Cross-linked polyester protective coatings
AssigneeValspar Sourcing, Inc.
InventorsPeter Mayr, James Robinson, Fritz Altmann
Life of this patent
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Abstract
The invention relates to protective coating systems derived from a functional polyester resin, a cross-linker and a phenol-formaldehyde resin. Also provided is a method of coating a metal substrate using the protective coating systems to produce a cross-linked protective coating. Further provided is a composite material prepared with the coating system and, in certain embodiments, useful in fabricating metal foodstuffs storage containers. The composite material may be particularly useful in fabricating foodstuffs storage containers and “easy-open” end closures wherein the cross-linked protective coating contacts the foodstuffs.
Claims21
A composition comprising:
- a hydroxyl-functional polyester resin,
- a carboxyl-functional polyester resin having an acid number from about 100 to about 300 milligrams KOH per gram,
- a cross-linker, and
- one or more phenol-formaldehyde resin;
- wherein the composition is in the form of a hardenable coating composition and is substantially free of BPA, BPF, BADGE and BFDGE.
A composition, comprising:
- one or more functional polyester resin having at least one hydroxyl group, at least one carboxylic group, a hydroxyl number from about 5 to about 150 milligrams KOH per gram, and an acid number of from about 50 to about 250 milligrams KOH per gram,
- a cross-linker, and
- one or more phenol-formaldehyde resin;
- wherein the composition is in the form of a hardenable coating composition and is substantially free of BPA, BPF, BADGE and BFDGE.
A method of applying a hardenable coating composition to a metal substrate, comprising:
- applying a first hardenable coating composition to at least one surface of a substrate,
- applying a second hardenable coating composition over the first hardenable coating composition, said second hardenable coating composition including:
- a hydroxyl-functional polyester resin,
- a carboxyl-functional polyester resin having an acid number from about 100 to about 300 milligrams KOH per gram,
- a cross-linker, and
- a phenol-formaldehyde resin,
- wherein the second hardenable coating composition is substantially free of BPA, BPF, BADGE and BFDGE;
- and
- curing the first and second hardenable coating compositions to provide a hardened composite coating on the metal substrate.
Dependencies are inferred from the claim text.