Patent ID: 7067030

Claim:
A method of separating and recovering cut workpieces of a semiconductor wafer or multilayer capacitor, comprising applying a heat-peelable adhesive sheet to the semiconductor wafer or multilayer capacitor to be cut into workpieces thereof, cutting the semiconductor wafer or multilayer capacitor into workpieces, heating and stretching theat-peelable adhesive sheet to separate the workpieces, and recovering the cut workpieces, wherein the heat-peelable adhesive sheet consists essentially of a substrate and, formed on at least one side thereof, a heat-expandable layer containing heat-expandable microspheres and an adhesive layer comprising an adhesive substance, the heat-expandable layer being located between the substrate of the heat-peelable adhesive sheet and the adhesive layer and said substrate having heat resistance, stretchability and a tensile elongation at break of about 250% or higher.