Patent ID: 7514143

Claim:
A re-peelable pressure-sensitive adhesive sheet, comprising an adhesive layer formed over a base film and at least one intermediate layer between the base film and the adhesive layer, wherein the intermediate layer comprises materials which have a function of relieving thermal contraction stress generated under 100-200° C. heat treatment, wherein said material is a viscoelastic sheet or a thermoplastic resin, wherein said intermediate layer comprises polyisobutylene; wherein, the intermediate layer has a storage elastic modulus (G′) of 3.0×10 4 to 1.0×10 8 Pa at 23° C. at the intermediate layer and a storage elastic modulus (G′) of 1.0×10 3 to 8.0×10 4 Pa at 200° C. at the intermediate layer, and wherein the base film has a heat shrinkage ratio, in both MD and TD directions, of less than 2% at 200° C. heat treatment for 2 hours.