US 12,486,411 B2
Method of applying a one-component waterborne coating composition to a substrate utilizing a high transfer efficiency applicator
Shih-Wa Wang, Glen Mills, PA (US); Michael S. Wolfe, Wilmington, DE (US); John R. Moore, Lansdale, PA (US); and Petra Stoffel, Cologne (DE)
Assigned to AXALTA COATING SYSTEMS IP CO., LLC, Wilmington, DE (US)
Filed by AXALTA COATING SYSTEMS IP CO., LLC, Wilmington, DE (US)
Filed on Apr. 27, 2022, as Appl. No. 17/660,850.
Claims priority of provisional application 63/182,447, filed on Apr. 30, 2021.
Prior Publication US 2022/0356359 A1, Nov. 10, 2022
Int. Cl. B05D 1/02 (2006.01); C09D 11/023 (2014.01); C09D 11/03 (2014.01); C09D 11/102 (2014.01); C09D 11/107 (2014.01); C09D 11/38 (2014.01)
CPC C09D 11/023 (2013.01) [C09D 11/03 (2013.01); C09D 11/102 (2013.01); C09D 11/107 (2013.01); C09D 11/38 (2013.01)] 18 Claims
 
1. A method of applying a one-component waterborne coating composition to a substrate utilizing a high transfer efficiency applicator to form a coating layer disposed on the substrate, the 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 actives based on a total weight of the coating composition,
wherein the coating composition has a pH of greater than about 7 and comprises:
A. a resin dispersion comprising a latex, a polyurethane, or combinations thereof;
B. an optional cross-linker;
C. an optional pigment;
D. water;
E. a water-soluble solvent; and
F. at least one rheology control agent chosen from an alkali swellable emulsion, a layered silicate, and combinations thereof;
wherein the coating composition has a viscosity of about 20 to about 100 mPa·s as determined using ASTM 7867-13 with cone-and-plate or parallel plates at a shear rate of 1000 sec-1,
wherein the coating composition has a viscosity of from about 2000 to about 6500 mPa·s as determined using ASTMD7867 at a shear rate of 0.1 sec-1,
wherein the coating composition has a wet film thickness of at least 20 microns measured at about 45 degrees without visible sag, and
wherein the coating composition has a wet film thickness of at least 71 microns measured at about 45 degrees without fat edge.