LOW VOC WATERBORNE PRIMER WITH HIGH FILM SMOOTHNESS

摘要

An aqueous thermosetting primer composition includes a polyurethane polymer, an acrylic polymer polymerized in a wax having active hydrogen functionality, and a crosslinking component that is reactive with the wax and at least one of the polyurethane polymer and the acrylic polymer. The polyurethane polymer has a glass transition temperature of 0°C or less. The acrylic polymer has a glass transition temperature that is at least about 20°C higher than the glass transition temperature of polyurethane resin. The invention further provides a composite coating having as a primer layer a cured layer of the primer composition of the invention and having at least one topcoat layer.