Coating compositions for packaging articles such as food and beverage containers
AssigneeValspar Sourcing, Inc.
InventorsSebastien Gibanel, Benoit Prouvost
Life of this patent
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Abstract
An article, comprising a packaging article such as food or beverage container (20), or a portion thereof, that includes a substrate (30, 32) and a coating (34) disposed on at least a portion of the substrate (30, 32). The coating (34) is preferably formed from a coating composition that comprises a latex emulsion having a first-stage copolymer, a second-stage copolymer, and a linkage interconnecting the first-stage copolymer and the second-stage copolymer prior to curing.
Claims23
A coating composition comprising an emulsion polymerized latex, wherein the polymerized latex is a reaction product of a method comprising:
- providing a first-stage copolymer having step-growth-functional groups;
- grafting a linkage monomer to one of the step-growth-functional groups on the first-stage copolymer to provide at least one pendant linkage group bonded to the first stage copolymer;
- and
- emulsion polymerizing a plurality of second-stage monomers, wherein at least about 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 chemically different from the first-stage copolymer;
- wherein the second-stage copolymer is linked to the first-stage copolymer with a linkage derived from the pendant linkage group;
- the coating composition is substantially free of structural units derived from each of bisphenol A, bisphenol F, bisphenol S, or any diepoxides thereof;
- and
- the coating composition is suitable for forming an inside spray coating for an aluminum food or beverage can.
Dependencies are inferred from the claim text.