US2004132895A1PendingUtilityA1

Compositions and methods for coating food cans

49
Priority: Aug 30, 2002Filed: Dec 16, 2003Published: Jul 8, 2004
Est. expiryAug 30, 2022(expired)· nominal 20-yr term from priority
Inventors:Ronald R. AmbroseMichael J. ZieglerJohn M. Dudik
C08L 51/08C08L 87/005C09D 151/08C08K 5/0025C09D 167/00C08F 283/02C08L 61/00C09D 167/04C08L 33/00Y10T428/1352C08L 67/02C08L 67/06C08K 5/34922C09D 167/02C08L 61/12C09D 167/06C09D 5/08C09D 133/06C09D 133/08
49
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Claims

Abstract

A composition for coating food cans is disclosed. The composition comprises a polyester/acrylic graft copolymer, a polyester resin, and a crosslinker. Methods for coating cans using the compositions of the invention are also disclosed.

Claims

exact text as granted — not AI-modified
Therefore we claim:  
     
         1 . A composition for coating foods cans comprising: 
 (a) a polyester/acrylic graft copolymer;    (b) a polyester resin; and    (c) a crosslinker.    
     
     
         2 . The composition of  claim 1 , wherein the polyester/acrylic graft copolymer has the acrylic grafted to the polyester.  
     
     
         3 . The composition of  claim 1 , wherein the polyester/acrylic graft copolymer has the polyester grafted to the acrylic.  
     
     
         4 . The composition of  claim 1 , wherein the polyester in the polyester/acrylic graft copolymer is unsaturated.  
     
     
         5 . The composition of  claim 4 , wherein the polyester in the polyester/acrylic graft copolymer comprises maleic acid or anhydride and the acrylic copolymer comprises styrene.  
     
     
         6 . The composition of  claim 1 , wherein the polyester in the polyester/acrylic graft copolymer has a hydroxy value of 0 to 200 and an acid value of less than 10.  
     
     
         7 . The composition of  claim 6 , wherein the polyester in the polyester/acrylic graft copolymer has a hydroxy value of 30 to 70 and an acid value of less than 5.  
     
     
         8 . The composition of  claim 1 , wherein the graft copolymer has a weight average molecular weight of 3000 to 250,000.  
     
     
         9 . The composition of  claim 1 , wherein the graft copolymer has a weight average molecular weight of 60,000 to 120,000.  
     
     
         10 . The composition of  claim 1 , wherein the polyester in the polyester/acrylic graft copolymer comprises the reaction product of butanediol, ethylene glycol, cyclohexane dicarboxylic acid, isophthalic acid and/or maleic acid and/or anhydride.  
     
     
         11 . The composition of  claim 1 , wherein the acrylic in the polyester/acrylic graft copolymer comprises styrene, butyl acrylate, hydroxyethyl(meth)acrylate, ethylhexylacrylate and/or methacrylic acid.  
     
     
         12 . The composition of  claim 10 , wherein the acrylic in the polyester/acrylic graft copolymer comprises styrene, butyl acrylate, hydroxyethyl(meth)acrylate, ethylhexylacrylate and/or methacrylic acid.  
     
     
         13 . The composition of  claim 1 , wherein the weight ratio of polyester:acrylic in the graft copolymer is 95:5 to 20:80.  
     
     
         14 . The composition of  claim 13 , wherein the weight ratio of polyester:acrylic in the graft copolymer is 70:30.  
     
     
         15 . The composition of  claim 1 , wherein the crosslinker is or is derived from melamine.  
     
     
         16 . The composition of  claim 1 , wherein the crosslinker is or is derived from a resole, novalac and/or derivatives thereof that does not contain bisphenol A.  
     
     
         17 . The composition of  claim 1 , wherein the polyester resin comprises the reaction product of butanediol, ethylene glycol, cyclohexane dicarboxylic acid, isophthalic acid and/or maleic acid and/or anhydride.  
     
     
         18 . The composition of  claim 1 , wherein the polyester resin is saturated.  
     
     
         19 . The composition of  claim 1 , wherein the polyester resin is unsaturated.  
     
     
         20 . The composition of  claim 1 , wherein the polyester resin and the polyester in the graft copolymer have the same composition.  
     
     
         21 . The composition of  claim 20 , wherein the polyester resin has a higher weight average molecular weight than the polyester in the graft copolymer.  
     
     
         22 . The composition of  claim 1 , wherein the weight ratio of polyester resin to graft copolymer is 5:95 to 35:65.  
     
     
         23 . The composition of  claim 22 , wherein the weight ratio of polyester resin to graft copolymer is 25:75.  
     
     
         24 . A method for coating a food can comprising applying to the can the composition of  claim 1 .  
     
     
         25 . The composition of  claim 1 , wherein the polyester in the graft copolymer and the polyester resin comprise maleic anhydride.  
     
     
         26 . The composition of  claim 1 , wherein the composition is substantially epoxy free.

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