Patent ID: 7767556

Claim:
A method of manufacturing an adhesive sheet, comprising a step of disposing an adhesive layer on one side of a base material, a step of fabricating a laminated sheet by stacking a separator on the adhesive layer, a step of fabricating a rolled laminated sheet by taking up the laminated sheet in roll, and a step of heating the rolled laminated sheet at a temperature of 30 to 60° C. for 12 to 100 hours, wherein the resulting adhesive sheet has at least an adhesive layer on one side of a base material, wherein the base material has a surface having an arithmetic average height Ra of 0.4-0.9 μm, wherein said adhesive sheet is prepared by cutting said adhesive sheet from said rolled laminated sheet, wherein the surface of the base material that does not contact the adhesive layer is free from convex parts that have a height (h) of 1 μm or more over a width (W) of 20 mm or less, and concave parts that have a depth (d) of 1 μm or more over a width (W) of 20 mm or less, and wherein said separator comprises a surface not contacting with the adhesive layer that has an arithmetic average height Ra of 0.2 to 2 μm.