CARBAMATE-FUNCTIONAL, RESINS AND THEIR USE IN HIGH SOLIDS COATING COMPOSITIONS

摘要

The present invention provides a coating composition containing 1) a carbamate-functional resin having in its structure a hyperbranched or star polyol core,a first chain extension based on a polycarboxylic acid or anhydride, a secondchain extension based on an epoxy containing compound, and having carbamatefunctional groups on the core, the second chain extension, or both; and 2) asecond resin containing functional groups reactive with the carbamate groupson the carbamate-functional resin. In one embodiment, the coating compositionsare used as a clearcoat to be applied over a basecoat to form a compositecoating. The compositions exhibit a combination of desirable properties, suchas scratch and mar resistance, resistance to environmental etch, goodintercoat adhesion, and high solids.