| 摘要 |
PURPOSE:To firmly bond an adhesive layer to a base material by forming a sealing member with a synthetic resin base material and an adhesive layer, and interposing an intermediate layer which is the same material as the base material and has lower molecular weight than the base material between the base material and the adhesive layer. CONSTITUTION:A sealing member 9 which seals air holes formed in the bottom of a positive case 7 consist of a synthetic resin base material 10 and an adhesive layer 11. An intermediate layer 12 which is the same material as the base material 10 and has lower molecular weight than the base material 10 is interposed between the base material 10 and the adhesive layer 11. Since the layer 12 has large irregularity and short molecular length, affinity with the layer 11 is increased, and the layer 11 is, therefore, firmly bonded to the base material 10. When the sealing member 9 is removed from the bottom of the case 7, the adhesive 10 is rarely left on the bottom of the case 7. |
