Applicable Base Polymer Properties
Polyurethanes are extensively and successfully used as adhesives and sealants, and they have an excellent record of durability. Blocked prepolymers are used in some of these formulation. At room temperature these blocked compounds do not react with the polyol, thus providing long shelf life. The blocked polyurethane systems can be applied either in the form of 100% solids, solution, or aqueous systems using elevated temperatures to deblock the isocyanate which then reacts with the other components.