| 简介 |
PROBLEM TO BE SOLVED : To provide a polyimide precursor varnish which can give a polyimide having high transparency, and to provide a method for producing a polyimide varnish.SOLUTION : The method for producing a varnish containing at least an organic solvent and a polyimide precursor represented by general formula (H1) or its polyimide is characterized in that an organic solvent having a light transparency of ≥89% in an optical path length of 1 cm and a wavelength of 400 nm is used as an organic solvent (hereinafter, an organic solvent to be used) contained in the varnish to produce the varnish. (In the general formula (H1), Ais a tetravalent aliphatic group or an aromatic group; Bis a divalent aliphatic group or an aromatic group; Rand Rare each independently H, 1-6C alkyl or 3-9C alkylsilyl). |
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