PARTICULATE COATING HAVING IMPROVED CHIP RESISTANCE, UV DURABILITY, AND COLOR STABILITY

摘要

The invention provides powder coatings having at least 25% by weight of an epoxy functional particulate component (a) having a Tg of at least 50°C and of the structure (I), wherein n is a number from 0 to 50, and R1 is selected form the group consisting of linear, branched or cycloaliphatic C2-C20 alkyl groups and mixtures thereof, based on the total weight of all epoxy functional particulate components in the powder coating composition. The powder-coating compositions of the invention are suitable for use as primers over electrocoat and under composite basecoat/clearcoat systems. Powder primers of the invention provide simultaneous improvements in yellowing, chip resistance, UV durability and color stability.