ULTRA LOW VOC POLYURETHANE COATINGS.

摘要

This invention relates improved two part, low VOC polyurethane coatings comprising a low viscosity polyisocyanate component having an isocyanate functionality greater than two and a polyol component having a functionality equal to or greater than two. The improvement resides in the utilization of a unique isocyanate component in the two part polyurethane coating formulation. The component comprises said low viscosity polysocianate component and an isocyanate terminated or end capped prepolymer formed by the reaction of a disocianate and a multifunctional polyol, the prepolymer having at least about 85 preferably 90 percent by weight of a 2:1 adduct of isocyanate to polyol (NCO/OH) and less than about 1 and preferably less than about 0.5 percent by weight of residual disocyanate monomer therein.