Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Forming nonmetal coating
Reexamination Certificate
2007-09-04
2007-09-04
Feely, Micael J. (Department: 1712)
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Forming nonmetal coating
C523S402000, C523S414000, C523S415000, C525S528000, C525S533000, C528S068000, C528S335000, C528S340000, C528S367000
Reexamination Certificate
active
10967439
ABSTRACT:
An improved aqueous cathodic electrocoating composition that contains an anti-crater agent which is a water-reducible polyester resin having an acid value less than 40 mg KOH/g. The water-reducible polyester is the reaction product of (1) a hydroxy cyclic carbonate; (2) a polycarboxylic acid anhydride; (3) optional monofunctional epoxy resin; (4) a polyfunctional isocyanate resin; and, (5) a polyamine compound containing tertiary amine and either primary or secondary functionality. The reaction product is neutralized in the presence of acid and water to convert the tertiary amine groups to water-dilutable groups. Hydrolyzable silane groups can also be incorporated into the reaction product to further enhance its crater resistance property. The electrocoat composition produces coatings having a smoother appearance with fewer craters without adversely affecting intercoat adhesion of the cured film to subsequent coating layers applied thereover.
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Fieberg Andreas
Gam Allisa
Grawe Thomas
Ruerup Joachim
Dobson Kevin S.
E. I. duPont de Nemours and Company
Feely Micael J.
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