Rheology modifiers, surfactants and foam control agents play an integral role in the processes associated with the manufacture, deposition, film formation, and film build of water-borne coatings, as well as the final properties and performance of the dry coating film. Nonionic synthetic associative thickeners (NSATsj represent a class of rheology modifiers, due to the thickening mechanism associated with the hydrophobic groups, can self-associate or interact with other coatings components, such as latex and pigment particles. A new family of NSATs, marketed under the brand name Aquaflovf~(TM), has been developed by Ashland Aqualon Functional Ingredients, a commercial unit of Ashland Inc., for modifying the rheology of a very wide range of waterborne coating systems. The new technology allows for optimal formulation of low- VOC (volatile organic compounds), decorative coatings that are applied by brush or roller, have optimal thickening efficiency, "no-drip" sag resistance, and excellent leveling properties. The same unique NSAT chemistry also enables for-mulators to design highly viscous wood coatings for airless or airmix spray application that have excellent film build and sag resistance combined with optimal flow and leveling.
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