| 摘要 |
PROBLEM TO BE SOLVED: To solve problems such as residual voids, blisters, and thickness unevenness in a film of a tubular product in the tubular polyimide resin product produced by using a polyimide precursor solution as a starting material. SOLUTION: The tubular polyimide resin product is one obtained by imidizing a polyimide precursor solution prepared by reacting as principal components diamines of formula (A) and formula (B) or their derivatives with acid anhydrides of formula (C) and formula (D) and having a water vapor permeability in the range of 3 to 50 g/m<SP>2</SP>×24 hr as measured on a film of the tubular product. COPYRIGHT: (C)2006,JPO&NCIPI
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