Compositions and methods for coating food cans

Abstract

A coated food can is disclosed.

1 . A food can coated with a composition comprising:
 (a) a polyester;   (b) an acrylic copolymer;   (c) a crosslinker; and   (d) a solvent,   
       wherein the polyester and acrylic copolymer have been either blended together or grafted together, but when the polyester and acrylic copolymer have been blended together, the acrylic copolymer does not have pendant glycidyl groups when the polyester is acid terminated and the acrylic copolymer does not have pendant hydroxy groups when the polyester is hydroxy terminated. 
     
     
         2 . The food can of  claim 1 , wherein the acrylic copolymer comprises acrylamide functionality. 
     
     
         3 . The food can of  claim 1 , wherein the polyester and acrylic copolymer are grafted together. 
     
     
         4 . The food can of  claim 1 , wherein the polyester is unsaturated. 
     
     
         5 . The food can of  claim 4 , wherein the polyester comprises maleic acid or anhydride and the acrylic copolymer comprises styrene. 
     
     
         6 . The food can of  claim 1 , wherein the polyester comprises the reaction product of butanediol, ethylene glycol, cyclohexane dicarboxylic acid, isophthalic acid and maleic acid and/or anhydride. 
     
     
         7 . The food can of  claim 1 , wherein the acrylic copolymer comprises styrene, butyl acrylate, ethylhexylacrylate and/or methacrylic acid. 
     
     
         8 . The food can of  claim 1 , wherein the acrylic copolymer comprises maleic acid and/or anhydride. 
     
     
         9 . The food can of  claim 1 , wherein the crosslinker is or is derived from phenolic. 
     
     
         10 . The food can of  claim 1 , wherein the crosslinker is or is derived from a resole or novalac that does not contain bisphenol A. 
     
     
         11 . The food can of  claim 1 , wherein the composition further comprises:
 (e) a second polyester.   
     
     
         12 . The food can of  claim 11 , wherein the (e) second polyester comprises the reaction product of butanediol, ethylene glycol, cyclohexane dicarboxylic acid, isophthalic acid and/or maleic acid and/or anhydride. 
     
     
         13 . The food can of  claim 11 , wherein the (e) second polyester is saturated. 
     
     
         14 . The food can of  claim 11 , wherein the (e) second polyester is unsaturated. 
     
     
         15 . The food can of  claim 11 , wherein the (e) second polyester and the (a) polyester have the same composition. 
     
     
         16 . The food can of  claim 15 , wherein the (e) second polyester has a higher weight average molecular weight than the (a) polyester. 
     
     
         17 . The food can of  claim 11 , wherein the (e) second polyester and the (a) polyester have a different composition. 
     
     
         18 . The food can of  claim 11 , wherein the (a) polyester and the (e) second polyester comprise maleic anhydride. 
     
     
         19 . The food can of  claim 1 , wherein the composition is substantially epoxy free. 
     
     
         20 . The food can of  claim 11 , wherein the composition is substantially epoxy free.