| 摘要 |
In a flexible metal foil/polyimide laminate comprising in sequence, a heat resistant polyimide film, an adhesive layer, and a metal foil, the adhesive layer is a polyimide adhesive layer with a Tg of at least 400° C., obtained by heat imidization of a polyamic acid varnish containing 5-200 ppm of a leveling agent, typically polyether-modified silicone. This laminate of the all polyimide type takes full advantage of the properties of heat resistant polyimide film, includes the adhesive layer having a smooth surface, and is free of thickness variations.
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