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US 2014/0178616 A1Published application
Polyurethane dispersions for coating containers
AssigneePPG Industries Ohio, Inc.
InventorsCourtney Richman, John M. Dudik, Mary Ann Fuhry
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Abstract
A food or beverage container coated with a coating composition comprising an aqueous polyurethane dispersion being substantially free of vinyl monomers and polymers and having an iodine value less than 5.
Claims22
An article comprising:
- a) a metal substrate of a food or beverage container including a portion thereof,
- b) a coating composition applied on at least a portion of the substrate, the coating composition comprising an aqueous polyurethane dispersion in which the polyurethane is the reaction product of an organic polyisocyanate and a hydrophobic polyester polyol that is the reaction product of an organic polyol and a dimer fatty acid containing from 26 to 40 contiguous carbon atoms between acid groups, the dispersion being substantially free of unsaturation having an iodine value less than 5 and being substantially free of vinyl monomers and polymers.
(canceled)
(canceled)
A method of coating a food or beverage container comprising:
- a) providing a thermally crosslinkable coating composition comprising an aqueous polyurethane dispersion substantially free of unsaturation in which the polyurethane is the reaction product of an organic polyisocyanate and a hydrophobic polyester polyol that is the reaction product of an organic polyol and a dimer fatty acid containing from 26 to 40 contiguous carbon atoms between acid groups;
- the dispersion having an iodine value of less than 5 and being substantially free of vinyl monomers and polymers,
- b) depositing the coating composition to at least a portion of a planar metal substrate,
- c) heating the coated metal substrate to a peak metal temperature of at least 230° C. to form a crosslinked coating on the metal substrate, and
- d) forming the metal substrate into a food or beverage can or a portion thereof.
2 more elements
Dependencies are inferred from the claim text.