Back to results
US 7,803,415 B2Granted
Methods for coating food cans
AssigneePPG Industries Ohio, Inc.
InventorsLaura Kiefer-Liptak, John M. Dudik, Ronald R. Ambrose, Kevin C. Olson, Padmanabhan Sundararaman
Life of this patent
Estimating the term…
Abstract
A composition for coating food cans is disclosed. The composition comprises a polyester, an acrylic copolymer and a crosslinker; the polyester and acrylic copolymer have been compatibilized in some way, such as through graft copolymerization. Methods for compatibilizing acrylics and polyesters are also disclosed as are methods for coating cans using compositions comprising acrylic and polyesters.
Claims16
A method for coating the inside of a food can comprising applying to the can 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 blended together, have been grafted together, or have formed interpenetrating networks, but when the polyester and acrylic copolymer have been blended, 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;
- and
- wherein any polyester and any acrylic copolymer present in the composition is epoxy free.
5 more elements
Dependencies are inferred from the claim text.