| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a tubular object of high durability and low production cost and its manufacturing process, by lowering a coefficient of dynamic friction especially on the exterior surface of the tubular object. <P>SOLUTION: A tubular object (31) comprises a molded and heat cured composite containing polyimide and fluororesin particles, wherein at least a part of the fluororesin particles residing near the surface of the tubular object (31) precipitates by melt flowing to the exterior surface or inner and outer surfaces of the tubular object and forms a fluororesin coating film partially or fully. The tubular object (31) can be manufactured by aplying a liquid mixture, in which the fluororesin particle is added into a polyimide precursor solution, on the outer surface of a die and cast molding into a predetermined thickness; heating it to imidize, setting a maximum imidization temperature to exceed fusion point of the fluororesin; and separating the die and the tubular object after cooling off. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
