Electrodepositable coating compositions and methods of coating substrates
AssigneePPG Industries Ohio, Inc.
InventorsCorey James DeDomenic, Christophe Rene Gaston Grenier, Lyanne Valdez, Scott Joseph Moravek, Reza Michael Rock, Tanvi Siraj Ratani, Douglas Gordon Montjoy
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Abstract
The present disclosure is directed to a cationic electrodepositable coating composition comprising a cationic-salt group-containing, film-forming polymer; a polymer comprising at least one phosphorylated group; and a curing agent. Also disclosed are methods of coating substrates and coated substrate.
Claims20
A cationic electrodepositable coating composition comprising:
- a cationic-salt group-containing, aromatic film-forming polymer in amount of at least 10% by weight, based on the total weight of the resin solids;
- an addition polymer comprising at least one phosphorylated group and optionally at least one hydroxyl functional group, wherein the addition polymer does not include a cationic or anionic-salt group when the addition polymer comprises a (meth)acrylamide monomer, and the addition polymer comprises less than 60% by weight of constitutional units comprising the residue of a hydroxyl-functional (meth)acrylate monomer and/or a hydroxyl-functional (meth)acrylamide monomer, based on the total weight of the addition polymer;
- and
- a curing agent.
(canceled)
A cationic electrodepositable coating composition comprising:
- a cationic-salt group-containing, film-forming polymer;
- a phosphatized epoxy resin;
- and
- a curing agent.
A method of coating a metal substrate comprising:
- (1) immersing a surface to be coated of the metal substrate into a cationic electrodepositable coating composition comprising:
- (a) a cationic-salt group-containing, film-forming polymer;
- (b) a curing agent;
- and
- (c) a source of phosphate ions or a polymer comprising at least one phosphorylated group, wherein the metal substrate serves as a cathode in electrical communication with an anode immersed in the cationic electrodepositable coating composition;
- (2) allowing the immersed metal substrate to dwell in the cationic electrodepositable coating composition for a period of time, whereby a metal phosphate layer forms over at least a portion of the surface of the metal substrate;
- and
- (3) applying a direct electrical current between the cathode and the anode whereby a coating is deposited onto the surface of the metal substrate from the cationic electrodepositable coating composition.
17-19. (canceled)
Dependencies are inferred from the claim text.