerizable compound for 100 parts by mass of an acrylic base resin; and wherein a stress applied to the base film is sufficiently introduced to the outermost removable adhesive layer irradiated with radiation, so that said outermost removable adhesive layer can be easily peeled off from chips cut.