| 摘要 |
PURPOSE:To prepare a polyimide film subjected to surface roughening treatment while keeping the excellent physical properties, heat resistance, etc., essential to an aromatic polyimide film to a high level, excellent in slippage and adhesion and, therefore, applicable, e.g. to a film for FPC or a base film for a double layer film. CONSTITUTION:This method is to produce a surface-roughened polyimide film by mixing the first aromatic polyamic acid solution prepared from a two benzene ring-containing aromatic tetracarboxylic acid component and an aromatic diamine component with the second aromatic polyamic acid solution prepared from a one benzene ring-containing aromatic tetracarboxylic acid component and an aromatic diamine component so that the weight ratio of the aromatic polyamic acids may be 9:1 to 6:4, casting the resultant mixture for formation of film, imidating it and treating the imidated film with an alkaline solution. |
