To obtain a water-based coating material that does not use a bisphenol A-derived constituent component at all, does not substantially use a surfactant being a causative substance for deteriorating steam sterilization resistance of a cured coating film after baking, forms a polymer emulsion and foams a coating film having excellent steam sterilization resistance, processability and adhesivity and not causing change of fragrance and flavor of beverage and is suitable for can inner surface coating.
The water-based coating material comprises a polymer emulsion obtained by radically polymerizing a component (B) to be emulsified containing an ethylenic unsaturated monomer (B1) but not a polyester in the presence of (1) an aqueous solution or emulsion of a polymer containing a carboxy group-containing polyester (A), a basic compound (C) and water (D). The ethylenic unsaturated monomer (B1) comprises at least one kind of an amide-based monomer as an essential component.
ODA KATSUYUKI
NAKAJIMA YOSHIMOTO
