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US 2024/0226959 A1Published application
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
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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.
Claims20
A method of coating a substrate, comprising:
- providing a substrate;
- providing a first coating comprising a first powder composition with flow of no more than about 40 mm;
- providing a second coating comprising a second powder composition with flow of at least about 40 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 cured coating comprises a surface smoothness of at least 4 on the PCI scale, and edge coverage equal to at least 2% of face coverage.
3 more elements
A coated article, comprising:
- a substrate;
- a first coating comprising a first powder composition deposited on the substrate with a flow of no more than about 40 mm;
- a second coating comprising a second powder composition deposited on the first powder composition with flow of at least about 40 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 cured coating comprises a surface smoothness of at least 4 on the PCI scale, and edge coverage equal to at least 2% of face coverage.
3 more elements
Dependencies are inferred from the claim text.