Abstract: A corona-resistant wire enamel composition is described comprising a 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 insulations for an electrical conductor employing the above composition and an electrical conductor insulated with a coating of the wire enamel composition are also disclosed.

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.

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.

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.

Abstract: Improved enamels and insulated electrical articles produced therefrom are described. The enamels are composed of solutions of curable resin which have been modified to contain nylon polymer. This polymer facilitates application of the enamel to a metallic conductor so as to produce an especially smooth and desirable insulation coating.

Abstract: Improved enamels and insulated electrical articles produced therefrom are described. The enamels are composed of solutions of curable resin which have been modified to contain nylon polymer. This polymer facilitates application of the enamel to a metallic conductor so as to produce an especially smooth and desirable insulation coating.

Abstract: Electrical coating compositions comprise blended polyesterimides and from 1 to 20 percent by weight of total solids of an ester terminated amide imide. Such compositions provide insulation coatings on electrical conductors which have superior smoothness, even after high speed coating operations.

Abstract: Electrical coating compositions comprise blended polyesterimides and from 1 to 20 percent by weight of total solids of an ester terminated amide imide. Such compositions provide insulation coatings on electrical conductors which have superior smoothness, even after high speed coating operations.

Abstract: The invention relates to polymeric coating compositions which are at least partially soluble in water and are particularly stable.Polyester, polyesterimides, polyesteramides, polyesteramideimides, polyesterhydantoins and polyester urethanes are prepared with free carboxyl or carboxylic acid groups. The carboxylic acid groups are neutralized with amine containing material, at least fifty percent excess amine being used, producing a coating composition which is at least partially soluble in water. The coating compositions are particularly useful as electric insulating coatings or wire enamels which are readily coated on a metallic or other substrate and when cured form coatings having good electrical and physical properties. They are also useful in making laminates, composites, and the like.

Abstract: Improved polyetherimide compositions and processes for their production are described. Various polyetherimide derivatives including water-soluble and tri-functionalisocyanate cross-linked resins are described. They permit production of water-based enamels and coatable particulates which may be employed in, for example, formulation of insulated electrical conductors.

Abstract: Improved enamels and insulated electrical articles produced therefrom are described. The enamels are composed of solutions of curable resin which have been modified to contain nylon polymer. This polymer facilitates application of the enamel to a metallic conductor so as to produce an especially smooth and desirable insulation coating.

Abstract: Hot-melt electrical coating compositions comprise high solids content polyesterimides prepared to an acid number of less than 6-7 in the presence of a monoether or monoester of a glycol or polyglycol and reacted hot with a blocked polyisocyanate. Such virtually solventless compositions provide insulation coatings on electrical conductors which have superior flexibility, especially after aging.

Abstract: Superior wire enamels comprise polyester imides prepared in the presence of a monophenyl ether of a glycol having a free secondary hydroxyl group and dissolved in a solvent comprising predominantly a polar oxygenated compound selected from a monoether or monoester of an alkylene, or polyalkylene, glycol. Electrical conductors coated with such enamels are also disclosed.

Abstract: Hot-melt electrical coating compositions comprise high solids content polyesterimides prepared to an acid number of less than 6-7 in the presence of a monoether or monoester of a glycol or polyglycol and reacted hot with a blocked polyisocyanate. Such virtually solventless compositions provide insulation coatings on electrical conductors which have superior flexibility, especially after aging.

Abstract: Superior wire enamels comprise polyester imides prepared in the presence of a monophenyl ether of a glycol having a free secondary hydroxyl group and dissolved in a solvent comprising predominantly a polar oxygenated compound selected from a monoether or monoester of an alkylene, or polyalkylene, glycol. Electrical conductors coated with such enamels are also disclosed.

Abstract: Polyamideimide base coating compositions having water as a solvent constituent are provided. Amine containing material is added to the polyamideimide along with water or water and a relatively small amount of compatible organic solvent to provide a composition having good coating qualities and salutary electrical insulating and physical characteristics.

Abstract: The invention relates to polymeric coating compositions which are at least partially soluble in water.Polyesterimides, polyesteramideimides, polyesterimidehydantoins and polyesterimide urethanes are prepared which have enhanced solubility in water. The reactants which form the various polymers are reacted to essentially a zero acid number with essentially no free carboxyl groups or those which are not part of the formed imide moiety or linkages. At least some of the imide rings are then cleaved or split with amine material to enhance solubility in water. The compositions are particularly useful as electrical insulating coatings or wire enamels and can also be used in preparing laminates and composites and for general coating purposes.

Abstract: The invention relates to polymeric coating compositions which are long-lived colloidal suspensions or dispersions in water.Polyesters, polyesterimides, polyesteramides, polyesteramideimides, polyester hydantoins and polyester urethanes are prepared. Amine material is added to the basic composition and reacted in such amounts that a colloidal dispersion is formed with water. The coating compositions are particularly useful as electric insulating coatings or wire enamels which are readily coated on a metallic or other substrate and when cured form coatings having good electrical and physical properties.

Abstract: The invention relates to polymeric coating compositions which are at least partially soluble in water and are particularly stable.Polyester, polyesterimides, polyesteramides, polyesteramideimides, polyesterhydantoins and polyester urethanes are prepared with free carboxyl or carboxylic acid groups. The carboxylic acid groups are neutralized with amine containing material, at least fifty percent excess amine being used, producing a coating composition which is at least partially soluble in water. The coating compositions are particularly useful as electric insulating coatings or wire enamels which are readily coated on a metallic or other substrate and when cured form coatings having good electrical and physical properties. They are also useful in making laminates, composites, and the like.

Abstract: The invention relates to polymeric coating compositions which are at least partially soluble in water.Polyesters, polyesterimides, polyesteramides, polyesteramideimides, polyester hydantoins and polyester urethanes are prepared with free carboxyl or carboxylic acid groups. At least part of the carboxylic acid groups are neutralized with amine containing material producing a coating composition which is at least partially soluble in water. The coating compositions are particularly useful as electric insulating coatings or wire enamels which are readily coated on a metallic or other substrate and when cured from coatings having good electrical and physical properties.