| 摘要 |
PROBLEM TO BE SOLVED: To provide an adhesive tape which not only has satisfactory adhesiveness at a relatively low temperature, but also has secure insulation and is free from generation of a gas and from occurrence of interfacial separation, and thus has excellent electrical reliability, by laminating adhesive layers A and B comprising specific polyimide mixtures respectively, which are different from each other in composition and in glass transition temperature. SOLUTION: This tape is obtained by laminating a metal plate, an adhesive layer A and an adhesive layer B sequentially. As adhesive layer A, an adhesive having a glass transition temperature which is 40 deg.C or more higher than that of adhesive layer B is used. Adhesive layer A comprises 100 to 20 mole % of a structural unit represented by formula I (wherein, Ar is a divalent group having an aromatic group and represented by formula III or the like), and 0 to 80 mole % of a structural unit represented by formula II (wherein Ar is as defined for formula I). Adhesive layer B comprises 100 to 40 mole % of a structural unit represented by formula I, and 0 to 60 mole % of a structural unit represented by formula IV (wherein R is a 1-10C alkylene or -CH2 OC6 H4 - group which is bonded to Si at the methylene group; and (n) is 1 to 20). The thickness of the metal plate (for example, copper) is 10 to 300 μm. |
