Bisphenol A and aromatic glycidyl ether-free coatings

Patent metadata

Field	Value
Publication number	US-10625301-B2
Application number	US-201815979889-A
Country	US
Kind code	B2
Filing date	May 15, 2018
Priority date	Aug 11, 2005
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

Disclosed are Bisphenol A (BPA), Bisphenol F, Bisphenol A diglycidyl ether (BADGE), and Bisphenol F diglycidyl ether (BFDGE)-free coating compositions for metal substrates including an under-coat composition containing a polyester (co)polymer, and an under-coat cross-linker; and an over-coat composition containing a poly(vinyl chloride) (co)polymer dispersed in a substantially nonaqueous carrier liquid, an over-coat cross-linker, and a functional (meth)acrylic (co)polymer. Also provided is a method of coating a metal substrate using the BPA, BPF, BADGE and BFDGE-free coating system to produce a hardened protective coating useful in fabricating metal storage containers. The coated substrate is particularly useful in fabricating multi-part foodstuffs storage containers with “easy-open” end closures.

First claim

What is claimed is:

1. A hardenable packaging coating composition that is completely free of BPA, BPF, BADGE, and BFDGE, the composition comprising:
an under-coat composition comprising:
a polyester (co)polymer present in the under-coat composition in an amount of from about 20 to about 99 percent, by weight on a non-volatile solids basis; and
an under-coat cross-linker; and

an over-coat composition comprising:
a substantially nonaqueous carrier liquid;
a poly(vinyl chloride) (co)polymer dispersed in the substantially nonaqueous carrier liquid;
an additional (co)polymer component; and
an over-coat cross-linker.

2. The hardenable packaging coating composition of claim 1 , wherein the additional (co)polymer component comprises a solution vinyl (PVC) (co)polymer, a solution poly(vinyl)butyral (co)polymer, a dispersed or solution meth(acrylic) copolymer, a solution polyester (co)polymer, or a mixture thereof.

3. The hardenable packaging coating composition of claim 1 , wherein the over-coat composition comprises from about 40 to about 90 percent by weight, on a non-volatile solids basis, of the poly(vinyl chloride) (co)polymer.

4. The hardenable packaging coating composition of claim 1 , wherein the under-coat cross-linker comprises a resole phenolic cross-linker.

5. The hardenable packaging coating composition of claim 1 , wherein the polyester (co)polymer comprises Dynapol L 952™ polyester (co)polymer.

6. The hardenable packaging coating composition of claim 1 , wherein the composition includes a lubricant.

7. The hardenable packaging coating composition of claim 1 , wherein the coating composition is an interior easy open can end closure coating composition.

8. An easy open end metal food closure having an interior coating formed form the coating composition of claim 1 .

9. The hardenable packaging coating composition of claim 1 , wherein the additional (co)polymer component comprises a solution polyester (co)polymer.

10. The hardenable packaging coating composition of claim 9 , wherein the polyester (co)polymer has a glass transition temperature (Tg) of at least 50° C.

11. The hardenable packaging coating composition of claim 9 , wherein the polyester (co)polymer of the under-coat composition comprises Dynapol L 952™ polyester (co)polymer.

12. The hardenable packaging coating composition of claim 9 , wherein the over-coat composition includes a lubricant that comprises a long-chain aliphatic wax, a carnuba wax, a synthetic wax dispersion, a poly(tetrafluoroethylene) wax, or a mixture, blend or dispersion thereof.

13. The hardenable packaging coating composition of claim 1 , wherein the under-coat composition, on a non-volatile basis, includes from about 5 to about 30 percent by weight of under-coat cross-linker.

14. The hardenable packaging coating composition of claim 13 , wherein the under-coat cross-linker comprises a phenolic cross-linker.

15. The hardenable packaging coating composition of claim 1 , wherein the polyester (co)polymer has a glass transition temperature (Tg) of at least 60° C.

16. The hardenable packaging coating composition of claim 15 , wherein the under-coat composition includes about 60 to about 90 percent, by weight on a non-volatile solids basis, of the polyester (co)polymer.

17. A hardenable packaging coating composition that is completely free of BPA, BPF, BADGE, and BFDGE, the composition comprising:
an under-coat composition comprising:
a polyester (co)polymer having a glass transition temperature of at least 60° C. that is present in the under-coat composition in an amount of from about 20 to about 99 percent, by weight on a non-volatile solids basis; and
a phenolic cross-linker; and

an over-coat composition comprising:
a substantially nonaqueous carrier liquid;
poly(vinyl chloride) (co)polymer particles dispersed in the substantially nonaqueous carrier liquid;
a solution polyester (co)polymer; and
an over-coat cross-linker.

18. The hardenable packaging coating composition of claim 17 , wherein the coating composition is an interior easy open can end closure coating composition.

19. An easy open end metal food closure having an interior coating formed from the coating composition of claim 17 .

20. The coating composition of claim 17 , wherein the under-coat composition includes a substantially nonaqueous carrier liquid.

21. The hardenable packaging coating composition of claim 20 , wherein the polyester (co)polymer of the under-coat composition comprises Dynapol L 952™ polyester (co)polymer.

Assignees

• Swimc Llc

Inventors

• Mayr Peter
• Cooke Paul
• Fielding Trevor
• Goodwin Ronald L
• Paulson Greg
• Robinson James
• Violleau Anthony

Classifications

• C09D167/00

  Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain (based on polyester-amides C09D177/12; based on polyester-imides C09D179/08); Coating compositions based on derivatives of such polymers · CPC title

• B05D7/5483 Primary

  No curing step for any layer · CPC title

• C09D5/106

  containing Zn · CPC title

• Y10T428/31797

  Next to addition polymer from unsaturated monomers · CPC title

• Y10T428/31794

  Of cross-linked polyester · CPC title