Patent ID: 7968206

Claim:
A primer coating composition comprising a film forming binder and an organic liquid carrier, and optionally pigment(s) in a pigment to binder weight ratio of about 1:100-150:11; and the binder contains: (a) about 40 to 80% by weight, based on the weight of the binder, of a hydroxyl functional polyester resin, said hydroxyl functional polyester resin is selected from the group consisting of: a hydroxyl functional polyester resin produced from condensation reactants consisting of carboxylic acid and polyhydric alcohol, a hydroxyl functional polyester resin produced from condensation reactants consisting of acid anhydride and polyhydric alcohol, and a combination thereof; (b) about 10 to 30% by weight, based on the weight of the binder, of a crosslinking agent selected from the group consisting of a melamine resin, a blocked polyisocyanate resin, or a mixture thereof; (c) about 10 to 40% by weight, based on the weight of the binder, of a graft polymer comprising a non-crosslinked core of acrylic polymer which is substantially non-soluble in non-polar organic solvent and, grafted to the core, a plurality of substantially linear stabilizer components, each of which is soluble in organic solvent and has one end of the stabilizer molecule grafted to the core and a weight average molecular weight of about 10,000 to 100,000; wherein said primer coating composition has a total solids concentration of at least 40% based on the total weight of said primer coating composition.