Importance

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Abstract

The present invention is directed to improved conductive primer compositions and methods. In the improved methods aspect of the present invention, a non-conductive polymeric component is precoated with a primer to render it electroconductive in preparation for electrocoating. Next, the primed polymeric comonent is assembled with a conductive metallic component to form a multi-material workpiece. Finally, the formed workpiece is submerged in an electrocoat bath for simultaneously electrocoating both the primed polymeric component and the conductive metallic component. In some preferred embodiments, the workpiece may be an automobile body. In the improved electroconductive primer compositions aspect of the present invention, such compositions comprise a dispersion of approximately 70% to 90% of a polymeric resinous which will cure to form a film, approximately 10% to 30% of a conductive carbon pigment, in some embodiments approximately 0.25 to 0.45 of an electron transmitting or other surfactant or dispersing agent, and a sufficient volume of solvents to provide a flowable viscosity to the primer. Such primer may be formed from a wide variety of different resins.

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First Claim