| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of producing a polyimide resin layer having excellent dimensional stability in a short heat-treatment period and, consequently, to remarkably increase the productivity of a flexible laminated sheet having the polyimide resin layer. SOLUTION: A polyimide precursor resin having a structural unit expressed by formula (1) and a nitrogen-containing aromatic heterocyclic compound as a cure accelerator of the polyimide precursor resin are dissolved in an organic polar solvent, the obtained solution containing the polyimide precursor resin is applied to a substrate and the product is dried and imidized by the subsequent heat-treatment to complete the formation of a polyimide resin layer within a temperature range of 280-380°C while controlling the linear thermal expansion coefficient of the obtained polyimide resin layer within the range of 10-20 ppm/K. COPYRIGHT: (C)2008,JPO&INPIT
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