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.

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.

The present invention is a composite stretchable film including: a surface film which is a cured product of a polyurethane 1 containing a copolymer of one or more of units a1 to a4 and silicone-pendant type urethane units b1 and/or b2 represented by the following general formula (1); and an inner film which is a cured product of a polyurethane 2 containing a unit c having polyether and urethane bonds represented by the following general formula (2), on which the surface film is laminated. The present invention provides a stretchable film that has excellent stretchability and strength, with the film surface having excellent water repellency, and a method for forming the same.

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A method for manufacturing an insulated conductive material, the method including providing a wire, applying a masking material to one or more regions of the wire, coating regions of the wire other than the one or more regions with an insulating material by, electrically charging the wire with a first charge polarity, providing a medium of electrically charged insulating material particles that are charged with an opposite polarity, passing the charged wire through the medium, whereby the insulating material particles bind areas of the conductive material other than the one or more regions, curing the insulating material particles, and applying a solvent to the masking material to thereby remove the masking material, wherein the cured insulated material particles are substantially unaffected by the solvent.

A coating mixture comprising at least one ceramic powder and a first and second binder that when applied to a substrate and heat treated produces a thin ceramic electrical insulation coating suitable for superconducting magnet applications.

The copolymerization of ethylene (E) and methoxy polyethylene glycol methacrylate (MPEGMA) produces the copolymer co-E-MPEGMA. These copolymers are distinct from polyethylene, e.g., low density polyethylene (LDPE) grafted with MPEGMA, i.e., g-E-MPEGMA, and are useful in the preparation of insulation sheaths for medium, high and extra-high voltage cables. Such cables exhibit good water tree retardance.

Provided is a composition for sealing a covered wire, the composition containing 2-cyanoacrylate including 10% by mass or more of an alkyl-2-cyanoacrylate that has, in a main chain, an alkyl group having 4 or more carbon atoms, and the composition having both water resistance and thermal shock resistance under high temperature and high humidity conditions and also having excellent heat resistance.

Provided is a direct-current (DC) power cable. Specifically, the present invention relates to a DC power cable capable of preventing both a decrease in DC dielectric strength and a decrease in impulse breakdown strength due to space charge accumulation, and reducing manufacturing costs without lowering the extrudability of an insulating layer and the like.

An organic polymeric compound called a Furuta or para-Furuta polymer is characterized by polarizability and resistivity has repeating units of a general structural formula: ##STR00001##
P1 may be acrylate, methacrylate, polypropylene, polyethylene, polyamide, polyaramid, polyester, siloxane, or polyethylene terephthalate. Tail is a resistive substitute. L is a linker group attached to an ionic functional group Q; j, a number of ionic functional groups Q, ranges from 1 to 5; n and m independently range from 3 to about 1000. Q is an ionic liquid ion, zwitterion, or polymeric acid. The number t ranges from 6 to 200,000. B is a counter ion, that can supply an opposite charge to balance a charge of the organic polymeric compound; s is a number of counter ions B. A plasticizer increases mobility of the polymers within the compound.

A processing technology of a busbar for a new energy automobile comprises the following steps: first step: punching a raw material blank of a busbar to obtain a busbar base material; second step: spraying high-temperature-resistant insulating paint on part or whole of an outer surface of the busbar base material obtained in the first step; and third step: drying to obtain a busbar. The busbar of the present invention has simple processing technology.