US 12,447,498 B2
Method of applying a coating composition to a substrate
Michael S. Wolfe, Wilmington, DE (US); Cameron Stevens, Philadelphia, PA (US); James Neal, Corvallis, OR (US); Petra Stoffel, Cologne (DE); and Matthias Baltrusch, Leverkusen (DE)
Assigned to AXALTA COATING SYSTEMS IP CO., LLC, Wilmington, DE (US)
Appl. No. 18/687,458
Filed by AXALTA COATING SYSTEMS IP CO., LLC, Wilmington, DE (US)
PCT Filed Aug. 26, 2022, PCT No. PCT/US2022/075615
§ 371(c)(1), (2) Date Feb. 28, 2024,
PCT Pub. No. WO2023/034764, PCT Pub. Date Mar. 9, 2023.
Claims priority of provisional application 63/260,721, filed on Aug. 30, 2021.
Prior Publication US 2025/0128286 A1, Apr. 24, 2025
Int. Cl. B05D 1/02 (2006.01)
CPC B05D 1/02 (2013.01) [B05D 2401/10 (2013.01); B05D 2502/00 (2013.01); B05D 2508/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method of applying a one-component solvent-borne coating composition to a substrate utilizing a high transfer efficiency applicator to form a coating layer disposed on the substrate, said method comprising the steps of:
providing the coating composition to the high transfer efficiency applicator; and
applying the coating composition to the substrate through the high transfer efficiency applicator to form the coating layer on the substrate wherein a loss of volatiles after application through the high transfer efficiency applicator is less than about 0.5 weight percent based on a total weight of the coating composition,
wherein the coating composition comprises:
A. a resin comprising an acrylic, a polyester, or combinations thereof;
B. a melamine cross-linker;
C. an optional pigment;
D. an organic solvent; and
E. a polyamide wax comprising the reaction product of (i) a fatty acid derived from a C16-C48 fatty acid; and (ii) a polyamine having an amine functionality of two or more, and is present in an amount of from about 0.1 to about 4 weight percent based on a total weight of the coating composition;
wherein the coating composition has a wet film thickness of at least about 30 microns measured at about 45 degrees without visible sag after cure at a temperature of about 60° C. or higher for at least 5 minutes;
wherein the coating composition has a viscosity measured at a shear rate of about 1 s-1 that recovers, after a high shear rate of about 10000 s-1 is applied for about 20 seconds, to within about 95% of a steady state viscosity achieved at greater than about 100 seconds of continuous shearing at about 1 s-1, in less than about 5 seconds; and
wherein the coating composition has a complex viscosity measured at a temperature of about 60° C. that is reduced to from about 60 to about 500 mPa-s when the complex viscosity measured at about 30° C. is from about 800 to about 8000 mPa-s.