Pigmented Formulations Containing Biobased Nanoparticle Binders for Curtain Coating Applications; Part 1: Rheological Study, PaperCon 2016 

In this study, a conventional styrene-butadiene-acrylonitrile (XSB) latex binder was partially replaced with a biopolymer nanoparticle based latex binder in a curtain coating formulation.  In addition, a petro-based extensional viscosity modifier commonly used in curtain coating applications was replaced with an inorganic rheology modifier.  The results of this work demonstrate that the interaction between biopolymer nanoparticles and inorganic rheology modifier can improve the rheological properties of curtain coatings in terms of viscosity shear rate dependence, viscoelasticity, and extensional viscosity.  Two proprietary inorganic compounds used as rheology modifiers were found to disperse more readily than the petro-based extensional viscosity modifier, and coating performance was dependent on their specific addition ratio in direct proportion to the level of biobased latex in the coatings.  In addition to analyzing the extensional viscosity of the coatings using Capillary Break-up Extensional Rheometry (CaBER), a new and simple method called SPOT (Squeeze/Pull-off Test) was explored using a dynamic stress rheometer.  This SPOT method was demonstrated to be a convenient and effective means of analyzing extensional viscosity of pigmented coating formulations. 

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