| 摘要 |
A medical tube (10) obtained through thermal curing and comprising mixed ingredients comprising a polyimide resin (11) and fluororesins (12, 13, and 14), wherein the fluororesins (13 and 14) have come, through melting, into the state of being exposed in at least the inner surface of the polyimide resin (11) and the inner surface or the inner and outer surfaces of the tube are surfaces having a low frictional resistance. This tube is obtained by: polymerizing an aromatic tetracarboxylic dianhydride with an aromatic diamine in a polar solvent to form a polyimide precursor solution; adding a fluororesin to the polyimide precursor solution or during the polymerization step to prepare a mixture solution comprising the polyimide precursor and the fluororesin; applying the mixture solution to the outer surface of a core wire in a given thickness; heating the coating to convert the precursor into an imide, the maximum temperature in this conversion being regulated to a temperature exceeding the melting point of the fluororesin; cooling the coated core wire; and then separating the resultant medical tube from the core wire. The medical tube has a small outer diameter, a thin wall, and high mechanical properties. The inner surface or the inner and outer surfaces of this tube have a low frictional resistance.
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