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Process for electrodepositing mica on coil or bar connections and resulting products

  • US 4,615,778 A
  • Filed: 02/19/1985
  • Issued: 10/07/1986
  • Est. Priority Date: 11/25/1983
  • Status: Expired due to Fees
First Claim
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1. A process for depositing an insulating coating on bare portions of electrical connection members comprising the steps of(a) immersing the bare electrical connections in an aqueous electrodeposition composition consisting essentially in weight percent of 5-35% of particulated mica, 0.2-2% of a water soluble anionic resin binder as calculated in resin solids, 0.001-0.20% of an electrolyte, up to 0.3% of a nonionic surfactant and a polar solvent;

  • (b) electrodepositing said composition on the bare electrical connections and forming a dry micaceous coating of substantially uniform thickness, said coating being porous and containing a sufficient amount of binder to hold the mica particles together;

    (c) impregnating the porous coating with an impregnative resin varnish; and

    (d) subjecting the impregnated coating to an elevated temperature bake to cure the resin varish.

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