Patent ID: 7586060

Claim:
A manufacturing method of laser processed parts by using a protective sheet for laser processing having at least an adhesive layer on a base material, with the density of the base material of 1.1 g/cm 3 or more, comprising a step of adhering an adhesive layer of the protective sheet for laser processing to the incident side of laser beam of a workpiece, a step of processing the protective sheet for laser processing and workpiece by irradiating with laser beam, and a step of peeling off the protective sheet for laser processing from the workpiece after processing, wherein said base material comprises a base polymer and a filler, said filler being selected from the group consisting of a colorant, a pigment, a dye, gold, copper, platinum, silver, fine metal particles, metal colloids, carbon particles, and inorganic particles, wherein said filler is 2-20 parts by weight per 100 parts of the base polymer, and wherein the workpiece is any one of sheet material, circuit board, semiconductor wafer, metal substrate, semiconductor laser light emitting or photo detecting element board, MEMS board, and semiconductor package.