Abstract
As part of an ongoing effort to develop lower toxicity, more environmentally benign coatings binder systems, a series of polymers using a novel Michael Addition reaction cure mechanism, has been developed. For the cross-linking system, a number of lower molecular weight polymers with acceptor sites have been developed. They include in the polymer chain a significant amount of prereacted polyurethane, thereby giving the cured coating the familiar properties of a high quality standard polyurethane system. The chemistry of the cure mechanism is discussed pointing out the similarities and differences between this system and standard polyurethanes, once both are well cured. Unusual features of the chemistry are highlighted.
It will be shown that, depending on the way the product is formulated, a number of desirable properties can be emphasized. Coatings based on this system are shown to have excellent chemical resistance, excellent weather resistance, and excellent flexibility. With the addition of a high quality priming system, they also have excellent corrosion resistance.
