ENDLESS TUBULAR POLYIMIDE FILM

摘要

A process for producing a high-quality nonconductive or semiconductive endless (jointless) tubular polyimide film simply and efficiently with high economy, etc. In particular, there is provided a nonconductive or semiconductive endless tubular polyimide film constituted of a polyimide produced from a component of aromatic diamine and a component of two or more aromatic tetracarboxylic acids composed of 15 to 55 mol% of asymmetric aromatic tetracarboxylic acid ingredient and 85 to 45 mol% of symmetric aromatic tetracarboxylic acid ingredient, wherein a given amount of carbon black is dispersed according to necessity, and there are further provided a process for producing the same, etc.