| 摘要 |
<p>PURPOSE:The titled thin film, obtained by partially cyclizing an amphoteric polyimide precursor having specific repeating units, having improved heat and chemical resistance, electrical insulating properties, mechanical characteristic, etc., and useful as electrical and electronic devices, etc. CONSTITUTION:A thin film obtained by partially imidating an amphoteric polyimide precursor having repeating units expressed by the formula (R<1> is >=2C tetrafunctional group; R<2> is >=2C bifunctional group; R<3>-R<6> are 1-30C monofunctional aliphatic group, monofunctional cyclic aliphatic group, monofunctional group formed by linking an aromatic group to an aliphatic group, group formed by substituting the above-mentioned groups with halogen, nitro, amino, cyano, methoxy or acetoxy group or H, provided that at least one, preferably 2 of R<3>-R<6> are not 1-11C group or H).</p> |
