Non-ionic associative rheology modifiers (RM), such as hydrophobically modified ethylene oxide urethanes (HEUR), are used widely in waterborne coatings for their desirable rheological and application properties. The development of low and zero VOC coatings relies on innovative technologies to enable such VOC levels while achieving high performance coating systems that are cost effective. To achieve practical viscosities, associative rheology modifiers are often supplied in water/solvent solutions, and thus contribute VOC to the coating. Further, today’s home is increasingly being painted with deep, vibrant colors which require coatings to be tinted with high colorant levels leading to significant decreases in viscosity. This decreased viscosity leads to coating defects, including low sag resistance and poor film build.
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