COATING COMPOSITIONS FOR CONTAINERS

• US 20120301646A1
• Filed: 05/23/2011
• Published: 11/29/2012
• Est. Priority Date: 05/23/2011
• Status: Abandoned Application

• Current Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Inventors: List, Michael, Moussa, Youssef, Knotts, Claudia
• Application Number:
  US13/113,127
• Publication Number:
  US 20120301646A1
• Time in Patent Office: Days
• US Class Current: 428/35.7
• CPC Class Codes: B65D 1/165 Cylindrical cans
• CPC Class Codes: B65D 23/02 Linings or internal coatings
• CPC Class Codes: B65D 23/0814 characterised by the composition of the material
• CPC Class Codes: C08G 59/1422 containing phosphorus
• CPC Class Codes: C08G 59/304 containing phosphorus
• CPC Class Codes: C08L 63/00 Compositions of epoxy resins; Compositions of derivatives of epoxy resins
• CPC Class Codes: C08L 71/00 Compositions of polyethers obtained by reactions forming an ether link in the main chain of polyacetals C08L59/00; of epoxy resins C08L63/00; of polythioether-ethers C08L81/02; of polyether-sulfones C08L81/06; Compositions of derivatives of such polymers
• CPC Class Codes: C09D 133/02 Homopolymers or copolymers of acids; Metal or ammonium salts thereof
• CPC Class Codes: C09D 171/00 Coating compositions based on polyethers obtained by reactions forming an ether link in the main chain based on polyacetals C09D159/00; based on epoxy resins C09D163/00; based on polythioether-ethers C09D181/02; based on polyethersulfones C09D181/06; Coating compositions based on derivatives of such polymers
• CPC Class Codes: Y10T 428/1352 Polymer or resin containing [i.e., natural or synthetic]

Abstract

A coating composition comprising a polyether polyol having a hydroxyl functionality of 3 to 8 and the reaction product of:

(i) a phosphorus acid, and

(ii) a polyepoxide and/or a polyester.

The compositions are useful for coating containers of all sorts, such as food and beverage containers. The compositions can be formulated to be substantially free of bisphenol A (BPA), bisphenol A diglycidyl ether (BADGE) and other derivatives of BPA.

Claims

1. A coating composition comprising:

(a) a polyether polyol having a hydroxyl functionality of 3 to 8, and

(b) a reaction product comprising;

(i) a phosphorus acid, and

(ii) a polyepoxide and/or a polyester polyol.

2. The coating composition of claim 1 in which the polyether polyol has a hydroxyl functionality of 6 to 8.

3. The coating composition of claim 1 in which the polyester polyol comprises a reaction product comprising a saccharide with an alkylene oxide.

4. The coating composition of claim 3 in which the saccharide comprises sucrose.

5. The coating composition of claim 3 in which the alkylene oxide comprises ethylene oxide, propylene oxide, and/or butylene oxide.

6. The coating composition of claim 1 in which the polyether polyol has the hydroxyl number of 150 to 600.

7. The coating composition of claim 1 in which the phosphorus acid is phosphoric acid.

8. The coating composition of claim 1 in which the polyepoxide is a diglycidyl ether of a diol.

9. The coating composition of claim 1 which is substantially free of bisphenol A and derivatives of bisphenol A.

10. The coating composition of claim 1 which is completely free of bisphenol A and derivatives of bisphenol A.

11. The coating composition of claim 9 in which the polyepoxide comprises a diglycidyl ether of an aliphatic and/or cycloaliphatic diol.

12. The coating composition of claim 11 wherein the diol comprises cyclohexane dimethanol.

13. The coating composition of claim 11 in which the polyester polyol has an Mn of 2000 to 10,000, a hydroxyl number of 20 to 75, and an acid value of 15 to 25.

14. The coating composition of claim 1 in which the phosphorus acid is used in amounts of 0.2 to 0.5 equivalents per equivalent of epoxy in the epoxy resin or per equivalent of hydroxyl in the polyester polyol.

15. The coating composition of claim 1 in which the polyether polyol is present in amounts of 2 to 50 percent by weight based on weight of resin solids in the coating composition.

16. The coating composition of claim 1 in which (b) is present in an amount of up to 10 percent by weight based on weight of resin solids.

17. The coating composition of claim 1 further comprising a polyol comprising an acrylic polymer and/or a polyester polymer.

18. The coating composition of claim 1 further comprising a crosslinking agent.

19. The coating composition of claim 18 in which the crosslinking agent comprises an aminoplast and/or a phenolplast.

20. The coating composition of claim 17 in which the polyol is present in amounts of 10 to 90 percent by weight based on weight of resin solids.

21. The coating composition of claim 18 in which the crosslinking agent is present in amounts of 5 to 50 percent by weight based on weight of resin solids in the coating composition.

22. A coated article comprising:

(a) a substrate, and

(b) deposited on at least a portion of the substrate the coating composition of claim 1.

23. The coated article of claim 22 in which the substrate is a container.

24. The coated article of claim 23 in which the container is for food or beverage.

25. The coated article of claim 24 in which the substrate is a can.

26. The coated article of claim 25 in which the coating is deposited on the exterior walls of the can.

27. The coating composition of claim 1 which is substantially free of bisphenol A and derivatives thereof.

28. The coating composition of claim 1 which is free of bisphenol A and derivatives thereof.