Coating compositions for aluminum beverage cans and methods of coating same
AssigneeValspar Sourcing, Inc.
InventorsRobert M. O'Brien, Daniel E. Rardon, Rachael Ann Spynda, George K. Bartley, Richard H. Evans
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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.
Claims98
An inside spray beverage can coating composition, comprising an emulsion polymerized latex polymer prepared by emulsion polymerizing an ethylenically unsaturated monomer component in the presence of an aqueous dispersion of a salt of an organic-solution polymerized acid- or anhydride-functional acrylic polymer and a tertiary amine;
- wherein:
- the salt of the organic-solution polymerized acid- or anhydride-functional acrylic polymer comprises more than 15 wt-% acid- or anhydride-functional monomers, based on the weight of polymerizable unsaturated monomer used to generate the acid-or anhydride-functional acrylic polymer;
- and
- the ethylenically unsaturated monomer component includes an alkyl (meth)acrylate, a vinyl aromatic compound and an oxirane-group containing monomer;
- the inside spray beverage can coating composition is substantially free of mobile and bound bisphenol A;
- the inside spray beverage can coating composition, when spray applied onto an interior of a 12 ounce two-piece drawn and ironed aluminum beverage can at 120 to 130 milligrams per can coating weight and cured at 188° C. to 199° C. (measured at the can dome) for 30 seconds, exhibits:
- (i) a global extraction result of less than 50 ppm;
- and
- (ii) a metal exposure of less than 3 mA on average when the can is filled with 1% NaCI in deionized water and tested pursuant to the Initial Metal Exposure test method disclosed herein;
- and
- the inside spray beverage can coating composition is made without using PVC compounds.
An inside spray beverage can coating composition, comprising:
- an emulsion polymerized latex polymer that is substantially free of bound hisphenol A and bound aromatic glycidyl ether compounds and is prepared by emulsion polymerizing an ethylenically unsaturated monomer component in the presence of an aqueous dispersion of a salt of an organic-solution polymerized acid- or anhydride-functional acrylic polymer and a tertiary amine, wherein the ethylenically unsaturated monomer component includes an alkyl (meth)acrylate, a glycidyl ester of an alpha, beta-ethylenically unsaturated acid or anhydride, and a vinyl aromatic component that is at least 20 wt-% of the ethylenically unsaturated monomer component;
- and
- a phenoplast crosslinker;
- wherein the inside spray beverage can coating composition is made without using PVC compounds.
An inside spray beverage can coating composition, comprising an emulsion polymerized latex polymer prepared by emulsion polymerizing an ethylenically unsaturated monomer component in the presence of an aqueous dispersion of a salt of an organic-solution polymerized acid- or anhydride-functional acrylic polymer and a tertiary amine;
- wherein:
- the salt of the organic-solution polymerized acid- or anhydride-functional acrylic polymer comprises more than 15 wt-% acid- or anhydride-functional monomers, based on the weight of polymerizable unsaturated monomer used to generate the acid- or anhydride-functional acrylic polymer;
- the ethylenically unsaturated monomer component includes at least 40 wt-% of one or more monomers selected from alkyl acrylates and methacrylates and from more than 1 wt-% to 20 wt-% of an oxirane-group containing monomer;
- and
- the inside spray beverage can coating composition is substantially free of mobile and bound bisphenol A.
An inside spray beverage can coating composition, comprising an emulsion polymerized latex polymer prepared by emulsion polymerizing an ethylenically unsaturated monomer component in the presence of an aqueous dispersion of a salt of an organic-solution polymerized acid- or anhydride-functional acrylic polymer and a tertiary amine;
- wherein:
- the salt of the organic-solution polymerized acid- or anhydride-functional acrylic polymer comprises more than 15 wt-% acid- or anhydride-functional monomers, based on the weight of polyrnerizable unsaturated monomer used to generate the acid- or anhydride-functional acrylic polymer;
- the ethylenically unsaturated monomer component includes an alkyl (meth)acrylate, at least 20 wt-% of styrene, and glycidyl (meth)acrylate;
- and
- the inside spray beverage can coating composition is substantially free of mobile and bound bisphenol A.
An inside spray beverage can coating composition, comprising an emulsion polymerized latex polymer prepared by emulsion polymerizing an ethylenically unsaturated monomer component in the presence of an aqueous dispersion of a salt of an organic-solution polymerized acid- or anhydride-functional acrylic polymer and a tertiary amine;
- wherein:
- the ethylenically unsaturated monomer component includes at least 40 wt-% of one or more monomers selected from alkyl acrylates and methacrylates, at least 20 wt-% of styrene, and glycidyl methacrylate;
- and
- the inside spray beverage can coating composition is substantially free of mobile and bound bisphenol A.
An inside spray beverage can coating composition, comprising:
- an emulsion polymerized latex polymer prepared by emulsion polymerizing an ethylenically unsaturated monomer component in the presence of an aqueous dispersion of a salt of an acid- or anhydride-functional acrylic polymer and a tertiary amine;
- wherein the polymerizable unsaturated monomers used to generate the acid- or anhydride-functional acrylic polymer includes methacrylic acid and does not include acrylic acid;
- wherein the ethylenically unsaturated monomer component includes at least 40 wt-% of one or more monomers selected from alkyl acrylates and methacrylates, at least 20 wt-% of styrene, and glycidyl methacrylate;
- and wherein the ethylenically unsaturated monomer component does not include acrylamide, methacrylamide, N-isobutoxymethyl acrylamide, or N-butoxymethyl acrylamide;
- and
- a phenoplast crosslinker;
- wherein the inside spray beverage can coating composition is substantially free of mobile and bound bisphenol A.
An inside spray beverage can coating composition, comprising an emulsion polymerized latex polymer prepared by emulsion polymerizing an ethylenically unsaturated monomer component in the presence of an aqueous dispersion of a salt of an organic-solution polymerized acid- or anhydride-functional acrylic polymer and an amine;
- wherein;
- the salt of the organic-solution polymerized acid- or anhydride-functional acrylic polymer comprises more than 15 wt-% acid- or anhydride-functional monomers, based on the weight of polyinerizable unsaturated monomer used to generate the acid- or anhydride-functional acrylic polymer;
- the ethylenically unsaturated monomer component includes at least 40 wt-% of one or more monomers selected from alkyl acrylates and methacrylates and 0 to 30 wt-% of an oxirane-group containing monomer, and wherein at least a portion of the one or more alkyl acrylates and methacrylates is hydroxyl functional;
- and
- the ethylenically unsaturated monomer component does not include acrylamide, methacrylamide, N-isobutoxymethl acrylamide, or N-butoxymethyl acrylamide;
- and
- the inside spray beverage can coating composition is substantially free of mobile and bound bisphenol A.
Dependencies are inferred from the claim text.