Abstract: This invention relates to an image transfer material for thermal recording of the electric current-conducting type. Since the image transfer material of the present invention comprises an aromatic polyamide film with a thickness of 1-10 .mu.m, which contains 10-40% by weight of carbon black, and has a tensile strength in at least one direction of not less than 8 kg/mm.sup.2 and a dimensional change in at least one direction at 200.degree. C. under a load of 1 kg/mm.sup.2 of 5% or less, and an ink layer formed on the film the image transfer material of the present invention is a thin image transfer material which excells in heat resistance and anti-pinhole property, which makes it possible to conduct high speed printing and to promote the printing quality.

Abstract: The present invention relates to a process for producing an of aromatic polyimide film comprising (A) casting on a support a dope containing an amide-type polar solvent and 10-45 weight percent of a polyamic acid having more than 0.4 dl/g an inherent viscosity of more than 0.4 dl/g, (B) concentrating the polymer content to be at least higher than that of the initial dope while simultaneously raising the ring closure ratio above 30%, (C) removing the solvent from the film by extraction in an aqueous medium so as to lower the solvent content of the film below 10% and (D) then heating the film to a temperature of more than 200.degree. C.The process of the present invention is useful for the production of aromatic polyimide film having a reduced rate of solvent decomposition and improved productivity.