IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
|
| 국제특허분류(IPC7판) |
|
| 출원번호 |
UP-0253161
(2005-10-18)
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| 등록번호 |
US-7592047
(2009-10-20)
|
|
발명자
/ 주소 |
- O'Brien, Robert M.
- Rardon, Daniel E.
- Spynda, Rachael Ann
- Bartley, III, George K.
- Evans, Richard H.
|
| 출원인 / 주소 |
|
| 인용정보 |
피인용 횟수 :
20 인용 특허 :
118 |
초록
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 salt of an acid-or anhydride-functional polymer and an amine, preferably, a tertiary amine.
대표청구항
▼
What is claimed is: 1. A method of coating a food or beverage can, the method comprising: forming a composition comprising an emulsion polymerized latex polymer, comprising: forming a salt of an acid-or anhydride-functional polymer and an amine in a carrier comprising water to form an aqueous dispe
What is claimed is: 1. A method of coating a food or beverage can, the method comprising: forming a composition comprising an emulsion polymerized latex polymer, comprising: forming a salt of an acid-or anhydride-functional polymer and an amine in a carrier comprising water to form an aqueous dispersion; combining an ethylenically unsaturated monomer component with the aqueous dispersion; and polymerizing the ethylenically unsaturated monomer component in the presence of the aqueous dispersion to form an emulsion polymerized latex polymer that is substantially free of bound bisphenol A and aromatic glycidyl ether compounds; and applying the composition comprising the emulsion polymerized latex polymer to a metal substrate prior to or after forming the metal substrate into a food or beverage can or portion thereof. 2. The method of claim 1 wherein applying the composition to a metal substrate comprises applying the composition to the metal substrate in the form of a planar coil or sheet, hardening the emulsion polymerized latex polymer, and forming the substrate into a food or beverage can or portion thereof. 3. The method of claim 2 wherein forming the substrate into a can or portion thereof comprises forming the substrate into a can end or a can body. 4. The method of claim 2 wherein the can is a 2-piece drawn food can, 3-piece food can, food can end, drawn and ironed can, or beverage can end. 5. The method of claim 1 wherein the metal substrate comprises steel or aluminum. 6. The method of claim 1 wherein applying the composition to a metal substrate comprises applying the composition to the metal substrate after the metal substrate is formed into a can or portion thereof. 7. The method of claim 1 wherein combining an ethylenically unsaturated monomer component with the aqueous dispersion comprises adding the ethylenically unsaturated monomer component to the aqueous dispersion. 8. The method of claim 7 wherein the ethylenically unsaturated monomer component is added incrementally to the aqueous dispersion. 9. The method of claim 1 wherein the ethylenically unsaturated monomer component comprises a mixture of monomers. 10. The method of claim 9 wherein the mixture of monomers comprises at least one oxirane functional group-containing monomer. 11. The method of claim 10 wherein the mixture of monomers comprises at least one oxirane functional group-containing alpha, beta-ethylenically unsaturated monomer. 12. The method of claim 10 wherein the oxirane functional group-containing monomer is present in the ethylenically unsaturated monomer component in an amount of at least 0.1 wt-%, based on the weight of the monomer mixture. 13. The method of claim 10 wherein the oxirane functional group-containing monomer is present in the ethylenically unsaturated monomer component in an amount of no greater than 30 wt-%, based on the weight of the monomer mixture. 14. The method of claim 1 further comprising combining the emulsion polymerized latex polymer with one or more crosslinkers, fillers, catalysts, dyes, pigments, toners, extenders, lubricants, anticorrosion agents, flow control agents, thixotropic agents, dispersing agents, antioxidants, adhesion promoters, light stabilizers, organic solvents, surfactants, or combinations thereof in the coating composition. 15. The method of claim 1 wherein the acid-or anhydride-functional polymer has a number average molecular weight of 1500 to 50,000. 16. The method of claim 1 wherein the composition is substantially free of mobile bisphenol A and aromatic glycidyl ether compounds. 17. The method of claim 16 wherein the composition is substantially free of bound bisphenol A and aromatic glycidyl ether compounds. 18. The method of claim 1 wherein the acid-or anhydride-functional polymer comprises an acid-or anhydride-functional acrylic polymer, acid-or anhydride-functional alkyd resin, acid-or anhydride-functional polyester resin, acid-or anhydride-functional polyurethane, or combinations thereof. 19. The method of claim 18 wherein the acid-or anhydride-functional polymer comprises an acid-functional acrylic polymer. 20. The method of claim 18 wherein the acid-or anhydride-functional polymer comprises a polyester polymer. 21. The method of claim 20 wherein the polyester polymer comprises one or more segments of Formula I: --O--Ar--Rn--C(O)--O--R1--O--C(O)--Rn --Ar--O-- wherein: each Ar is independently a divalent aryl group or heteroarylene group; each R is independently a divalent organic group; R1 is a divalent organic group; and each n is 0 or 1. 22. The method of claim 1 wherein the amine is a tertiary amine. 23. The method of claim 22 wherein the tertiary amine is selected from the group consisting of trimethyl amine, dimethylethanol amine, methyldiethanol amine, triethanol amine, ethyl methyl ethanol amine, dimethyl ethyl amine, dimethyl propyl amine, dimethyl 3-hydroxy-1-propyl amine, dimethylbenzyl amine, dimethyl 2-hydroxy-1-propyl amine, diethyl methyl amine, dimethyl 1-hydroxy-2-propyl amine, triethyl amine, tributyl amine, N-methyl morpholine, and mixtures thereof. 24. The method of claim 1 wherein the acid-or anhydride-functional polymer is at least 25% neutralized with the amine in water. 25. The method of claim 1 wherein the ethylenically unsaturated monomer component is polymerized in the presence of the aqueous dispersion with a water-soluble free radical initiator at a temperature of 0° C. to 100° C. 26. The method of claim 25 wherein the free radical initiator comprises a peroxide initiator. 27. The method of claim 25 wherein the free radical initiator comprises hydrogen peroxide and benzoin. 28. The method of claim 25 wherein the free radical initiator comprises a redox initiator system. 29. The method of claim 1 wherein the aqueous dispersion further comprises an organic solvent. 30. The method of claim 29 further comprising removing at least a portion of the organic solvent prior to forming the emulsion polymerized latex polymer. 31. The method of claim 1, wherein the composition is applied to a food-contact surface of the metal substrate. 32. A method of coating a food or beverage can, the method comprising: forming a composition comprising an emulsion polymerized latex polymer, comprising: forming a salt of an acid-or anhydride-functional polymer and a tertiary amine in a carrier comprising water to form an aqueous dispersion; combining an ethylenically unsaturated monomer component comprising 0.1 wt-% to 30 wt-% of an oxirane-functional alpha, beta-ethylenically unsaturated monomer with the aqueous dispersion, based on the weight of the monomer component; and polymerizing the ethylenically unsaturated monomer component in the presence of the aqueous dispersion to form an emulsion polymerized latex polymer; and applying the composition comprising the emulsion polymerized latex polymer to a metal substrate prior to or after forming the metal substrate into a food or beverage can or portion thereof.
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