PRODUCTION OF POLYIMIDE TUBE

摘要

PROBLEM TO BE SOLVED: To easily separate a core member from a tubular article in a method for producing a polyimide tube by bonding a polyimide precursor soln. to the surface of the core member in substantially uniform thickness and subsequently performing imide conversion reaction to form the tubular article and separating the tubular article from the core member. SOLUTION: A cylindrical core member 1 made of porous ceramics is used. After the completion of imide conversion, a tubular article 4 is separated from the core member 1. In this case, a liquid 5 not reacting with the tubular article 4 and the core member is injected into the opening end of the core member to be exuded from the pores of the outer peripheral surface of the core member and the bonding force of the outer peripheral surface of the core member and the tubular article 4 is weakened by the exuded liquid 5 to separate the tubular article. The core member may be used on the way of the imide conversion.