Patent ID: 7803457

Claim:
An article comprising: an electrical component, the electrical component being an electrical conduction winding, stator bar, or a stator piece; and an electrically insulating layer disposed upon the electrical component, wherein the electrically insulating layer comprises a thermosetting polymer and a nanosized filler; wherein the thermosetting polymer comprises polyurethanes, phenolics, silicones, polycarbonates, polystyrenes, polyesters, polyarylates, polyarylsulfones, polyethersulfones, polyphenylene sulfides, polysulfones, polytetrafluoroethylenes, polyetherketones, polyether etherketones, polyether ketone ketones, polybenzoxazoles, polyoxadiazoles, polybenzothiazinophenothiazines, polybenzothiazoles, polypyrazinoquinoxalines, polyquinoxalines, polybenzimidazoles, polyoxindoles, polyoxoisoindolines, polydioxoisoindolines, polytriazines, polypyridazines, polypiperazines, polypyridines, polypiperidines, polytriazoles, polypyrazoles, polycarboranes, polyoxabicyclononanes, polydibenzofurans, polyphthalides, polyacetals, polyanhydrides, polyvinyl ethers, polyvinyl thioethers, polyvinyl alcohols, polyvinyl ketones, polyvinyl halides, polyvinyl nitriles, polyvinyl esters, polysulfonates, polysulfides, polythioesters, polysulfonamides, polyureas, polyphosphazenes, polysilazanes, or combinations comprising at least one of the foregoing thermosetting polymers; wherein the nanosized filler consists essentially of particles having the formula (II) (MeO) x .(Fe 2 O 3 ) 100-x (II) where MeO is any divalent ferrite forming metal oxide or a combination comprising two or more divalent metal oxides, and “x” is less than 50 mole percent, wherein the nanosized filler has an average largest dimension of less than or equal to about 200 nanometers, and wherein the nanosized filler particles are used in an amount of about 2 to about 15 wt % based on the total weight of the insulating layer; and wherein the electrically insulating layer has a thickness of about 25 to about 300 micrometers and an electrical breakdown strength of greater than or equal to about 0.75 kilovolt.