A non-yellowing coating composition particularly useful as primer that has
a low VOC and excellent adhesion and chip resistance and comprises an
aqueous coating composition having a VOC of less than 0.12 kg/L (1.0
pounds/gallon) comprising 25-70% by weight of a film forming binder and
correspondingly, 75-30% by weight of an aqueous carrier for the binder
and the composition contains pigment in a pigment to binder weight ratio
of 5/100 to 150/100 and has a pH of 7-10; wherein the binder comprises
a. 50-90% by weight, based on the weight of the binder, of a blend of the
following constituents: a dispersed acrylic polymer, a dispersed
polyester having an acid value of 15-60, a number average molecular
weight from 1500-7000 and a hydroxyl value of not more than 95 and a
hydroxy terminated component that is either a polyalkylene ether polyol
or a urethane diol or a mixture of the above hydroxy terminated
components, and b. 10-50% by weight, based on the weight of the binder,
of a water-compatible alkylated melamine formaldehyde crosslinking agent;
and wherein a hydroxy functional alkyl amine is used to neutralize the
binder and adjust the pH of the composition.