Dynamic Water Retention Properties of Biobased Latex Containing Coating Colors, PaperCon 2013

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The following work builds upon the findings reported by the authors at PaperCon2012 on the rheological properties of biobased latex dispersions and coating colors relative to conventional coating starches and SB latex binders. Our previous work has shown that the rheological performance of biobased latex is different from conventional cooked coating starches and all-synthetic latex systems. This work focuses on the dynamic water retention and wall slip properties of the same materials to better understand coater runnability performance. The correct rheology and water retention of coating colors are important at increasing coater speeds in order to achieve good runnability, productivity and product quality. Many quality and runnability problems originate from the interaction between base paper and the water phase of the coating color. If this interaction is not controlled, an excessive material shift from the coating color to the base paper can occur. This can result in poor machine runnability, unstable systems and an uneven coating layer.