Can with bisphenol A capture system

• US 8,337,967 B2
• Filed: 09/22/2010
• Issued: 12/25/2012
• Est. Priority Date: 09/22/2010
• Status: Expired due to Fees

• Current Assignee: Empire Technology Development LLC (Allied Inventors Management, LLC)
• Original Assignee: Empire Technology Development LLC (Allied Inventors Management, LLC)
• Inventors: Kusuura, Takahisa, Ozawa, Fujiko
• Primary Examiner(s): THOMPSON, CAMIE S
• Application Number:
  US13/201,607
• Publication Number:
  US 20120067763A1
• Time in Patent Office: 825 Days
• Field of Search: None
• US Class Current: 428/34.1
• CPC Class Codes: B21D 51/26 cans or tins; Closing same in a permanent manner making outlet arrangements B21D51/38; welding or soldering B23K
• CPC Class Codes: B32B 1/00 Layered products having a non-planar shape
• CPC Class Codes: B32B 15/14 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 15/18 comprising iron or steel B32B15/011, B32B15/012 and B32B15/013 take precedence
• CPC Class Codes: B32B 15/20 comprising aluminium or copper B32B15/016 and B32B15/017 take precedence
• CPC Class Codes: B32B 2250/02 2 layers
• CPC Class Codes: B32B 2255/06 on metal layer
• CPC Class Codes: B32B 2255/26 Polymeric coating
• CPC Class Codes: B32B 2307/73 Hydrophobic
• CPC Class Codes: B32B 2439/66 Cans, tins
• CPC Class Codes: B32B 2439/70 Food packaging
• CPC Class Codes: B32B 33/00 Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
• CPC Class Codes: B32B 5/022 Non-woven fabric
• CPC Class Codes: B65B 29/00 Packaging of materials presenting special problems
• CPC Class Codes: B65D 25/14 Linings or internal coatings of containers made by folding or erecting blanks made of paper B65D5/56 ; linings for domestic water storage heaters F24H1/183
• CPC Class Codes: C09D 163/00 Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
• CPC Class Codes: C09D 5/086 Organic or non-macromolecular compounds
• CPC Class Codes: Y10T 156/1048 to form dished or receptacle-like product
• CPC Class Codes: Y10T 428/13 Hollow or container type article [e.g., tube, vase, etc.]

Abstract

The present technology provides a bisphenol A capture system for food and beverage containers which include BPA-containing coatings. The capture system is made of one or more materials which bind any BPA eluting from the BPA-containing coating. The present capture system therefore reduces or prevents BPA from migrating from the can coating into the food or beverages stored in the can. The present technology further provides methods of manufacturing and using such coatings.

Claims

1. A metal can comprising:

an interior surface, wherein at least a portion of the interior surface is covered with one or more of a first coating comprising bisphenol A, and

a second coating comprising an electrospun bisphenol A binding material, wherein the first coating is in contact with the interior surface and the second coating is at least partially layered over the first coating.

2. The metal can of claim 1 wherein the metal is selected from the group consisting of iron, aluminum, tin, steel, an alloy of any one thereof, and a combination of any two or more thereof.

3. The metal can of claim 1 wherein the first coating is an epoxy resin or polycarbonate resin.

4. The metal can of claim 1 wherein the second coating is configured to bind substantially all the bisphenol A leaching from the first coating.

5. The metal can of claim 1 wherein the electrospun material of the second coating naturally binds bisphenol A.

6. The metal can of claim 5 wherein the material is selected from chitin, chitosan, dextrin, fibroin, keratin and mixtures of any two or more thereof.

7. The metal can of claim 1 wherein the binding material of the second coating has been adapted to binding bisphenol A by molecular imprinting using a bisphenol A compound.

8. The metal can of claim 7 wherein the material of the second coating is selected from the group consisting of cellulose, cellulose acetate, cellulose acetate butylate, lignocellulose, polyamine, N-alkyl acrylamide, N-vinyl pyrrolidone and a mixture of any two or more thereof.

9. A metal can comprising:

an interior surface wherein at least a portion of the interior surface is coated with a coating comprising bisphenol A and an electrospun material that binds bisphenol A.

10. The metal can of claim 9 wherein the coating comprises an epoxy resin or polycarbonate resin.

11. The metal can of claim 9 wherein the electrospun material binds substantially all of the bisphenol A in the coating.

12. The metal can of claim 9 wherein the electrospun material naturally binds bisphenol A.

13. The metal can of claim 12 wherein the electrospun material is selected from chitin, chitosan, dextrin, fibroin, keratin and mixtures of any two or more thereof.

14. The metal can of claim 9 wherein the electrospun material has been adapted to binding bisphenol A by molecular imprinting using bisphenol A or a bisphenol A analog.

15. The metal can of claim 14 wherein the electrospun material is selected from the group consisting of cellulose, cellulose acetate, cellulose acetate butylate, lignocellulose, polyamine, N-alkyl acrylamide, N-vinyl pyrrolidone and a mixture of any two or more thereof.

16. A method of manufacturing comprising:

layering an electrospun bisphenol A-binding material onto a coating comprising bisphenol A, wherein the coating covers at least a portion of a metal substrate.

17. The method of claim 16 wherein the metal substrate is a metal can and the coating comprising bisphenol A is on an interior surface of the can.

18. The method of claim 16 wherein the metal substrate is selected from the group consisting of iron, aluminum, tin, steel, an alloy of any one thereof, and a combination of any two or more thereof.

19. The method of claim 16 wherein the BPA-binding material is selected from chitin, chitosan, dextrin, fibroin, keratin and mixtures of any two or more thereof.

20. The method of claim 16 wherein the material of the second coating is selected from the group consisting of cellulose, cellulose acetate, cellulose acetate butylate, lignocellulose, polyamine, N-alkyl acrylamide, N-vinyl pyrrolidone and a mixture of any two or more thereof.