The present invention provides aqueous dispersions that, for example, include the reaction product of an oxirane-functional vinyl addition polymer having an oxirane functionality between 0.5 and 5; an acid-functional polymer having an acid number 30 to 500; and a tertiary amine. Also described are c
The present invention provides aqueous dispersions that, for example, include the reaction product of an oxirane-functional vinyl addition polymer having an oxirane functionality between 0.5 and 5; an acid-functional polymer having an acid number 30 to 500; and a tertiary amine. Also described are coating compositions containing the dispersion and methods of forming the dispersion.
대표청구항▼
1. A method, comprising: providing a coating composition comprising an aqueous dispersion including: a reaction product of an oxirane-functional vinyl addition polymer, an acid-functional polymer, and a tertiary amine, anda crosslinker; andapplying the aqueous dispersion to a metal substrate of a fo
1. A method, comprising: providing a coating composition comprising an aqueous dispersion including: a reaction product of an oxirane-functional vinyl addition polymer, an acid-functional polymer, and a tertiary amine, anda crosslinker; andapplying the aqueous dispersion to a metal substrate of a food or beverage can; andhardening the aqueous dispersion to form a cured film. 2. The method of claim 1, wherein the crosslinker comprises a phenoplast resin. 3. The method of claim 2, wherein the phenoplast resin comprises the condensation product of an aldehyde with a phenol. 4. The method of claim 3, wherein the aldehyde comprises formaldehyde. 5. The method of claim 3, wherein the aldehyde comprises acetaldehyde. 6. The method of claim 3, wherein the phenol comprises phenol, cresol, p-phenylphenol, p-tert-butylphenol, p-tert-amylphenol, or cyclopentylphenol. 7. The method of claim 2, wherein the phenoplast resin comprises a condensation product of (i) formaldehyde or acetaldehyde and (ii) phenol, cresol, p-phenylphenol, p-tert-butylphenol, p-tert-amylphenol, or cyclopentylphenol. 8. The method of claim 2, wherein the coating composition includes at least 5% by weight of the phenoplast resin, based on the total weight of resin solids in the coating composition. 9. The method of claim 1, wherein the acid-functional polymer is an acid-functional vinyl addition polymer. 10. The method of claim 9, wherein the acid-functional vinyl addition polymer comprises, by weight, 5 to 20 parts styrene, 30 to 70 parts alkyl (meth)acrylate, and 30 to 70 parts acid-functional monomer. 11. The method of claim 1, wherein the oxirane-functional vinyl addition polymer has a number average molecular weight of 2,500 to 20,000, and wherein the acid-functional polymer has a number average molecular weight of from 2,000 to 15,000. 12. The method of claim 1, wherein the coating composition is substantially free of BPA. 13. The method of claim 1, wherein the coating composition is substantially free of BPA and aromatic glycidyl ether compounds. 14. The method of claim 1, wherein the oxirane-functional vinyl addition polymer has an oxirane functionality of 0.5 to 5, and wherein the acid-functional polymer has an acid number of 30 to 500. 15. The method of claim 1, wherein the weight ratio of the oxirane-functional vinyl addition polymer to acid-functional polymer is between 90:10 and 50:50. 16. The method of claim 1, wherein the cured film includes a crosslinked polymer having a crosslink segment of the general formula: —Y—C(R2)—C(R)(OH)—C(R2)—O—(O)C—Xr—,wherein: Y is a divalent organic group; X is a divalent organic group; R is H, or a C1 to C6 organic group; and r is 0 or 1. 17. The method of claim 1, wherein the food or beverage can comprises a two-piece drawn and ironed can. 18. A method, comprising: providing a coating composition comprising an aqueous dispersion including: a reaction product of an oxirane-functional vinyl addition polymer, an acid-functional polymer, and a tertiary amine, anda phenoplast resin;spray applying the coating composition on an inside surface of a metal food or beverage can; andhardening the aqueous dispersion to form a cured film. 19. The method of claim 18, wherein the acid-functional polymer is an acid-functional vinyl addition polymer. 20. A method, comprising: providing a coating composition that is substantially free of BPA and aromatic glycidyl ether compounds, the coating composition comprising an aqueous dispersion including: a reaction product of an oxirane-functional vinyl addition polymer, an acid-functional vinyl addition polymer, and a tertiary amine, anda phenoplast resin;spray applying the coating composition on an inside surface of a metal food or beverage can; andhardening the aqueous dispersion to form a cured film.
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