laminated as shown in fig1 the heat resistant film 10 may be a heat resistant film such as a polyimide polyphenylenesulfide or polyethyleneterephthalate film but most preferably a polyimide film if the heat resistant film is too thick 70 u03bcm or more or too thin 10 u03bcm or less it is not easy to carry out tape punching in taping therefore it is preferable that the thickness ranges 10 to 70 u03bcm more preferably 40 to 60 u03bcm the adhesive layer 20 has a ratio of 3 to 300 weight portions of polyfunctional epoxy resin and 3 to 300 weight portions of polyfunctional phenol resin for 100 weight of nbr containing the carboxyl functional group wherein hardener a rubber cross linking agent and other additives are added thereto the aforementioned nbr containing the carboxyl functional group has 2 000 to 200 000 of a weight average molecular weight preferably 3 000 to 200 000 10 to 60 weight of the acrylonitrile content preferably 20 to 50 weight and 1 to 20 weight of the carboxyl functional group content in this case if the weight average molecular weight is less than 2 000 it exhibits poor thermal stability if it is more than 200 000 it exhibits poor solubility for a solvent poor workability and lowered adhesive strength because viscosity increases in producing liquid if the content of acrylonitrile is less than 10 weight solubility of solvent is lowered the content of acrylonitrile more than 60 weight causes poor electric insulation if the content of the.