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New Matting Agents for Waterborne Coatings and Varnishes

SpecialChem / PCI Magazine – Jul 2, 2008

A good matte finish is often required in coatings formulations. In order to fully optimize this important parameter, Michelman has recently developed two wax dispersions: Michem® Guard 349 and Michem Guard 350. Both dispersions aid in imparting a matting effect to most aqueous coatings and varnishes, while enhancing other properties such as abrasion resistance and water repellency. Characterized by a large particle size, both Michem Guard 349 and 350 extend the range of existing Michelman additives for surface modification in coating applications. Building on an existing range of water-based dispersions, these new wax dispersions are designed to highlight the positive properties of large-particle-sized wax and minimize unnecessary interaction from dispersing agents. As a coating film dries, wax particles are transported to the film surface as a consequence of the turbulence flow induced by the water evaporation. Because of the large particle size, protruding wax particles create a certain degree of micro-roughness, induced as the film shrinks.

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