| 摘要 |
<p>A flexible base laminated with a metal on both the surfaces thereof having a structure of metal foil/polyimide/metal foil and also having superior adhesiveness, dimensional stability, heat resistance and electrical characteristics, and a process for producing the flexible base easily and continuously are provided, which flexible base is obtained by coating on a metal foil, a polyimide precursor solution which, after imidized, affords a resin having a specified coefficient of linear thermal expansion, followed by drying, further coating on the surface of the dried material of the solution, a polyimide precursor solution which, after imidized, affords a resin having a specified glass transition point, heating to imidize both the precursors and thereby obtain a base laminated with a metal on one surface, the two polyimide precursors being selected so that the polyimide laminate can have a specified coefficient of linear thermal expansion, and subjecting another metal foil to thermal contact bonding onto the resin surface obtained above.</p> |
