Nonyellowing cathodic electrocoat

Details Nonyellowing cathodic electrocoat Nonyellowing cathodic electrocoat

C - Chemistry, Metallurgy

25

D

204/97.04

C25D 13/06 (2006.01) B05D 7/00 (2006.01) C09D 5/44 (2006.01)

Patent

CA 1318881

-38- Abstract of the Disclosure Nonyellowing Cathodic Electrocoat A method of preventing the yellowing of the outermost coating of a multicoat coating system is disclosed. The method comprises initially depositing onto a conductive substrate by cathodic electrodeposition a primer coating comprising at least one layer of an amine-epoxy resin adduct and a cross-linking agent, and then curing said primer to a hard, durable film. Then, depositing a second coating onto the primer layer comprising at lea t one layer of a pigmented film forming basecoat. Then depositing a third outermost coating onto the second coating comprising at least one layer of a clear, film-forming topcoat, and then curing the basecoat and topcoat. The primer coating contains a cross-linking agent selected from the group consisting of aliphatic polyisocyanates containing at least six carbon atoms, the isocyanurates of aliphatic polyisocyanates containing at least six carbon atoms, aromatic polyisocyanates having a molecular weight greater than 174, and the isocyanurates of aromatic diisocyanates having a molecular weight greater than 174. The polyisocyanates or isocyanurates are blocked with a blocking agent.

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