CURABLE COATING COMPOSITION WITH IMPROVED DURABILITY

摘要

The present invention provides a curable coating composition that includes a film-forming polymer, a polymeric additive having at least one bound surface protecting group, and a crosslinker that is reactive with the film-forming polymer. The polymeric additive is substantially free of groups reactive with the crosslinker and has comonomer units with aryl groups, alkyl groups having, on average, four or more carbon atoms, or combinations of the aryl and alkyl groups. When the coating composition is cured to form a cured coating layer, the concentration of the polymeric additive in the upper about 50 % of the cured coating layer thickness is at least about 10 % higher than the concentration of the polymeric additive in the rest of the cured coating layer.