Flexible base materials, their preparation and their use for printed circuits

摘要: Flexible base materials, their preparation and use for printed circuits Abstract materials consisting of a metal foil film, firmly adhering thereto without an interlayer, polyamide/polyimide block copolymer the formula I, or prepared from poly-amide acid IVa Va dicarboxylic dichloride XI diamine XII. The individual symbols are defined in claim 1. according to invention suitable flexible circuits.