COLORLESS AND TRANSPARENT POLYIMIDE THIN FILM HAVING HIGH TRANSMITTANCE AND LOW PHASE DIFFERENCE, AND METHOD FOR MANUFACTURING SAME

摘要

The present invention relates to a polyamic acid precursor, a high functional polyimide thin film, and a method for manufacturing the precursor and the thin film. The polyamic acid precursor according to the present invention has excellent thermal resistance, mechanical strength, chemical resistance and scratch resistance, and can exhibit a low thermal expansion coefficient, high moisture and gas barrier properties as well as low thickness-directional phase delay, high optical transmittance, and low yellowness, etc. Also, the polyimide resin according to the present invention is produced in a form of a thin film and thus maintains clear transparency at various angles due to low thickness-directional phase delay, and accordingly is applicable to substrate materials for next-generation transparent flexible displays, semiconductor interlayer insulating materials requiring various functions and characteristics, flexible circuit substrates, semiconductor devices, etc.