US 12,331,143 B2
Corrosion-resistant primer and topcoat composition
Jason Lindquist, Lino Lake, MN (US); Jason Ness, Woodbury, MN (US); Josh Hewuse, Eagan, MN (US); Garry Edgington, Fridley, MN (US); Tapan Debroy, Victoria, MN (US); and James Gallagher, Minneapolis, MN (US)
Assigned to SWIMC LLC, Cleveland, OH (US)
Appl. No. 17/053,104
Filed by SWIMC LLC, Cleveland, OH (US)
PCT Filed May 7, 2019, PCT No. PCT/US2019/031069
§ 371(c)(1), (2) Date Nov. 5, 2020,
PCT Pub. No. WO2019/217384, PCT Pub. Date Nov. 14, 2019.
Claims priority of provisional application 62/667,668, filed on May 7, 2018.
Prior Publication US 2021/0139624 A1, May 13, 2021
Int. Cl. C08F 222/10 (2006.01); B05D 7/00 (2006.01); C09D 5/00 (2006.01); C09D 5/08 (2006.01); C09D 163/00 (2006.01); C09D 175/04 (2006.01)
CPC C08F 222/1025 (2020.02) [B05D 7/54 (2013.01); C09D 5/002 (2013.01); C09D 5/08 (2013.01); C09D 163/00 (2013.01); C09D 175/04 (2013.01); B05D 2202/00 (2013.01)] 27 Claims
OG exemplary drawing
 
1. A primer coating composition for application directly to a metal substrate, the primer coating composition comprising:
a resin composition, at least a portion of which includes an epoxy backbone, the resin composition comprising:
at least one Michael addition acceptor (MA acceptor) selected from esters of (meth)acrylic acid; and
at least one Michael addition donor (MA donor) selected from dialkyl malonates, cyanoacetates, chloroacetates, acetoacetates, propionyl acetates, malononitrile, acetonitrile, acetylacetone, dipropionyl methane, or mixtures or combinations thereof;
a latent catalyst;
wherein both the MA acceptor and the MA donor provide the epoxy backbone portion of the resin composition,
wherein the primer coating composition is capable of cure to the metal substrate in about 1 to 10 minutes at 150° F. or the primer coating composition is cured to the metal substrate in about 12 hours or less at ambient temperature, and wherein a cured coating directly applied to the metal substrate and formed from the primer coating composition is corrosion-resistant; and
wherein the resin composition includes at least a portion having an aromatic epoxy backbone, and wherein the MA acceptor, the MA donor, or a combination of the MA acceptor and MA donor provide the aromatic epoxy backing portion of the resin composition.