Coating Compositions for Aluminum Beverage Cans and Methods of Coating Same

Patent metadata

Field	Value
Publication number	US-2016137348-A1
Application number	US-201514918258-A
Country	US
Kind code	A1
Filing date	Oct 20, 2015
Priority date	Oct 20, 2004
Publication date	May 19, 2016
Grant date	—

Abstract

A coating composition for a food or beverage can that includes an emulsion polymerized latex polymer formed by combining an ethylenically unsaturated monomer component with an aqueous dispersion of a water-dispersible polymer.

First claim

What is claimed is:

1 - 20 . (canceled)

21 . An inside spray beverage can coating composition, comprising:
an emulsion polymerized latex polymer that is prepared from ingredients including:
a salt of an acid- or anhydride-functional acrylic polymer and an amine;
an ethylenically unsaturated monomer component that includes a vinyl aromatic compound and an oxirane-group containing monomer; and
water;
wherein the coating composition is substantially free of bound bisphenol A, and wherein the coating composition is suitable for forming an inside spray coating of a two-piece drawn and ironed aluminum beverage can.

22 . The coating composition of claim 21 , wherein the acid- or anhydride-functional acrylic polymer comprises an organic-solution polymerized acid- or anhydride-functional acrylic polymer.

23 . The coating composition of claim 22 , wherein the polymerizable unsaturated monomers used to generate the organic-solution polymerized acid- or anhydride-functional acrylic polymer include methacrylic acid, styrene, and ethyl acrylate.

24 . The coating composition of claim 21 , wherein the oxirane-group containing monomer is present in an amount of 0.1 wt-% to 30 wt-%, based on the weight of the ethylenically unsaturated monomer component.

25 . The coating composition of claim 22 , wherein the oxirane-group containing monomer is present in an amount of more than 5 wt-% to 30 wt-%, based on the weight of the ethylenically unsaturated monomer component.

26 . The coating composition of claim 21 , wherein the oxirane-group containing monomer is present in an amount of more than 5 wt-% to 9 wt-%, based on the weight of the ethylenically unsaturated monomer component.

27 . The coating composition of claim 21 , wherein the oxirane group-containing monomer comprises glycidyl methacrylate, glycidyl acrylate, or a mixture of glycidyl methacrylate and glycidyl acrylate.

28 . The coating composition of claim 22 , wherein the oxirane group-containing monomer comprises glycidyl methacrylate.

29 . The coating composition of claim 21 , wherein the ethylenically unsaturated monomer component comprises a vinyl aromatic component that is at least 20 wt-% of the ethylenically unsaturated monomer component, and wherein the vinyl aromatic component comprises one or more aromatic compounds.

30 . The coating composition of claim 21 , wherein the vinyl aromatic compound is styrene.

31 . The coating composition of claim 21 , wherein the ethylenically unsaturated monomer component comprises at least 20 wt-% of styrene.

32 . The coating composition of claim 21 , wherein the ethylenically unsaturated monomer component includes ethyl acrylate.

33 . The coating composition of claim 21 , wherein the ethylenically unsaturated monomer component includes ethyl acrylate, styrene, and glycidyl methacrylate.

34 . The coating composition of claim 21 , wherein the ethylenically unsaturated monomer component includes butyl acrylate, styrene, and glycidyl methacrylate.

35 . The coating composition of claim 21 , wherein the coating composition includes a crosslinker.

36 . The coating composition of claim 35 , wherein the crosslinker comprises a phenoplast crosslinker.

37 . The coating composition of claim 21 , wherein the coating composition is made without using PVC compounds.

38 . The coating composition of claim 21 , wherein the emulsion polymerized latex polymer is substantially free of bound aromatic glycidyl ether compounds.

39 . The coating composition of claim 22 , wherein the coating composition is substantially free of bound aromatic glycidyl ether compounds.

40 . The coating composition of claim 21 , wherein the ethylenically unsaturated monomer component does not include acrylamide, methacrylamide, N-isobutoxymethyl acrylamide, or N-butoxymethyl acrylamide.

41 . The coating composition of claim 21 , wherein the ethylenically unsaturated monomer component does not include any vinyl acrylamide monomers.

42 . The coating composition of claim 21 , wherein at least 25 wt-% of the ethylenically unsaturated monomer component is used in making the latex polymer, based on the total weight of ethylenically unsaturated monomer component and salt of the acid- or anhydride-functional acrylic polymer.

43 . The coating composition of claim 22 , wherein at least 50 wt-% of the ethylenically unsaturated monomer component is used in making the latex polymer, based on the total weight of ethylenically unsaturated monomer component and salt of the organic-solution polymerized acid- or anhydride-functional acrylic polymer.

44 . The coating composition of claim 27 , wherein at least 60 wt-% of the ethylenically unsaturated monomer component is used in making the latex polymer, based on the total weight of ethylenically unsaturated monomer component and salt of the acid- or anhydride-functional acrylic polymer.

45 . The coating composition of claim 21 , wherein the acid- or anhydride-functional acrylic polymer has a number average molecular weight of 1,500 to 50,000.

46 . The coating composition of claim 21 , wherein the acid- or anhydride-functional acrylic polymer has a number average molecular weight of 2,000 to 20,000.

47 . The coating composition of claim 21 , wherein the acid- or anhydride-functional acrylic polymer has an acid number of at least 40.

48 . The coating composition of claim 22 , wherein the organic-solution polymerized acid- or anhydride-functional acrylic polymer has an acid number of at least 40.

49 . The coating composition of claim 22 , wherein the organic-solution polymerized acid- or anhydride-functional acrylic polymer has an acid number of at least 100.

50 . The coating composition of claim 44 , wherein the acid- or anhydride-functional acrylic polymer has an acid number of at least 100.

51 . The coating composition of claim 21 , wherein the acid- or anhydride-functional acrylic polymer comprises more than 15 wt-% acid- or anhydride-functional monomers, based on the weight of polymerizable unsaturated monomer used to generate the acid- or anhydride-functional acrylic polymer.

52 . The coating composition of claim 22 , wherein the acid- or anhydride-functional acrylic polymer comprises more than 30 wt-% acid- or anhydride-functional monomers, based on the weight of polymerizable unsaturated monomer used to generate the organic-solution polymerized acid- or anhydride-functional acrylic polymer.

53 . The coating composition of claim 51 , wherein the polymerizable unsaturated monomers used to generate the acid- or anhydride-functional acrylic polymer includes methacrylic acid and does not include acrylic acid.

54 . The coating composition of claim 22 , wherein the acid- or anhydride-functional monomers included in the polymerizable unsaturated monomers used to generate the organic-solution polymerized acid- or anhydride-functional acrylic polymer consists of methacrylic acid.

55 . The coating composition of claim 21 , wherein the amine comprises a tertiary amine.

56 . The coating composition of claim 55 , wherein the tertiary amine comprises triethyl amine or dimethyl ethanol amine.

57 . The coating composition of claim

Assignees

• Valspar Sourcing Inc

Inventors

• O'Brien Robert M
• Rardon Daniel E
• Spynda Rachael Ann
• Bartley George K
• Evans Richard H

Classifications

• Y10T428/31688

  Next to aldehyde or ketone condensation product · CPC title

• Y10T428/31696

  Including polyene monomers [e.g., butadiene, etc.] · CPC title

• C09D133/14

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

• C08F265/10

  on to polymers of amides or imides · CPC title

• B32B15/04

  comprising metal as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a bituminous or tarry layer B32B11/08; next to a water-setting substance layer B32B13/06; next to a glass layer B32B17/061; next to a cellulosic plastic layer B32B23/042)} · CPC title