Process for making polymer coated aluminum alloy sheet suitable for shaping into a food or beverage container and polymer coated aluminum alloy sheet per se

摘要

The present invention relates to a process for making polymer coated aluminum alloy sheet suitable for shaping into a food or beverage container body or container end panel, said production process comprising: (a) providing an aluminum alloy sheet having a surface portion comprising aluminum oxide or aluminum hydroxide; (b) coating said surface portion with a primer composition comprising an aqueous solution consisting essentially of water and a vinylphosphonic acid-acrylic acid copolymer, thereby forming a primer layer comprising a reaction product of said copolymer and said oxide or hydroxide; and (c) coating said primer layer with a coating composition comprising a polymer selected from the group consisting of polyvinyl chloride, epoxies and polyesters. The invention also relates to the polymer coated aluminum alloy sheet made in the above-described manner and shaped into a container bodies or container end panels intended for storage of foods and beverages.