Packaging coated with an emulsion polymerized latex polymer

Patent metadata

Field	Value
Publication number	US-11091656-B2
Application number	US-201615577941-A
Country	US
Kind code	B2
Filing date	May 26, 2016
Priority date	May 29, 2015
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

A package with a coating composition deposited on at least a portion thereof is disclosed. The coating composition comprises: (a) a latex polymer comprising the emulsion polymerization product of (i) an emulsion monomer component comprising at least one ethylenically unsaturated monomer polymerized in the presence of (ii) a surfactant that is polymerizable with the at least one ethylenically unsaturated monomer. Also disclosed is a method for applying the coating composition to the package.

First claim

The invention claimed is:

1. A package with a coating composition deposited on at least a portion thereof wherein the coating composition comprises:
(a) a latex polymer comprising the emulsion polymerization product of
(i) an emulsion monomer component comprising at least one ethylenically unsaturated monomer polymerized in the presence of
(ii) a surfactant that is polymerizable with the at least one ethylenically unsaturated monomer;

(b) a curing agent, wherein the curing agent comprises a hydroxyalkylamide and/or a hydroxyalkylurea; and
(c) a phosphorus acid.

2. The package of claim 1 in which the polymerizable surfactant is polymeric.

3. The package of claim 1 in which the polymerizable surfactant contains a polymerizable group comprising vinyl, allyl, (meth)acryl and/or alkenyl.

4. The package of claim 1 in which the polymerizable surfactant comprises a hydrophobic group and a hydrophilic group.

5. The package of claim 4 in which the hydrophobic group comprises C 8 -C 50 alkyl.

6. The package of claim 4 in which the hydrophilic group comprises an ionic salt group or a poly(oxyethylene) group.

7. The package of claim 1 in which the polymerizable surfactant is non-ionic, ionic, or anionic.

8. The package of claim 1 in which the polymerizable surfactant is nonionic and is present in combination with an anionic surfactant.

9. The package of claim 7 in which the polymerizable surfactant is anionic and the anionic group comprises sulfonate, phosphonate and/or carboxylate.

10. The package of claim 1 in which the polymerizable surfactant comprises the structure:

where R 1 is independently H, C 1 to C 30 alkyl group

where R 4 is C 1 to C 30 alkyl,
A is

Ar is a divalent aromatic group,
m is 0 to 1,
R 2 is H, an alkyl group containing at least 8 carbon atoms,
n is 0 to 30,
p is 0 to 1,
q is 2 to 250,
R 3 is C 2 H 4 —, including mixtures with —C 3 H 7 —, and
X is an ionic salt group or an alkyl group.

11. The package of claim 10 where
a) R 1 is independently H or CH 3 ,
A is —CH 2 —O—CH 2 —,

m is 1,
R 2 is an alkyl group containing at least 8 carbon atoms,
n is 1,
p is 1,
R 3 is —C 2 H 4 —,
q is 2 to 30, and
X is sulfonate or phosphonate.

12. The package of claim 1 in which the emulsion monomer component comprises a mixture of polymerizable ethylenically unsaturated monomers.

13. The package of claim 1 in which the emulsion monomer component comprises ethylenically unsaturated monomers selected from alkyl (meth)acrylates, hydroxyalkyl (meth)acrylates and epoxy group-containing ethylenically unsaturated monomers and combinations thereof.

14. The package of claim 1 in which the ethylenically unsaturated monomers are free of styrene and/or epoxy group-containing ethylenically unsaturated monomers.

15. The package of claim 1 in which the coating composition is substantially free of bisphenol A and bisphenol A diglycidyl ether (BADGE).

16. The package of claim 1 in which the coating composition does not release formaldehyde upon curing.

17. The package of claim 1 in which the coating composition further comprises
(d) a polar polyolefin.

18. The package of claim 17 in which
the polar polyolefin comprises a polyethylene (meth)acrylic acid copolymer and is present in the composition in amounts of 5 to 50 percent by weight based on resin solids weight of the coating composition.

19. The package of claim 1 which is a metal can.

20. The package of claim 1 in which the coating composition is applied as a top coat over a basecoat of the same or different composition.

21. A method comprising:
(a) applying the coating composition of claim 1 to a substrate prior to or after forming the substrate into a package; and
(b) heating the coated substrate to a temperature and for a time sufficient to cure the coating composition.

22. The method of claim 21 wherein the package is a metal can.

23. The package of claim 10 where
b) R 1 is independently H or CH 3 ,
A is

where R 4 is an alkyl group having at least 8 carbon atoms,
m is 1,
n is 0,
p is 1,
R 3 is —C 2 H 4 —,
q is 2 to 40, and
X is sulfonate or phosphonate.

24. The package of claim 10 where
c) R 1 is independently H or CH 3 ,
A is —CH 2 —O—,
m is 1,
R 2 is an alkyl group having at least 8 carbon atoms,
n is 1,
p is 1,
R 4 is —C 2 H 4 —,
q is 2 to 40, and
X is sulfonate or phosphonate.

25. The package of claim 10 where
d) R 1 is independently H or C 1 to C 30 alkyl,
m is 0,
R 2 is H,
n is 6 to 10,
p is 1,
q is 5 to 40,
R 3 is —C 2 H 4 —, and
X is C 1 to C 4 alkyl.

26. The package of claim 1 , in which the phosphorus acid is phosphoric acid.

27. The package of claim 26 , wherein the phosphoric acid comprises 0.1 to 1.0 percent by weight based on total resin solids of the coating composition.

Assignees

• Ppg Ind Ohio Inc

Inventors

• Singer Debra L
• Duhamel Dary
• Lock Kam Lun
• Li Qin
• Bao Hanzhen
• Dudik John M
• Millero Jr Edward R
• Retsch Jr William H

Classifications

• C09D133/14 Primary

  of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen · CPC title

• C09D133/12

  Homopolymers or copolymers of methyl methacrylate · CPC title

• C09D133/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• C09D133/06

  of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical · CPC title

• C09D133/00 Primary

  Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers · CPC title