Abstract: A self-priming rapid curing chromate free corrosion resistant coating composition based on a random polyvinyl terpolymer and an alkyd resin with a hydroxyl number between 80–200 in association with a mineral acid catalyst, at least one organic solvent and a drying agent wherein the vinyl terpolymer is predominantly a polyvinyl formal with polyvinyl alcohol and polyvinyl acetate as the other two co-polymers, the terpolymer cross linking through its hydroxyl groups with the alkyd resin in the composition during curing. The composition can be applied as a clear coat or as a pigmented composition with addition of pigments on ferrous and non-ferrous metallic substrate and is suitable for continuous coil coating lines. A method of coating a ferrous and non-ferrous metallic substrate by applying a coating composition on its surface and coated articles so produced.

Abstract: The invention discloses self-priming coating composition based on a vinyl terpolymer, a monomeric or oligomeric alkoxy amino resin cross linker and a multi component combination of two or more resins selected from (a) oligomeric saturated polyester resin, (b) oligomeric unsaturated polyester resin dissolved in an unsaturated monomer with a free radical initiator (c) oligomeric bifunctional phenolic resole resin and (d) oligomeric epoxy resin (e) low molecular weight polyurethane resin and (f) short to medium oil alkyd resin, wherein said vinyl terpolymer is predominantly polyvinyl formal with polyvinyl alcohol and polyvinyl acetate as two other co-polymers. The composition can be applied as a clear coat or as a pigmented composition with addition of pigment on ferrous and non-ferrous metallic substrate and is particularly suitable for continuous coil coating lines for both dark and light colour metal coatings.