| 摘要 |
PURPOSE:To obtain a polyimide varnish which can form a smooth coating film by dissolving a polyimide(precursor) in an organic solvent comprising a specified compound in a specified percentage. CONSTITUTION:A polyimide varnish which is to be applied to a supporting substrate and heat treated to form a polyimide coating film thereon and which is obtained by dissolving a polyimide (precursor) {e.g. a polyimide precursor obtained from 2,2-bis[4-(4-aminophenoxy)phenyl]propane and 1,2,3,4- cyclobutanetetracarboxylic dianhydride} in an organic solvent (e.g. M- methylpyrrolidone), wherein a propylene glycol derivative of the formula (wherein (n) is 1 or 2; and R is H, a 1-4C alkyl, an alkenyl or an alkenoyl) accounts for 5-60wt.%. |
