An electric cable for high-voltage applications is disclosed which comprises a core surrounded by an electrically insulating layer made of a composition based on a thermoplastic polymeric material charged with boron nitride powder in an amount up to 20 wt % with respect to the weight of the insulating composition, the boron nitride powder having a particle size distribution D50 up 0 to 15 m. Such a cable has improved thermal conductivity property as well as good dielectric resistance and workability in particular through extrusion processes.

An insulated electric wire includes a linear conductor and one or a plurality of insulating layers formed on an outer peripheral surface of the conductor. At least one of the one or plurality of insulating layers contains a plurality of pores, outer shells are disposed on peripheries of the pores, and the outer shells are derived from shells of hollow-forming particles having a core-shell structure. A varnish for forming an insulating layer contains a resin composition forming a matrix and hollow-forming particles having a core-shell structure and dispersed in the resin composition. In the varnish, cores of the hollow-forming particles contain a thermally decomposable resin as a main component, and shells of the hollow-forming particles contain a main component having a higher thermal decomposition temperature than the thermally decomposable resin.

The invention relates to a silicone rubber composition having specific dielectric properties which can be used as insulator material in high voltage direct current applications and a method for the manufacture of cable accessories like cable joints. The invention comprises as well a method for the determination of the optimum dielectric properties and the related amount of dielectric active additives.

A resin for forming an insulating film includes at least one of a modified polyamide-imide having a terminal OH group or a terminal SH group and a modified polyimide having a terminal OH group or a terminal SH group. A varnish includes the resin for forming an insulating film and a solvent. An electrodeposition dispersion includes the resin for forming an insulating film, a polar solvent, water, a poor solvent, and a base. A method for producing an insulated conductor includes: a step of applying the varnish or electrodepositing the electrodeposition dispersion to a surface of a conductor to form a coating layer or an electrodeposition layer on the surface of the conductor; and a step of heating the coating layer or the electrodeposition layer to produce an insulating film and bake the insulating film on the conductor.

Described herein are foamable compositions and methods of making foamed compositions. The foamable composition comprises at least one polymer and a foaming agent. The foaming agent comprises a talc or a talc derivative. The polymers described herein comprise a substantially non-halogenated polymer. One or more additives are added to render the compositions flame retardant and/or smoke suppressant. Also described are Power over Ethernet (PoE) cables, having at least one electrical conduit comprising an electrically conductive core, an insulation that at least partially surrounds said electrically conductive core and a polymeric separator extending from a proximal end to a distal end and having at least one channel adapted for receiving the at least one electrical conduit. The PoE cables are capable of carrying about 1 watt to about 200 watts of power.

A thermally conductive, electrical insulating nonwoven material is described that comprises 20 wt. %-50 wt. % organic components, wherein the organic components comprise wherein the organic components comprise organic drawn fibers, organic bi-component binder fibers, and a polymer latex binder comprising at least one of an acrylic latex, an acrylic copolymer latex, a nitrile latex, and a styrene latex; and 50 wt. %-80 wt. % inorganic components wherein the inorganic components comprise a blend of thermally conductive fillers and clay. The organic bi-component binder fibers have a polymeric core and a sheath layer surrounding the polymeric core wherein the sheath layer has a lower melting point than the core.

[Problem] To provide an insulation material that has an excellent volume resistivity while retaining the balance among various capabilities including the mechanical strength, the heat resistance, the oil resistance, the bleed-out resistance, the plasticizer migration resistance, and the like, equivalent to a resin composition containing an ordinary phthalate ester. [Solution] An insulation material containing a resin composition containing: an ester (i) having one or more constitutional unit represented by the following formula (A) (wherein R.sup.1 and R.sup.2 each independently represent an alkyl group having from 1 to 4 carbon atoms); and a resin (ii). ##STR00001##

A corona shield for an electric machine, has a varnish that contains a first polymer resin, first electrically conductive particles that are dispersed in the first polymer resin, and microcapsules which are dispersed in the first polymer resin and include a second polymer resin in their interior.

There is provided an insulating material including a composite resin material comprising an organic resin and minute particles containing a metal element. The organic resin includes a resin material including polyester as a main backbone thereof and having an alkoxy group. The minute particles have an average particle size of greater than or equal to 0.5 nm but less than or equal to 50 nm. Such an insulating material is used as an insulating layer of a wiring member (wiring board, covered electric wire, etc.) including a conductor and the insulating layer which covers the conductor.

There is provided an insulating material including a composite resin material comprising an organic resin and minute particles containing a metal element. The organic resin includes a resin material including polyester as a main backbone thereof and having an alkoxy group. The minute particles have an average particle size of greater than or equal to 0.5 nm but less than or equal to 50 nm. Such an insulating material is used as an insulating layer of a wiring member (wiring board, covered electric wire, etc.) including a conductor and the insulating layer which covers the conductor.