PROCESS FOR PRODUCING MULTILAYERED POLYIMIDE FILM

摘要

A process for producing a multilayered polyimide film which is even in film thickness in the film-width direction and in dimensional change and has a thermoplastic polyimide layer or the like serving as an adhesive layer. The process for multilayered polyimide film production comprises feeding at least two polyimide resin solutions or polyimide precursor resin solutions to a multilayer coextrusion die having two or more channels and spreading and casting them, and is characterized in that in at least one of the channels, a solvent is added to the resin solution and the amount of the solvent to be added is regulated separately from the amount of the resin solution to be fed to thereby control the thicknesses of the respective layers constituting the multilayered film. ® KIPO & WIPO 2009