Coated containers

Abstract

A coated container and a method for coating a container are disclosed. The coating on the container is derived from a composition comprising: a hydroxyl functional polyester comprising a reaction product prepared from a reaction mixture comprising: (i) an organic polycarboxylic acid, and (ii) a polyol component comprising tetramethyl-1,3-cyclobutane diol are disclosed.

1 . A container comprising a thermoset coating applied to at least a portion thereof, the coating derived from a composition comprising:
 a hydroxyl functional polyester comprising a reaction product prepared from a reaction mixture comprising:   (i) an organic polycarboxylic acid and/or ester and/or anhydride thereof, and   (ii) a polyol component comprising tetramethyl-1,3-cyclobutane diol.   
     
     
         2 . The container of  claim 1  wherein the polyester has a number average molecular weight of 2000 to 15,000 Daltons. 
     
     
         3 . The container of  claim 1  wherein the polyester has a hydroxyl number of 5 to 40. 
     
     
         4 . The container of  claim 1  wherein the organic polycarboxylic acid comprises naphthalene dicarboxylic acid, phthalic acid, isophthalic acid, terphthalic acid maleic acid, cyclohexane dicarboxylic acid and/or adipic acid. 
     
     
         5 . The container of  claim 1  wherein the polyol component further comprises 2-methyl-1,3-propane diol. 
     
     
         6 . The container of  claim 1  wherein the tetramethyl-1,3-cyclobutane diol is present in amounts of 10 to 100 percent by weight based on total weight of the polyol component. 
     
     
         7 . The container of  claim 1  in which the equivalent ratio of polyol to polycarboxylic acid is from 1.0 to 1.5:1. 
     
     
         8 . The container of  claim 1  in which the composition further comprises a curing agent. 
     
     
         9 . The container of  claim 8  in which the curing agent comprises phenolplast and/or aminoplast. 
     
     
         10 . The container of  claim 1  in which the composition is substantially free of bisphenol A and derivatives thereof. 
     
     
         11 . The container of  claim 1  in which the composition is essentially free of bisphenol A and derivatives thereof. 
     
     
         12 . The container of  claim 1  in which the composition is completely free of bisphenol A and derivatives thereof. 
     
     
         13 . A container comprising a thermoset coating applied to at least a portion thereof, the coating derived from a composition comprising:
 (a) from 10 to 95 percent by weight based on weight of resin solids of a hydroxyl functional polyester comprising a reaction product prepared from a reaction mixture comprising:
 (i) an organic polycarboxylic acid comprising naphthalene dicarboxylic acid, 
 (ii) a polyol component comprising from 10 to 100 percent by weight based on total weight of polyol of tetramethyl-1,3-cyclobutane; 
   (b) from 5 to 30 percent by weight based on weight of resin solids of a phenolplast and/or an aminoplast curing agent.   
     
     
         14 . The container of  claim 12  wherein the container comprises a food can. 
     
     
         15 . The container of  claim 13  wherein the container comprises a food can. 
     
     
         16 . A method of coating a container comprising:
 (a) applying to a surface of the container the composition of  claim 1     (b) heating the composition applied in step (a) to a temperature sufficient to cure the composition.   
     
     
         17 . The method of  claim 16  in which step (a) is by spraying or roll coating. 
     
     
         18 . The method of  claim 16  in which step (b) is conducted at a temperature of 150 to 300° C.