Invention Grant
- Patent Title: Multi-stage polymeric latexes, coating compositions containing such latexes, and articles coated therewith
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Application No.: US16805579Application Date: 2020-02-28
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Publication No.: US11427654B2Publication Date: 2022-08-30
- Inventor: Robert M. O'Brien , Mark Stuetelberg , Joseph D. Desousa , Mary Jo Scandolari , Nikolaus Koch , Stephen Pollin , Nusrah Hussain
- Applicant: SWIMC LLC
- Applicant Address: US OH Cleveland
- Assignee: SWIMC LLC
- Current Assignee: SWIMC LLC
- Current Assignee Address: US OH Cleveland
- Agency: Patterson Thuente Pedersen, P.A.
- Main IPC: B65D25/14
- IPC: B65D25/14 ; C09D133/12 ; C09D5/02 ; C09D7/40 ; C08F2/00 ; C09D133/26

Abstract:
An aqueous coating composition useful in coating a variety of substrates, including interior or exterior portions of food or beverage cans. The coating composition includes a multi-stage polymeric latex having two or more emulsion polymerized stages in an aqueous carrier liquid, wherein the latex has one or both of: (i) a lower glass transition temperature (Tg) emulsion polymerized stage having a calculated Tg that is at least 20° C. lower than a calculated Tg of a higher Tg emulsion polymerized stage, or (ii) a gradient Tg with at least a 20° C. differential in the calculated Tg of monomers fed at the start of polymerization compared to monomers fed at the end of polymerization. When spray-applied on the interior of a food or beverage can, the composition exhibits a global extraction result of less than 50 ppm and a metal exposure value of less than 3 mA.
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