| abstract |
The present invention relates to a colorless polyimide resin, a liquid crystal alignment film and a film using the same, 4,4'- (4,4'-isopropylidene dephenoxy) bis (phthalic anhydride) as an aromatic dianhydride By providing a colorless and transparent polyimide resin containing (HBDA) and containing a single or two or more compounds selected from diamines and fluorine-containing diamines having a soft group as aromatic diamines, colorless and transparent, mechanical and thermal stability Excellent polyimide resin, liquid crystal alignment film and film using the same as semiconductor insulating film, TFT-LCD insulating film, transparent electrode film, passivation film, liquid crystal alignment film, optical communication material, solar cell protective film, flexible display substrate, etc. It is an invention that can be provided. |