US 12,441,817 B2
Multi-stage polymeric latexes, coating compositions containing such latexes, and articles coated therewith
Robert M. O'Brien, Monongahela, PA (US); Mark Stuetelberg, Hiawatha, KS (US); Joseph D. Desousa, Pittsburgh, PA (US); Mary Jo Scandolari, Coraopolis, PA (US); Nikolaus Koch, Greensburg, PA (US); Stephen Pollin, Ambridge, PA (US); and Nusrah Hussain, Gibsonia, PA (US)
Assigned to SWIMC LLC, Cleveland, OH (US)
Filed by SWIMC LLC, Cleveland, OH (US)
Filed on May 6, 2024, as Appl. No. 18/656,283.
Application 18/656,283 is a continuation of application No. 17/882,330, filed on Aug. 5, 2022, granted, now 12,006,380.
Application 17/882,330 is a continuation of application No. 16/805,579, filed on Feb. 28, 2020, granted, now 11,427,654, issued on Aug. 30, 2022.
Application 16/805,579 is a continuation of application No. PCT/US2018/049059, filed on Aug. 31, 2018.
Claims priority of provisional application 62/725,196, filed on Aug. 30, 2018.
Claims priority of provisional application 62/553,309, filed on Sep. 1, 2017.
Prior Publication US 2024/0400724 A1, Dec. 5, 2024
Int. Cl. C08F 2/00 (2006.01); B65D 25/14 (2006.01); C09D 5/02 (2006.01); C09D 7/40 (2018.01); C09D 133/12 (2006.01); C09D 133/26 (2006.01)
CPC C08F 2/001 (2013.01) [B65D 25/14 (2013.01); C09D 5/024 (2013.01); C09D 7/40 (2018.01); C09D 133/12 (2013.01); C09D 133/26 (2013.01)] 27 Claims
 
1. An aqueous interior spray beverage container coating composition comprising a multi-stage polymeric latex having two or more emulsion polymerized ethylenically unsaturated monomer stages, wherein the latex has a lower Tg emulsion polymerized stage having a calculated Tg that is at least 35° C. lower than a calculated Tg of a higher Tg emulsion polymerized stage, wherein the coating composition includes, based on total resin solids, at least 50 wt. % of the two or more emulsion polymerized stages;
wherein the coating composition includes from 15 wt. % to 25 wt % of solids, is substantially free of each of bisphenol A, bisphenol F, and bisphenol S, and includes or is derived from no more than 0.5 wt. % of acrylamide-type monomers, if any, based on the aggregate weight of polymerizable monomers employed to make the latex;
wherein the coating composition, when spray applied onto an interior of a 355 mL no. 211 two-piece drawn and ironed aluminum beverage can at 115 milligrams per can coating weight and cured at 188° C. to 199° C. (measured at the can dome) for 55 seconds exhibits:
(i) a global extraction result of less than 50 ppm,
(ii) a metal exposure of less than 3 mA on average when the can is filled with 1% NaCl in deionized water and tested pursuant to the Initial Metal Exposure test method disclosed herein,
(iii) a metal exposure of less than 3.5 mA when tested pursuant to the Metal Exposure after Drop Damage test disclosed herein, and
(iv) a measured Tg of at least 50° C.
 
23. An aqueous interior spray beverage container coating composition comprising a multi-stage polymeric latex having two or more emulsion polymerized ethylenically unsaturated monomer stages, wherein the latex has a lower Tg emulsion polymerized stage having a calculated Tg that is at least 40° C. lower than a calculated Tg of a higher Tg emulsion polymerized stage, wherein the coating composition includes, based on total resin solids, at least 70 wt. % of the two or more emulsion polymerized stages;
wherein the coating composition:
includes from 15 wt. % to 25 wt % of solids,
has a viscosity of from 20 to 80 seconds (Ford Cup #2, 25° C.),
is substantially free of each of bisphenol A, bisphenol F, and bisphenol S,
is not prepared using halogenated monomers, and
includes or is derived from no more than 0.5 wt. % of acrylamide-type monomers, if any, based on the aggregate weight of polymerizable monomers employed to make the latex;
wherein the coating composition, when spray applied onto an interior of a 355 mL no. 211 two-piece drawn and ironed aluminum beverage can at 115 milligrams per can coating weight and cured at 188° C. to 199° C. (measured at the can dome) for 55 seconds exhibits:
(i) a global extraction result of less than 50 ppm,
(ii) a metal exposure of less than 3 mA on average when the can is filled with 1% NaCl in deionized water and tested pursuant to the Initial Metal Exposure test method disclosed herein,
(iii) a metal exposure of less than 3.5 mA when tested pursuant to the Metal Exposure after Drop Damage test disclosed herein, and
(iv) a measured Tg of at least 70° C.