| 摘要 |
<p>Water based primer-surfacer compositions for application in the automotive industry over bare or treated metal and under a top coat of acrylic lacquer or enamel are formulated in aqueous medium using a latex of an addition copolymer prepared by emulsion polymerization of a mixture of styrenic and acrylic monomers, with hydroxyl and carboxyl functionality, preferably a mixture of styrene, ethyl acrylate, 2-hydroxy-ethyl methacrylate and acrylic acid. The latex is the predominant film forming ingredient in the composition and is combined with minor amounts of other film forming ingredients including a water soluble epoxy ester, preferably derived from bisphenol A, diglycidyl ether, drying oil fatty acids and maleic anhydride and water soluble or dispersible aminoplast resins, preferably methoxylated melamine formaldehyde resin and butoxylated urea formaldehyde resin. Pigments are also normally present in the composition.</p> |
