	US 12,286,724 B1
	Polyester coating composition for electrodeposition and methods of coating a beverage end coil substrate
Cassandra Smith, Coraopolis, PA (US); Arthur Riazzi, Harrison City, PA (US); and Adam Cieslinski, Freeport, PA (US)
Assigned to SWIMC LLC, Cleveland, OH (US)
Filed by SWIMC LLC, Cleveland, OH (US)
Filed on Dec. 22, 2023, as Appl. No. 18/394,063.
Claims priority of provisional application 63/476,823, filed on Dec. 22, 2022.
Int. Cl. C25D 9/02 (2006.01)

CPC C25D 9/02 (2013.01)

17 Claims

1. A method of coating a beverage end coil substrate in an industrial coating line, the method comprising:

contacting the beverage end coil substrate with an aqueous coating composition, wherein the beverage end coil is positively charged;

electrodepositing coating solids from the aqueous coating composition onto the beverage end coil substrate, wherein the aqueous coating composition includes more than about 60 weight percent, based on resin solids, of a polyester polymer and less than about 1.2 kg/L of volatile organic content as measured pursuant to ASTM 02369-90, based on the total weight of the aqueous coating composition;

curing the electrodeposited coating solids to form a hardened coating on the beverage end coil substrate;

wherein the polyester polymer includes one or more anionic groups located in a pendant group attached to a backbone of the polyester polymer and wherein the pendant group includes a reaction product of an unsaturated compound having at least one salt or salt-forming group, and wherein the pendant group is attached to another portion of the polymer via reaction of the unsaturated compound with one or more double or triple bonds, with the proviso that the reaction of the unsaturated compound with the one or more double or triple bonds does not require the participation of a free-radical initiator; and

wherein the unsaturated compound includes sorbic acid, maleic acid, fumaric acid, nadic acid, tetrahydrophthalic acid, anhydride derivatives thereof, or combinations thereof.