Author(s)

Genggongwo Shi^1,2, Kyeongha Baek¹, Jun Bae³, Lee Soon Park^1*

¹School of Material Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, South Korea.
²CCTech. Co. Ltd., Hwaseong, South Korea.
³Duksan Neolux Co., Ltd., Cheonan, South Korea.

Polyimides are well-known for their high chemical inertness and thermal stability. However, it is usually challenging to synthesize UV-curable polyimides since the imidization reaction requires such harsh conditions that acrylate type double bonds cannot withstand. In this work, synthetic methods are developed to obtain polyester-imide type binder polymers with high thermal stability, high compatibility with the other components of the black photoresist, and fine photolithographic patterning property for the negative-tone black photoresist. The syntheses of diimide-diacid or diimide-diol intermediates for the polyesterification with dianhydride gave polyester imides which meets this requirement. The photolithographic tests have shown that the patterning of the micron-sized PDL of the organic light emitting diode (OLED) panel could be obtained. This work will interest the researchers working on the design and optimization of thermally stable binder polymers.

Polyester Imide, One-Pot Solution Polymerization, Black Photoresist, Photolithography

Shi, G. , Baek, K. , Bae, J. and Park, L. (2020) Acidic Polyester Imides as Thermally Stable Binder Polymers for Negative-Tone Black Photoresist. Materials Sciences and Applications, 11, 234-244. doi: 10.4236/msa.2020.114016.