Interactions of Styrene Maelic Anhydride Imide Resin in Paper Coating for Inkjet Application and its Influence on Wet Coating Structure, 2005 Coating Conference

Demand for high quality digital prints has lead to the incorporation of several innovative ideas in to the development of printing substrate. The printing substrate, especially for inkjet printing had undergone some major changes with respect to the structure and surface properties of the coating. There have been considerable research done to understand the interactions and effect of common poly-cationic additive in paper coating for ink-jet printing on the print quality and coating rheology; but there has been limited effort to understand the influence of a cationic polymers on the viscoelastic properties and subsequent wet coating structure and dry coating structure. One of the most commonly used cationic polymers today in paper coating is Poly-diallyldimethylammoniumchloride (PD) and its effect on print quality and coating rheology has been discussed elsewhere. In this study, a new functional polymer Styrene Maelic Anhydride Imide (SMAI) is investigated as a new cationic additive with respect to its impact on the coating rheology and its influence on wet coating structure. Precipitated Calcium Carbonate (PCC) pigment based coating colors were prepared using SMAI as cationic additive. Control colors were also investigated with PD as cationic additive. Steady and dynamic oscillatory shear experiments were conducted on different coating color to understand the effect of cationic polymer on the suspension rheology. SMAI as cationic additive, in addition to improving the print quality, (1) has found to impart a stronger wet coating structure, which can lead to bulkier coating structure (6) that’s favorable for interacting with inkjet ink.