Coating compositions for packaging articles such as food and beverage containers

A method of making an inside spray coating composition for food or beverage containers, the method comprising:

• emulsion polymerizing first-stage monomers in an aqueous carrier to produce a first-stage copolymer comprising water-dispersing groups;
• emulsion polymerizing second-stage monomers, wherein at least 5% by weight of the second-stage monomers are chemically different from the first-stage monomers, in the presence of the first-stage copolymer to form a second-stage copolymer, wherein the second-stage copolymer is chemically different from the first-stage copolymer, and wherein the second-stage copolymer comprises a curing group configured to react with the first-stage copolymer during a curing step;
• and
• formulating the coating composition for a spray coating application, wherein the coating composition is substantially free of one or more, or all, of structural units derived from each of (meth)acrylamide-type monomers and bisphenol A, and wherein the coating composition spray-applied onto an interior of a 12 ounce two-piece drawn and ironed aluminum beverage can and cured at 188° C. to 210° C. (measured at the can dome) for 60 seconds provides an inside spray beverage can coating with an average film thickness of about 0.7 mg/in2 to about 4.0 mg/in2, and the can coating exhibits a global extraction result of less than 50 ppm as measured according to the extraction procedure in 21 C.F.R. § 175.300, paragraphs (d)-(e).