Aqueous Dispersions and Coatings

Abstract

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.

1 . A composition, comprising: an aqueous dispersion of a quaternary ammonium salt, wherein the salt comprises the reaction product of an oxirane-functional vinyl addition polymer having an oxirane functionality of 0.5 to 5; an acid-functional polymer having an acid number of 30 to 500; and a tertiary amine.  
     
     
         2 . The composition of  claim 1 , wherein the composition is substantially free of mobile BPA and aromatic glycidyl ether compounds.  
     
     
         3 . The composition of  claim 1 , wherein the composition is essentially free of BPA and aromatic glycidyl ether compounds.  
     
     
         4 . The composition of  claim 1 , wherein the composition is essentially completely free of BPA and aromatic glycidyl ether compounds.  
     
     
         5 . The composition of  claim 1 , wherein the composition is completely free of BPA and aromatic glycidyl ether compounds.  
     
     
         6 . The composition of  claim 1 , wherein the quaternary ammonium salt comprises at least 0.8 equivalents of tertiary amine per equivalent of oxirane group.  
     
     
         7 . The composition of  claim 1 , further comprising a crosslinker.  
     
     
         8 . The composition of  claim 7 , wherein the crosslinker is present in an amount of at least 5% by weight, based on the total weight of resin solids in the coating composition.  
     
     
         9 . The composition 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.  
     
     
         10 . The composition of  claim 1 , wherein the ratio of amine groups in the tertiary amine to oxirane groups in the oxirane-functional vinyl addition polymer is between 0.8:1 and 5:1.  
     
     
         11 . A coated article, comprising: 
 a substrate; and    the coating composition of  claim 1  applied to the substrate.    
     
     
         12 . The coated article of  claim 11 , wherein the coating composition further comprises a crosslinker.  
     
     
         13 . The coated article of  claim 12 , wherein the crosslinker is present in an amount of at least 5% by weight, based on the total weight of resin solids in the coating composition.  
     
     
         14 . The coated article of  claim 11 , wherein the coating composition comprises a cured coating.  
     
     
         15 . The coated article of  claim 14 , wherein the cured coating includes a crosslinked polymer having a crosslink segment of the general formula:  
         —Y—C(R 2 )—C(R)(OH)—C(R 2 )—O—(O)C—X r —,  
       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.  
     
     
         16 . The coated article of  claim 11 , wherein the coated article comprises a food or beverage container.  
     
     
         17 . The coated article of  claim 11 , wherein the coating composition comprises a food contact coating.  
     
     
         18 . A method of coating an article, the method comprising applying the composition of  claim 1  to a substrate surface and hardening the composition.  
     
     
         19 . A packaging article, comprising a food contact surface having a cured film thereon, wherein the cured film comprises a crosslinked polymer having a crosslink segment of the general formula:  
         —Y—C(R 2 )—C(R)(OH)—C(R 2 )—O—(O)C—X r —,  
       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.