Provided are a core electric wire for multi-core cable that is superior in flex resistance at low temperature, and a multi-core cable employing the same. A core electric wire for multi-core cable according to an aspect of the present invention comprises a conductor obtained by twisting element wires, and an insulating layer that covers an outer periphery of the conductor, in which, in a transverse cross section of the conductor, a percentage of an area occupied by void regions among the element wires is from 5% to 20%. An average area of the conductor in the transverse cross section is preferably from 1.0 mm.sup.2 to 3.0 mm.sup.2. An average diameter of the element wires in the conductor is preferably from 40 m to 100 m, and the number of the element wires is preferably from 196 to 2,450. The conductor is preferably obtained by twisting stranded element wires obtained by twisting subsets of element wires. The insulating layer preferably comprises as a principal component a copolymer of ethylene and an -olefin having a carbonyl group.

An insulation or jacket layer for a coated conductor is composed of (A) a crosslinked silane-functionalized polyolefin, (B) a filler, (C) a reactive branched polysiloxane, and (D) from 0.00 wt % to 20 wt % of a silanol condensation catalyst.

Disclosed is an ultra-high-voltage direct-current power cable that is capable of simultaneously preventing or minimizing field enhancement and reductions in high-temperature volume resistance and direct-current dielectric strength due to accumulation of space charges in an insulator.

A copolymer having tetrafluoroethylene units and units independently represented by formula (I) in a range from 0.02 to 2 mole percent, based on the total amount of the copolymer. Rf is a linear or branched perfluoroalkyl group having from 1 to 8 carbon atoms and optionally interrupted by one or more O groups, each n is independently from 1 to 6, m is 0 or 1, and z is 0, 1, or 2. The copolymer has a melt flow index in a range from 20 grams per 10 minutes to 40 grams per 10 minutes and has in a range from 2 to 200 SO.sub.2X groups per 10.sup.6 carbon atoms and up to 100 unstable end groups per 10.sup.6 carbon atoms. The copolymer can be extruded to make articles, such as insulated cables. A method of making the copolymer is also disclosed. ##STR00001##

A wire cable comprising a ground conductor and an insulated conductor wherein the insulated conductor comprises a metal conductor, an insulated material surrounding the metal conductor, and a nylon jacket surrounding the insulated material. A binder surrounds the ground conductor and the insulated conductor and a jacket surrounds the binder.

An electrical wire includes a metal conductor and an insulation layer. A wire diameter of the metal conductor is 0.20 mm or smaller. The insulation layer covers the metal conductor. The insulation layer includes an ultraviolet-crosslinkable resin composition containing 80% by mass or more of a thermoplastic resin. The ultraviolet-crosslinkable resin composition desirably contains, relative to 100 parts by mass of the thermoplastic resin, 0.5 parts by mass or more and 5 parts by mass or less of a photoradical generator, and 1 part by mass or more and 15 parts by mass or less of a reactive monomer.

The present invention relates to a cable, suitable for both electrical and data transmission, comprising at least one shield layer, comprising a metal layer directly adhering onto the polymeric layer.

The direct-current cable includes a conductive portion; and an insulating layer covering an outer periphery of the conductive portion, the insulating layer containing cross-linked base resin and inorganic filler, the base resin containing polyethylene, a BET specific surface area of the inorganic filler being greater than or equal to 5 m.sup.2/g and less than or equal to 150 m.sup.2/g, and a mean volume diameter of the inorganic filler being less than or equal to 1.0 m, the mass ratio of the inorganic filler with respect to the base resin being greater than or equal to 0.001 and less than or equal to 0.05, and the cross-linked base resin being cross-linked by a cross-linking agent containing organic peroxide.

An opto-electrical cable may include an opto-electrical cable core and a polymer layer surrounding the opto-electrical cable core. The opto-electrical cable core may include a wire, one or more channels extending longitudinally along the wire, and one or more optical fibers extending within each channel. The opto-electrical cable may be made by a method that includes providing a wire having a channel, providing optical fibers within the channel to form an opto-electrical cable core, and applying a polymer layer around the opto-electrical cable core. A multi-component cable may include one or more electrical conductor cables and one or more opto-electrical cables arranged in a coax, triad, quad configuration, or hepta configuration. Deformable polymer may surround the opto-electrical cables and electrical conductor cables.

Provided are an insulated electric wire including an insulating coating made of a resin composition with high wear resistance, and a wire harness including the insulated electric wire. An insulated electric wire 10 includes an electric wire conductor 12, and an insulating coating 14 that coats the outer circumferential surface of the electric wire conductor 12, wherein the insulating coating 14 is made of a resin composition containing a thermoplastic polyurethane elastomer as a main component. Furthermore, a wire harness includes the insulated electric wire 10. The thickness of the insulating coating 14 is preferably less than 0.7 mm.