A fluororesin material including a melt-fabricable fluororesin, the fluororesin material having a dielectric constant of 2.1 or less and a dielectric loss tangent of 0.00030 or less at 12 GHz. Also disclosed is a fluororesin material for high-frequency transmission including the fluororesin material and a coated electric wire for high-frequency transmission including a solid insulating coating layer made of the fluororesin material.

A halogen-free, fire resistant rubber composition for a fire resistant hose includes: 100 parts by weight of elastomer having a blend of: 60 to 70 parts of ethylene vinylacetate elastomer (EVM), a vinylacetate content of EVM being in the range from 60 to 70% by weight; 40 to 30 parts of terpolymer of ethylene, propylene, and a diene elastomer (EPDM), an ethylene content of EPDM being in the range from 30 to 40% by weight and a propylene content of EPDM being from 60 to 70% by weight; at least one fire retardant ingredient; and at least one vulcanizing agent. The vulcanizing agent is a peroxide curative.

A copolymer of ethylene with silane groups containing comonomer that is produced in a high pressure radical polymerisation process comprising the steps of: (a) compressing ethylene together with the silane groups containing comonomer under pressure in a compressor, wherein a compressor lubricant is used for lubrication, (b) polymerising ethylene together with the silane groups containing comonomer in a polymerisation zone, (c) separating the obtained ethylene from the unreacted products and recovering the separated ethylene copolymer in a recovery zone, wherein in step a) the compressor lubricant comprises a mineral oil and ethylene copolymer has a silane groups containing comonomer content of 0.5 to 3 wt % and an MFR2 of 0.3 to 10 g/10 min. The copolymer of ethylene with silane groups containing comonomer can be used.

A busbar with an insulation coating for a new energy automobile comprises a busbar body and a high-temperature-resistant insulating layer sprayed on the busbar body, and a raw material formula of the high-temperature-resistant insulating layer comprises 312% of high aluminum cement, 39% of attapulgite clay, 39% of porcelain clay, 25% of titanium dioxide, 26% of multi-walled carbon nanotubes, 26% of boron phosphate, 25% of n-methylol acrylamide, 39% of aluminum dihydrogen phosphate, 37% of tri-block copolymer styrene-butzdiene-methyl methacrylate, 37% of methylphenyl silicone resin, 37% of vinyl silicone oil, 1019% of polyvinyl acetate emulsion and balance of deionized water. The busbar of the present invention has good high temperature resistant performance and insulating performance.

An electrical device includes at least one cross-linked layer obtained from a polymer composition that has: at least one polymer comprising one or more epoxy function(s), and at least one cross-linking agent. The cross-linking agent is selected from: a non-aromatic cyclic amine, an imidazole of formula (I)

##STR00001##

where R.sub.1 and R.sub.2 independently represent a hydrogen atom or a hydrocarbon group, R.sub.3 and R.sub.4 independently represent a hydrogen atom or a hydrocarbon group, or R.sub.3 and R.sub.4 form, together with the carbon atoms of the imidazole ring to which they are attached, a ring, with the imidazole being associated with a cross-linking co-agent having at least one reactive function capable of reacting with the epoxy function of said polymer, and, a mixture thereof.

A polyolefin-and-polyvinylpyrrolidone formulation comprising (A) an olefin-based (co)polymer, (B) a polyvinylpyrrolidone (co)polymer, and (C) an antioxidant. Also a method of making the composition; a crosslinked polyolefin product made by curing the composition; manufactured articles comprising a shaped form of the inventive formulation or product; and methods of using the inventive formulation, product, or articles.

An insulated wire having an electrical wire structure capable of reducing a diameter while a direct-current stability property and a flame-retardant property are highly kept is provided. In the insulated wire including: a conductor; a flame-retardant semiconductive layer arranged on an outer periphery of the conductor; an insulating layer arranged on an outer periphery of the flame-retardant semiconductive layer; and a flame-retardant layer arranged on an outer periphery of the insulating layer, an oxygen index of the flame-retardant semiconductive layer defined by JIS K7201-2 is larger than 40, and a volume resistivity of the flame-retardant semiconductive layer defined by JIS C2151 is equal to or smaller than 5.010.sup.15 (cm).

An insulated wire having an electrical wire structure capable of reducing an outer diameter while an insulating property and a flame-retardant property are highly kept is provided. In the insulated wire including: a conductor; and a coating layer arranged on an outer periphery of the conductor, the insulated wire has a flame-retardant property that allows the insulated wire to pass a vertical tray flame test (VTFT) on the basis of EN 50266-2-4, has a direct-current stability that allows the insulated wire to pass a direct-current stability test in conformity to EN 50305.6.7, has a diameter of the conductor that is equal to or smaller than 1.25 mm, and has a thickness of the coating layer that is smaller than 0.6 mm.

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 insulated wire, having an electrical wire structure capable of reducing an outer diameter while maintaining an insulating property and a flame-retardant property, includes a conductor and a coating layer arranged on an outer periphery of the conductor. The coating layer includes a plurality of flame-retardant layers, each made of a flame-retardant resin composition, and an insulating layer interposed between the plurality of flame-retardant layers. A ratio of a thickness of the insulating layer to a thickness of the coating layer is equal to or larger than 10% and equal to or smaller than 35%.