Container coating system
First Claim
1. A multi-coat coating system comprising an undercoat composition and an overcoat composition, wherein the undercoat comprises a polymer having at least two aryl or heteroaryl groups in which each aryl or heteroaryl group includes a ring, an oxygen atom attached to the ring and a substituent group attached to the ring at an ortho or meta position relative to the oxygen atom;
- wherein the overcoat comprises;
at least one thermoplastic material;
ora polyester polymer; and
wherein the coating system is substantially free of diphenols having estrogenic activity greater than or equal to that of bisphenol S,wherein the undercoat polymer has one or more segments of the below Formula I;
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Accused Products
Abstract
A multi-coat coating system having an undercoat composition and an overcoat composition, wherein the undercoat, overcoat or both the undercoat and overcoat contain a polymer having segments of a specified formula and are substantially free of polyhydric phenols having estrogenic activity greater than or equal to that of bisphenol S. The coating system is suitable for use on a food-contact surface of food or beverage containers.
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Citations
20 Claims
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1. A multi-coat coating system comprising an undercoat composition and an overcoat composition, wherein the undercoat comprises a polymer having at least two aryl or heteroaryl groups in which each aryl or heteroaryl group includes a ring, an oxygen atom attached to the ring and a substituent group attached to the ring at an ortho or meta position relative to the oxygen atom;
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wherein the overcoat comprises; at least one thermoplastic material;
ora polyester polymer; and wherein the coating system is substantially free of diphenols having estrogenic activity greater than or equal to that of bisphenol S, wherein the undercoat polymer has one or more segments of the below Formula I; - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An article, comprising a container, or a portion thereof, comprising a metal substrate and a multi-coat coating system applied on at least a portion of the metal substrate comprising an undercoat composition and an overcoat composition, wherein the undercoat comprises a polymer having at least two aryl or heteroaryl groups in which each aryl or heteroaryl group includes a ring, an oxygen atom attached to the ring and a substituent group attached to the ring at an ortho or meta position relative to the oxygen atom;
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wherein the overcoat comprises; at least one thermoplastic material;
ora polyester polymer; and wherein the coating system is substantially free of diphenols having estrogenic activity greater than or equal to that of bisphenol S, wherein the undercoat polymer has one or more segments of the below Formula I;
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20. A method comprising:
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applying an undercoat composition on at least a portion of a metal substrate prior to or after forming the metal substrate into a container, drying or at least partially curing the undercoat composition, and applying and curing an overcoat composition to produce a cured multi-coat coating adhered to the metal substrate, wherein the undercoat comprises a polymer having at least two aryl or heteroaryl groups in which each aryl or heteroaryl group includes a ring, an oxygen atom attached to the ring and a substituent group attached to the ring at an ortho or meta position relative to the oxygen atom; wherein the overcoat comprises; at least one thermoplastic material;
ora polyester polymer; and wherein the coating system is substantially free of diphenols having estrogenic activity greater than or equal to that of bisphenol S, wherein the undercoat polymer has one or more segments of the below Formula I;
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Specification