Cathodically depositable coating compositions

Details Cathodically depositable coating compositions Cathodically depositable coating compositions

C - Chemistry, Metallurgy

09

D

402/134, 400/512

C09D 5/44 (2006.01)

Patent

CA 1113630

ABSTRACT OF THE DISCLOSURE Binders for cathodically depositable aqueous coating compositions comprising a basic binder system which is a blend or partial reaction product of a basic macromolecular component and an acidic macromolecular component, the ratio between acid and basic binders as expressed by amine value and acid value ranges between 97:3 and 65:35, and included in the coating compo- sition is at least one resin component modified with a compound of the general formula - OCN - R ?NH - CO - R']n wherein n is 1-3; R is an aliphatic hydrocarbon radical, or an aromatic or cycloaliphatic nucleus, preferably substituted with alkyl groups, and R' is the moiety of a saturated or unsaturated alcohol; a phenol optionally sub- stituted with alkyl radicals; a cyclic lactam; an aldoxime, a ketoxime; an acetoacetic acid ester, or a hydroxamic acid ester. The coating compositions, in addition to providing excellent cross-linking at normal curing tempera- tures and providing films with enhanced resistance to corrosion, have improved throwing power.

309512

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