Electrodepositable coating composition comprising a bismuth salt and a stabilizing compound
AssigneePPG Industries Ohio, Inc.
InventorsAlan J. Kaylo, Kevin J. Dufford, Steven D. Perrine, Michael J. Pawlik, Richard F. Karabin
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Abstract
The present invention is directed to an electrodepositable coating composition comprising a bismuth salt and a stabilizing agent, and wherein the molar ratio of elemental bismuth to the stabilizing agent is not less than 1:0.25.
Claims18
An electrodepositable coating composition comprising an ionic film-forming polymer, a bismuth salt, and a stabilizing agent comprising 2-mercapto-5-methyl-1,3,4-thiadiazole, 2,5-dimercapto-1,3,4-thiadiazole, 2-mercaptobenzothiazole, or combinations thereof;
- and wherein the molar ratio of elemental bismuth to the stabilizing agent is 1:0.27, 1:0.28 or from 1:0.001 to 1:0.25.
A method for making an electrodepositable coating composition comprising:
- (i) a first component, (ii) a second component, and (iii) a third component;
- the method comprising:
- dispersing components (i), (ii), and (iii), into an aqueous solution;
- wherein component (i) comprises an ionic film-forming polymer, a curing agent that is capable of reacting with the film-forming polymer, and, optionally, a stabilizing agent;
- wherein component (ii) comprises a water-dispersible grind resin, a pigment, and, optionally, a stabilizing agent;
- and wherein component (iii) comprises a water-dispersible grind resin, and, optionally, a stabilizing agent;
- wherein one or more of components (i), (ii), and (iii) comprises a bismuth salt;
- wherein one or more of components (i), (ii), and (iii) comprises the stabilizing agent, said stabilizing agent comprising 2-mercapto-5-methyl-1,3,4-thiadiazole, 2,5-dimercapto-1,3,4-thiadiazole, 2-mercaptobenzothiazole, or combinations thereof;
- and wherein the molar ratio of elemental bismuth to the stabilizing agent in the electrodepositable coating is 1:0.27, 1:0.28 or from 1:0.001 to 1:0.25.
Dependencies are inferred from the claim text.