Nonyellowing cathodic electrocoat

Details Nonyellowing cathodic electrocoat Nonyellowing cathodic electrocoat

1986-10-20

1988-07-05

Niebling, John F.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

2041811, 2041817, 427409, 427410, 428413, 428418, C25D 1306, B32B 702, B32B 2738, B32G 1508

Patent

active

047554185

ABSTRACT:
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 least 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.

REFERENCES:
patent: 3984299 (1976-10-01), Jerabek
patent: 4038232 (1977-07-01), Bosso et al.
patent: 4246151 (1981-01-01), Dohy et al.
patent: 4345004 (1982-08-01), Miyata et al.
patent: 4375498 (1983-03-01), Le Minez et al.
patent: 4456507 (1984-06-01), Kivel et al.
patent: 4508767 (1985-04-01), Hokamura et al.

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