Adhesive sheet for rear surface grinding, semiconductor wafer manufacturing method, and base material sheet

Abstract

The present invention aims to provide an adhesive sheet for back grinding capable of suppressing peeling of an adhesive layer and capable of peeling a wafer easily from an adhesive sheet. According to the present invention, provided is an adhesive sheet for back grinding of a semiconductor wafer having a convex part, comprising: a base material layer; and an adhesive layer provided on the base material layer, wherein: the adhesive layer comprises an opening part having a diameter smaller than a diameter of the semiconductor wafer; the adhesive layer is adhered to an outer peripheral part of the semiconductor wafer so shat the convex part of the semiconductor wafer is placed in the opening part; the adhesive layer is configured so that the convex part is protected by the base material layer with the semiconductor wafer adhered to the adhesive layer; the base material layer comprises a cushion layer and a surface treatment layer provided thereon; the adhesive layer is provided on the surface treatment layer; the surface treatment layer is formed of an acrylic resin composition containing an acrylic resin; the acrylic resin is cross-linked by light irradiation or heating; and the adhesive layer is formed of an acrylic resin composition containing an acrylic resin.