POLYIMIDE COLORLESS TRANSPARENT THIN FILM, PREPARATION METHOD THEREFOR, AND OPTICAL PI FILM

摘要

The present invention provides a polyimide colorless transparent thin film, preparation method therefor, and an optical PI film. The polyimide colorless transparent thin film not only has excellent light transmittance (≥ 85% @ 500 nm), but also has the characteristics such as high modulus (tensile modulus ≥ 3.8 GPa) and low coefficient of thermal expansion (≤30 ppm/°C, 50-200°C), and can satisfy the usage requirements of a flexible photoelectric display device.