Can with bisphenol A capture system

• US 9,221,583 B2
• Filed: 11/21/2012
• Issued: 12/29/2015
• 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: Ozawa, Fujiko, Kusuura, Takahisa
• Primary Examiner(s): Chriss, Jennifer
• Assistant Examiner(s): Thompson, Camie
• Application Number:
  US13/683,894
• Publication Number:
  US 20130081357A1
• Time in Patent Office: 1,133 Days
• Field of Search: 428/38.5
• US Class Current: 1/1
• 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 coated with a single electrospun coating comprising both a bisphenol A containing polymer and a bisphenol A binding material;

wherein the bisphenol A binding material binds substantially all of the bisphenol A leaching from the bisphenol A containing polymer; and

wherein the ratio of the bisphenol A binding material to the bisphenol A containing polymer is from 20 weight percent to 70 weight percent.

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 bisphenol A binding material naturally binds bisphenol A.

4. The metal can of claim 3, wherein the bisphenol A binding material is selected from chitin, chitosan, dextrin, fibroin, keratin or mixtures of any two or more thereof.

5. The metal can of claim 1, wherein the bisphenol A binding material has been adapted to binding bisphenol A by molecular imprinting using a bisphenol A compound or a bisphenol A analog.

6. The metal can of claim 5, wherein the bisphenol A binding material is selected from the group consisting of cellulose, cellulose acetate, cellulose acetate butyrate, lignocellulose, polyamine, N-alkyl acrylamide, N-vinyl pyrrolidone and a mixture of any two or more thereof.

7. The metal can of claim 1, wherein the coating comprises an epoxy resin or polycarbonate resin.

8. The metal can of claim 1, wherein the ratio of the bisphenol A binding material to the bisphenol A containing polymer is from 30 weight percent to 70 weight percent.

9. The metal can of claim 1, wherein the ratio of the bisphenol A binding material to the bisphenol A containing polymer is from 40 weight percent to 70 weight percent.

10. A method of manufacturing comprising:

forming a single electrospun coating comprising both a bisphenol A containing polymer and a bisphenol A binding material on a metal substrate;

wherein the ratio of the bisphenol A binding material to the bisphenol A containing polymer is from 20 weight percent to 70 weight percent.

11. The method of claim 10, wherein the metal substrate is a metal sheet.

12. The method of claim 11, further comprising:

forming a can from the metal sheet such that the coating comprises an interior surface of the can;

wherein the can forming may occur before or after the formation of the electrospun coating.

13. The method of claim 10, wherein the coating comprises an epoxy resin or polycarbonate resin.

14. The method of claim 10, wherein the bisphenol A binding material is selected from chitin, chitosan, dextrin, fibroin, keratin or mixtures of any two or more thereof.

15. The method of claim 10, wherein the bisphenol A binding material is selected from the group consisting of cellulose, cellulose acetate, cellulose acetate butyrate, lignocellulose, polyamine, N-alkyl acrylamide, N-vinyl pyrrolidone and a mixture of any two or more thereof.

16. The method of claim 10, wherein the ratio of the bisphenol A binding material to the bisphenol A containing polymer is from 30 weight percent to 70 weight percent.

17. A method comprising:

filling a can in whole or in part with a food or a beverage,

wherein the can comprises an interior surface coated with a single electrospun coating comprising both a bisphenol A containing polymer and a bisphenol A binding material;

wherein the ratio of the bisphenol A binding material to the bisphenol A containing polymer is from 20 weight percent to 70 weight percent.