Corona-resistant wire enamel compositions and conductors insulated therewith
AssigneeGeneral Electric Company
InventorsJohn J. Keane, Denis R. Pauze
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Abstract
A corona-resistant wire enamel composition is described comprising a polyimide, polyamide, polyester, polyamideimide, polyesterimide, or polyetherimide resin and from about 1% to about 35% by weight of dispersed alumina particles of a finite size less than about 0.1 micron, the alumina particles being dispersed therein by high shear mixing. A method of providing corona resistant one and two-stage insulations for an electrical conductor employing the above compositions and an electrical conductor insulated with a one or two-stage coating of the wire enamel compositions are also disclosed.
Claims5
A method of providing a corona-resistant two stage insulated electrical conductor comprising:
- coating said conductor with a composition consisting essentially of a polyimide, polyester, polyamideimide, polyesterimide, or polyetherimide resin and curing said resin to form a continuous first layer around said conductor;
- and
- thereafter applying a second coating of a composition consisting essentially of a polyimide, polyamide, polyester, polyamideimide, polyesterimide or polyetherimide resin around said first layer and curing said resin to form a continuous second layer,
- wherein said first layer and said second layer are formed from a different resin and wherein either the first layer resin, the second layer resin, or both contains from approximately 1% to approximately 35% by weight of alumina particles of a size less than approximately 0.1 micron dispersed therein by high shear mixing.
Dependencies are inferred from the claim text.