The Waterborne Symposium

Abstract
Novel Silyl-Polyurethane Crosslinkers for Scratch and Stain Resistant NISO Coatings
Co-authors: Tobias Unkelhӓuβer, and Michael Brignone

Traditional two-component polyurethanes are known for their high chemical resistance, weatherability, and toughness.    The high reactivity of the isocyanate group that imparts fast cure also requires appropriate personal protective equipment for proper handling to ensure that the applicator is protected from exposure.  Non-isocyanate-based polyurethane coatings are of interest principally as they could potentially impart the physical properties of polyurethanes while providing easier handling.
This paper presents a new technology based on silane-functional polyurethane crosslinkers that can be used in either 1K or 2K polyurethane coatings, and for either ambient or heat-cured systems.  These silane functional crosslinkers can react via moisture cure with themselves or with hydroxy functional resins similar to a standard polyurethane.  These systems have shown remarkable resistance to graffiti and stains, and are good for both architectural and wood coatings.  Their mar resistance and scratch resistance are exceptional compared to standard polyurethanes.  These findings will be presented in this paper.