Back to results
US 12,734,549 B2Granted
Two-coat single cure powder coating
AssigneeThe Sherwin-Williams Company
InventorsOwen H. Decker, Thomas E. Reno, Robert D. Breitzman, Carlos A. Concha, Jeffrey D. Rogozinski, Keith M. Kirkwood
Life of this patent
Estimating the term…
Abstract
Methods and systems for coating metal substrates are provided. The methods and systems include sequential application of low flow and high flow powder coatings followed by a single heating step to provide a cured coating. The methods and systems include a marker that allows coating uniformity to be monitored and assessed during application. The described methods provide coatings with optimal surface smoothness and edge coverage.
Claims18
A method of coating a substrate, comprising:
- providing a substrate;
- providing a first coating comprising a first powder composition, wherein the first powder composition has a flow of no more than about 40 mm;
- providing a second coating comprising a second powder composition, wherein the second powder composition has a flow of at least about 50 mm, wherein the second coating is unpigmented;
- and
- heating the first powder coating composition and second powder coating composition in a single step to form a cured coating,
- wherein the first and/or second powder composition comprises a carboxyl-functional polyester resin cured with polymeric epoxy resins, hydroxyl-functional polyester resins cured with blocked isocyanates or uretdiones, epoxy resins cured with amines, or hydroxyl-functional acrylic resins cured with blocked isocyanates or uretdiones.
3 more elements
A coated article, comprising:
- a substrate;
- a first coating comprising a first powder composition deposited on the substrate, wherein the first powder composition has a flow of no more than about 40 mm;
- a second coating comprising a second powder composition deposited on the first powder composition, wherein the first powder composition has a flow of at least about 50 mm, wherein the second coating is unpigmented;
- and
- wherein the first powder coating composition and second powder coating composition are heated in a single step to form a cured coating, and
- wherein the first and/or second powder composition comprises a carboxyl-functional polyester resin cured with polymeric epoxy resins, hydroxyl-functional polyester resins cured with blocked isocyanates or uretdiones, epoxy resins cured with amines, or hydroxyl-functional acrylic resins cured with blocked isocyanates or uretdiones.
3 more elements
Dependencies are inferred from the claim text.