| 摘要 |
<p>The invention provides a thermosetting aqueous primer composition that includes a dispersed polyurethane poly-mer, an acrylic polymer emulsion polymerized in the presence of the polyurethane dispersion, and a crosslinking component that is reactive with at least one of the polyurethane polymer and the acrylic polymer. The polyurethane polymer has a glass transition temperature of 0.degree.C or less. The acrylic polymer has a glass transitio n temperature that is at least about 20 .degree.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.</p> |
