A coating material for ink jet printing paper was made by mixing 40-60nm size alumina sol with PVA binder. Alumina sol were made after dispersing the primary alumina particles (size 10x25nm) which are needle shape, Boehmite type and have nano size porosity in water. The coating material was cross-linked by adding zirconium compounds or boric compounds. After cross-linking, the coating material was coated on the base paper (polyethylene coated paper) by 32±1μm thickness. The inkjet printed color image of coated paper cross-linked by zirconium compounds showed better results in both physical properties (water resistance, environmental resistance, humidity resistance and adhesion strength) and optical density.
Tai Sung Kang, Myung Cheon Lee, "The Effect of Cross Linking Agent on the Image Quality of Alumina sol coated Ink jet Paper" in Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP22), 2006, pp 552 - 554, https://doi.org/10.2352/ISSN.2169-4451.2006.22.1.art00061_2