Polymeric additive for cathodic electrocoating compositions...

Details Polymeric additive for cathodic electrocoating compositions... Polymeric additive for cathodic electrocoating compositions...

C - Chemistry, Metallurgy

09

D

C09D 5/44 (2006.01) C08G 59/40 (2006.01) C09D 163/00 (2006.01)

Patent

CA 2157965

An improved aqueous cathodic electrocoating composition having a binder of an epoxy-amine adduct which is of an epoxy resin that has been reacted with an amine, and a blocked polyisocyanate crosslinking agent; wherein the improvement is the use of a water soluble electrically conductive polymeric additive of a polyepoxy hydroxy ether resin reacted with a ketimine and optionally up to 60% of the epoxy end groups of the resin reacted with another amine and the resin has an epoxy equivalent weight of about 500-900, a weight average molecular weight of about 1,000-5,000 and an electrical conductivity of about 4,000-8,000 microsiemens to provide an electrocoating composition having improved throw power.

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