| abstract |
Disclosed is an epoxy resin or hybrid resin-based powder coating composition, which comprises, as a hardener, a mixture of (a) a salt of a polycarboxylic acid (other than isophthalic acid, terephthalic acid and phthalic acid) and an amine or guanidine, such as the salt between pyromellitic acid and 2-phenylimidazoline, and (b) a polycarboxylic acid, preferably selected from the group consisting of cyanuric acid, ethylenediaminetetraacetic acid, isophthalic acid, terephthalic acid, 1,2,3,4-butanetetracarboxylic acid, trimellitic acid and trimesic acid. The coating composition is useful for producing a semi-gloss to matt coating layer. |