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US 8,617,663 B2Granted
Coating compositions for cans and methods of coating
AssigneeValspar Sourcing, Inc.
InventorsRobert M. O'Brien, Daniel E. Rardon, Rachael Ann Spynda, George K. Bartley, III, Richard H. Evans
Life of this patent
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Abstract
A coating composition for a food or beverage can that includes an emulsion polymerized latex polymer formed by combining an ethylenically unsaturated monomer component with an aqueous dispersion of a water-dispersible polymer.
Claims35
A method, comprising the steps of:
- (a) providing a latex-based coating composition that includes one or more polymers, wherein the one or more polymers are formed by polymerizing one or more ethylenically unsaturated monomers, wherein the ethylenically unsaturated monomers include (i) one or more oxirane functional group-containing monomers, (ii) one or more acid-functional monomers and (iii) one or more additional ethylenically unsaturated monomers selected from butyl (meth)acrylate or styrene, wherein the one or more oxirane functional-group containing monomers are polymerized into the one or more polymers using an emulsion polymerization, and wherein the coating composition is not made using PVC compounds and is substantially free of bound BPA and aromatic glycidyl ether compounds;
- and
- (b) spray applying the coating composition to an interior surface of a food or beverage can or a portion thereof.
A method, comprising the steps of:
- (a) providing an aqueous coating composition that includes a latex polymer that is substantially free of bound BPA and aromatic glycidyl ether compounds and is made without using PVC compounds, wherein the latex polymer is formed by emulsion polymerizing a mixture of ethylenically unsaturated monomers comprising 0.1 to 30 weight percent oxirane functional group-containing monomer, based on the weight of the mixture, in the presence of an acid- or anhydride-functional polymer;
- and
- (b) spray applying the coating composition to an interior surface of a food or beverage can or a portion thereof.
A method, comprising the steps of:
- (a) providing an aqueous coating composition that includes a latex polymer that is substantially free of bound BPA and aromatic glycidyl ether compounds, wherein the latex polymer is formed by emulsion polymerizing a mixture of ethylenically unsaturated monomers comprising butyl acrylate, styrene, and 0.1 to 30 weight percent of oxirane functional group-containing monomer, based on the weight of the mixture, in the presence of an acid- or anhydride-functional acrylic polymer having an acid number of at least 40 milligrams KOH per gram resin;
- and
- (b) spray applying the coating composition to an interior surface of a food or beverage can or a portion thereof.
Dependencies are inferred from the claim text.