WATERBORNE COATING COMPOSITIONS HAVING IMPROVED METALLIC PIGMENT ORIENTATION

摘要

A waterborne coating composition contains a polymeric film-forming resin in aqueous medium and from about 1 to about 40 percent by weight based on the resin solids of the composition of an oligomeric ester of structure (I), where X is the residue of a polyol after reaction with an acid or an anhydride, R is an organic moiety associated with the acid or anydride and A has an average value of about 2 or greater. The waterborne coating compositions are particularly advantageous as metallic pigmented coating compositions for automotive basecoat applications because they exhibit excellent resistance to mottling, have good flop and have reduced sensitivity to fluctuations in relative humidity.