Flexible metal foil-polyimide laminate and making method

摘要

A flexible metal foil-polyimide laminate is prepared by applying a dimethylacetamide solution of polyamic acid onto a metal foil, drying the applied solution to form a semi-dry adhesive layer, laminating a polyimide film thereto on a hot roll press, and heat curing for solvent removal and imidization. The polyimide film has a dimethylacetamide gas permeability of at least 0.1 kg/m².hr at 5 Torr and 200° C. In the heat curing step, the residual solvent and the water formed upon imidization in the adhesive layer are removed through the polyimide film.