Abstract:The low viscosity poly(acrylic acid acrylamide) (P(AA-co-AM)) resin was synthesized by solution polymerization using acrylicacid and acrylamide as the monomers. The properties of the resin were characterized by rotational viscometer and thermogravimetric analyser. A new type of indium tin oxide (ITO) etching ink was prepared using P(AA-co-AM) resin as connection material. The water retention property, pH change and etched image resolution of the ink were evaluated. Results showed that the suitable resin can be prepared by optimizing the synthesis process. The so prepared resin didn't decompose beneath 150 °C. The water loss rate of the ink was range 3.68% and 5.34% after exposing to air for 3 h. The image resolution used this ink was better than the commercially available ink after storing 60 d. Moreover, the etching capability did not decline and pH value almost did not change.