Epoxy coating composition and method of coating electrical article therewith

Claim 1

THE METHOD OF COATING ELECTRICAL ARTICLES WITH UNIFORM INSULATING COATINGS OF BETWEEN 10 AND 40 MILS THICKNESS BY A SINGLE DIPPING COMPRISING DIPPING A PREHATED ELECTRICAL ARTICLE INTO A SOLVENT-FREE MIXTURE COMPRISING 100 PARTS OF A LIQUID EXPOXY RESIN HAVING A 1,2-EXPOXY EQUIVALENCY GREATER THAN ONE, AN EPOXY REACTIVE POLYCARBOXYLIC ACID ANHYDRIDE, AND BETWEEN 1 AND 100 PARTS OF AN AMMONIUM CATION-MODIFIED BASE-EXCHANGE CLAY IN WHICH THE EXCHANGEABLE INORGANIC CATION OF THE CLAY HAS BEEN EXCHANGED FOR AN AMMONIUM BASE HAVING A MOLECULAR AREA OF AT LEAST 70 SQUARE ANGSTROM UNITS AND HAVING AT LEAST 3 HYDROCARBN RADICALS ATTACHED TO THE NITROGEN ATOM, AND HEATING SAID COATED ARTICLE AT A TEMPERATURE BETWEEN 150* AND 350*F. FOR A PERIOD OF TIME SUFFICIENT TO CURE THE COATING, SIAD PERIOD OF TIME BEING NOT IN EXCESS OF ABOUT TWO HOURS, AND SAID COATING COMPOSITION REMAINING IN PLACE AND RESISTING VERTICAL ALMINAR LOW DURING SAID HEATING STEP.