Abstract: A bundled conductor manufactured by bundling a plurality of small diameter conductors 1, or a bundled conductor 2 manufactured by giving an extremely rough twisting pitch, which is 20 times or more larger than an outer diameter of said bundled conductor, to the bundled conductor is formed. Then, an insulating layer 3 comprising 3 layers 3a, 3b and 3c, each comprising a heat-resistant plastic film, is arranged around the bundled conductor above. A required voltage resistance characteristics is provided and maintained by any 2 of the aforesaid 3 insulating layers, and each of the 3 insulating layers described above is independent respectively and can be separated from other ones.

Abstract: The present invention relates to an insulated wire comprising a conductor and at least two insulating layers provided on the outer periphery of the conductor. The inner insulating layer is provided directly or via another insulation on the outer periphery of the conductor and comprises a polyolefin compound containing 20 to 80 parts by weight of at least one substance selected from ethylene .alpha.-olefin copolymer, ethylene .alpha.-olefin polyene copolymer (.alpha.-olefin having the carbon numbers of C.sub.3 -C.sub.10, polyene being non-conjugated diene).

Abstract: An insulated wire comprising a conductor and an insulating coating made from a polyamideimide base coating, which polyamideimide is made of an acid component and a diisocyanate component containing 10 to 80 % by mole of an aromatic diisocyanate compound of the formula: ##STR1## or which polyamideimide is made of an diisocyanate component and an imidodicarboxylic acid that is a reaction product of an acid component and a diamine component, in which the diamine component contains an aromatic diamine compound of the formula: ##STR2## and/or the diisocyanate component contains the above aromatic diisocyanate compound in such an amount that a total amount of the aromatic diamine compound and the diisocyanate compound is from 10 to 80 % by mole based on the total amount of the whole diamine component and the whole diisocyanate component.

Abstract: Doping the jacket of a data cable reduces the bulk volume resistivity of the jacket material allowing built-up static electricity to discharge. This reduces the likelihood of static charge interfering with data transmission.

Abstract: A cable (20) which may be used for communications, for example, include transmission media (24-24), each having a plastic composition of matter disposed thereabout. The insulation (26) comprises a polyvinyl chloride composition which includes a lubricant and a lead-free stabilization system. The stabilization system includes a calcium-zinc constituent in combination with an antioxidant-metal deactivator complex which provides a sacrificial function to prevent the formation of calcium or zinc chloride which would affect adversely the electrical properties of the insulated conductor. A jacket (28) typically is disposed about a plurality of the transmission media and comprises a non-lead stabilized plastic composition of matter.

Abstract: A bundled conductor manufactured by bundling a plurality of small diameter conductors 1, or a bundled conductor 2 manufactured by giving an extremely rough twisting pitch, which is 20 times or more larger than an outer diameter of said bundled conductor, to the bundled conductor is formed. Then, an insulating layer 3 comprising 3 layers 3a, 3b and 3c, each comprising a heat-resistant plastic film, is arranged around the bundled conductor above. A required voltage resistance characteristics is provided and maintained by any 2 of the aforesaid 3 insulating layers, and each of the 3 insulating layers described above is independent respectively and can be separated from other ones.

Abstract: A flame retardant composition comprising:(i) a linear polyethylene having a density equal to or less than 0.915 gram per cubic centimeter;(ii) a linear polyethylene having a density in the range of 0.916 to 0.925 gram per cubic centimeter, grafted with an unsaturated aliphatic diacid anhydride, said polyethylene being present in an amount of about 40 to about 400 parts by weight based on 100 parts by weight of component (i); and(iii) magnesium hydroxide, surface treated with an organic phosphate ester or a salt thereof in an amount of about 0.1 to about 4 parts by weight of ester per 100 parts by weight of magnesium hydroxide, said magnesium hydroxide being present in an amount of about 90 to about 400 parts by weight based on 100 parts by weight of component (i).

Abstract: An electric cable contains a cable insulation having high resistance to the formation or growth of water trees and having high aging resistance and good processibility and consisting of an ethylene polymer and from 0.5 to 40% by weight of an ethylene copolymer ionomer which contains, in addition to predominant amounts of ethylene, a C.sub.3 -C.sub.6 -alkenecarboxylic acid or a C.sub.4 -C.sub.6 -alkenedicarboxylic acid or -dicarboxylic anhydride as copolymerized units, some of the carboxyl groups or carboxylic anhydride groups having been converted into ammonium salts of tertiary amines.

Abstract: A method and apparatus for filling a jacketed signal conduit with a blocking material are provided. The blocking material is injected into the jacketed signal conduit such that the blocking material occupies space within the jacketed signal conduit not occupied by the signal conduit. The injected blocking material inhibits fluid intrusion and migration between the signal conduit jacket and the signal conduit.

Abstract: A cross-linked polyethylene insulated cable which is prepared by extrusion coating a polyethylene composition on a conductor, the polyethylene composition comprising polyethylene, more than 10% to less than 30% by weight of an ethylene-vinyl acetate copolymer having a vinyl acetate (hereinafter referred to as VA) content of about 28% to about 33% by weight, the EVA having an average particle diameter of less than 1.7 .mu.m (average of maximum 5 values), and an organic peroxide, and thereafter cross-linking the thus coated polyethylene composition.

Abstract: A polyurethane magnet wire comprising a conductor having provided thereon a polyurethane insulation coating, wherein the total amount of the phenolic compounds contained in organic compounds which evaporate from said coating by heating at 280.degree. C. for 2 minutes is 0.2 wt % or less based on the weight of the coating and the total amount of the organic compounds is 2 wt % or less based on the weight of the coating; and an electric relay comprising such a wire.

Abstract: A non-halogenated cable for use in an electronic system having a core which includes a transmission medium, the transmission medium being a metallic or optical fiber conductor having thereon an insulating layer of non-halogenated polyethersulfone polymer composition, and a non-halogenated jacket which enclosed the core and the transmission medium, said non-halogenated jacket being a single layer of insulating material.

Abstract: A self-bonding insulated wire and a coil formed therefrom are disclosed, which wire comprising a first fusion-bonding film comprising a polyhydroxyether resin having a glass transition temperature of not lower than 90.degree. C. provided on an insulating film on a conductor; and a second fusion-bonding film comprising a polyamide copolymer resin having a melting point of from 50.degree. to 150.degree. C. provided further thereon, the second fusion-bonding film comprising the polyamide copolymer resin making up from 5% to 40% by film thickness of the entire fusion bonding films.

Abstract: An insulated wire comprising a conductor coated and baked thereon with an insulating lacquer, the insulating lacquer comprising (a) 100 parts by weight of a polyamideimide resin having a molecular weight corresponding to a reduced specific viscosity of from 0.1 to 1.0, and (b) 75 to 400 parts by weight of a stabilized polyisocyanate compound derived from diphenylmethane-diisocyanate.

Abstract: An elongate body insulated by means of an insulating covering, said covering being constituted by a tape (2) made of synthetic material taped around said body (1) and covered in a layer of varnish (11) made of synthetic material, the body being characterized in that the taping is such that there exists a groove (4) between the free edge (5) of any portion of a turn (3) that is not covered by the following turns and the uncovered surface (6) of the preceding turn, the width of said groove (4) lying substantially in the range 0% to 5% of the width of said tape (2) and being strictly greater than zero.

Abstract: Copper wire insulated with a certain copolyamide sheath is stable to high temperatures and is resistant to water crazing, cracking and loss of coating.

Abstract: A process for producing an insulated electric wire, comprising the steps of coating around a conductor an energy radiation curable resin composition having heat expansible microspheres incorporated therein, and curing the energy radiation curable resin composition thus coating on the conductor by exposure to an energy radiation. The process also comprises the step of heating the energy radiation curable resin composition to expand the heat expansible microspheres in the energy radiation curable resin composition, thereby forming a high-porosity insulation layer on the conductor. An insulated electric wire comprises a conductor; an energy radiation curable resin composition layer having microspheres incorporated therein and surrounding the conductor, the outside diameter of the microspheres in the energy radiation curable resin composition layer being maximum in the vicinity of the conductor and decreasing gradually toward the periphery of the energy radiation curable resin composition layer.

Abstract: A composition useful in the manufacture or cable comprising:(i) a copolymer comprising ethylene and one or more alpha-olefins having a density equal to or less than 0.915 gram per cubic centimeter;(ii) a metal hydrate flame retardant compound;(iii) a styrene-ethylene-butylene-styrene triblock copolymer; and(iv) optionally, an impact polypropylene copolymer or polypropylene.

Abstract: A wire construction comprising an electrically conductive core, two polymeric insulation layers and a layer of fiber braid between the insulation layers, characterized by excellent flexibility and resistance to cut-through and arc propagation.

Abstract: A process for extruding a thermoplastic polymer comprising:(a) introducing into an extruder a copolymer of ethylene wherein one of the copolymerized monomers has the following formula:CH.sub.2 .dbd.C[(CH.sub.2).sub.n --CH.sub.3 ]-Si(OR).sub.3wherein eachR is independently a saturated aliphatic group having 1 to 4 carbon atoms; andn is 0, 1 or 2;(b) extruding the copolymer of step (a); and, thereafter,(c) contacting the extrudate with sufficient moisture to effect crosslinking.

Abstract: Magnet wire substrates (1) are described having a layer of polyester tape (2) wrapped thereon, including a layer of spirally wrapped and bonded polyester insulation tape (3) as the outermost layer. The two tape layers are made up of amorphous (4) and crystalline (5) segments unbonded to the wire and bonded to each other to provide the requisite electrical properties and improved physical properties including increased flexibility and ease of strippability. A single multilayer polyester insulation tape can also be used with similar properties and reduced thickness.

Abstract: A copper alloy wire has a composition composed of no less than 0.01% by weight of Ag and balance Cu and unavoidable impurities. The copper alloy wire has been prepared by drawing a wire stock having the composition at a reduction ratio of no lower than 40% and subjecting the wire stock to heat treatment for half annealing to have a tensile strength of no lower than 27 kg.multidot.f/mm.sup.2 and an elongateion of 5%. An insulated elecric wire includes the copper alloy wire as a conductor and an insulation layer covering the wire. Also, a multiple core parallel bonded wire includes two or more such insulated electric wires bonded parallel to each other.

Abstract: This invention relates to an expandable tape for use in making cables. The expandable tape comprises a carrier material carrying thermally expanding microcapsules therein or thereon. The invention also relates to the use of the tape in the manufacture of cables, and to the cables incorporating such tape.

Abstract: Extruded shaped structures of amorphous polyarylate copolymers, having a tensile elongation at break of at least 80% at 25.degree. C., are made by drawing a molten extrudate of the copolymer at a temperature at least 100.degree. C. above the glass transition temperature of the copolymer.

Abstract: A tape-formed or sheet-formed insulating material for use in windings and coils of electrical machines includes an insulating layer in the form of a homogeneous film of an organic polymer or in the form of a felt of a paper of fibres of an organic polymer and a protective layer coated on at least one side of the insulating layer which protects the insulating layer against degradation caused by corona. The protective layer comprises an organic polymer containing at least 10 percent by volume of a powdered filler in the form of chromium oxide, iron oxide or a mixture of chromium oxide and iron oxide. The filler preferably has an intrinsic resistivity of 10.sup.4 -10.sup.8 ohm m. The thickness of the protective layer and the total thickness of the protective layer, respectively, are preferably smaller than the thickness of the insulating layer and the resistivity of the protective layer is preferably in excess of 10.sup.10 ohm m.

Abstract: A flame retardant comprising a mixture of 10 to 90% by weight of powder A and 90 to 10% by weight of powder B of magnesium hydroxide, the powder A containing 40 to 70% by weight of a powdered double salt of magnesium carbonate and calcium carbonate and 60 to 30% by weight of powdered basic magnesium carbonate; and a flame-retardant resin composition comprising 100 parts by weight of a thermoplastic resin and 30 to 300 parts by weight of the flame retardant. Preferably, the double salt is huntite, and the basic magnesium carbonate consists essentially of hydromagnesite. It is preferred to treat the flame retardant, in the form of a powder mixture, with a surface treatment agent. The flame-retardant resin composition is adapted for use as a sheath or insulation for an electric wire or cable, a fire-arresting material, or a wall material.

Abstract: A radiation-resistant high molecular composition is disclosed, charqacterized in that, to the high molecular polymer, a halogenated acenaphtylene and/or condensates thereof represented by a following general formula [I] ##STR1## (wherein, X indicates a chlorine or bromine atom, a indicates 0 to 2, b indicates 1 to 6 and n indicates an integer not less than 1) and a diphenyl ether derivative represented by a following general formula [II] ##STR2## (wherein, R.sub.1 and R.sub.2 indicate any ones of hydrogen atom, alkyl, alkoxy, phenyl phenoxy, diphenyloxy and terphenyloxy group) and/or basic lead compound are formulated.

Abstract: A solderable polyurethane wire enamel composition comprising a mixture of a blocked isocyanate and polyesterimide resin wherein the ratio of isocyanate groups in the blocked isocyanate to hydroxyl groups in the polyesterimide resin is about 0.82:1 to about 5.7:1 and the hydroxyl to carboxylic acid ratio of the raw materials used in preparing the polyesterimide is about 1.4:1 to about 2.5:1.

Abstract: An electrical cable of conductive wire having an insulating layer of expanded, microporous sintered polytetrafluoroethylene around it, followed by a coating of a vinylidene fluoride-hexafluoropropylene copolymer surrounding the insulating layer, and an outer coating of polyvinylidene fluoride.

Abstract: An electrical cable of conductive wire having an insulating layer of expanded, microporous sintered polytetrafluoroethylene around it, followed by a coating of a polyesterpolyurethane surrounding the insulating layer, and an outer film of thermoplastic polyester elastomer surrounding the coating.

Abstract: A plenum cable (20) includes a core (22) comprising at least one transmission medium such as a metallic conductor. The metallic conductor is insulated with a layer (27) of a plastic composition of material which includes a non-halogenated constituent such as, for example, a polyetherimide. Covering the insulated metallic conductor is a jacket (39) comprising a halogenated material such as a fluoropolymer. The cable exhibits excellent flame retardant properties as well as acceptable levels of corrosion and toxicity.

Abstract: An electrical conductor is provided with an electrical insulation (11) surrounding the conductor (10) and a surrounding protective layer (12) which protects the insulation against degradation caused by corona. The protective layer consists of an organic polymer containing at least 10 percent by volume of a powdered filler in the form of chromium oxide, iron oxide, or a mixture of chromium oxide and iron oxide. The filler preferably has an intrinsic resistivity of 10.sup.4 -10.sup.8 ohm m. The thickness of the protective layer is preferably smaller than the thickness of the underlying insulation (11) and its resistivity preferably exceeds 10.sup.10 ohm m. The conductor is used, among other things, in windings and coils for electrical machines.

Abstract: An electrical cable of conductive wire having an insulating layer of microporous polymeric material around it, followed by a coating of a polyesterpolyurethane surrounding the insulating layer, and an outer film of polyetherpolyurethane surrounding the coating.

Abstract: The present invention discloses a molded product which is heat-resistant, has a high elongation and is produced by a process including the steps of (1) curing a substantially linear polyarylene thioether having a melt viscosity of about 1,000 to 15,000 poise, thereby forming a polyarylene thioether resin having a melt viscosity of about 5,000 to 16,000 poise and a non-Newtonian coefficient, n, of about 1.5 to 2.1, (2) melt extruding the formed polyarylene thioether resin, (3) taking off the extruded polyarylene thioether resin at an R.sub.1 (ratio of the taking-off speed to the extruding speed at the nozzle of the melt extruded product) of about 10 to 1,000 and (4) crystallizing the taken off polyarylene thioether resin until its crystallization degree is not lower than 20 wt %; and coated electric wires having the above molded product as a coating layer.

Abstract: A polymer composition containing a polyaryletherketone and a polysulphone, where the polysulphone contains the repeating units--Ph--SO.sub.2 --Ph--Ph--SO.sub.2 --Ph--and--Ar--linked through ether linkages. The polysulphone contains 50 to 75% molar of the units --Ar--, and Ar may contain more than one aromatic group linked by aliphatic hydrocarbon groups, or by --SO--, --SO.sub.2 -- or --CO--.A composition containing a high proportion of the polyaryletherketone shows a reduced shrinkage compared to the polyaryletherketone alone. A composition containing a high proportion of the polysulphone has improved solvent resistance and stress crack resistance compound to the polysulphone alone. The composition can be used for production of film or fibre or for wire coating or may include other additives such as fillers or fibrous reinforcing agents, e.g. glass or carbon fibre.

Abstract: Flame retardant low smoke PVC-based thermoplastic compositions for use in wire insulation and cable jacketing. The compositions include poly(vinyl chloride), an additional chlorinated resin, tribasic lead sulfate, a molybdenum-containing smoke suppressing material, alumina trihydrate, a brominated aromatic ester plasticizer, at least one additional plasticizer, and at least one lubricant.

Abstract: This invention discloses a flame retardant thermoplastic polyurethane resin composition containing a halogen flame retardant and a flame-retardant, water-resistant thin insulated wire prepared by applying the flame retardant thermoplastic polyurethane resin composition to a conductor to form an insulating layer having a thickness of 0.3 mm or less. The flame retardant thermoplastic polyurethane resin composition is prepared such that 0.2 to 20 parts by weight of a cycloparaffinic compound having an epoxy group is added to 100 parts by weight of a thermoplastic polyurethane resin alone or contained as a major constituent in a thermoplastic resin.

Abstract: A flame-retardant composition is prepared by mixing 100 parts by weight of a rubber or plastics free from any halogen with about 50 to about 200 parts by weight of magnesium hydroxide having an average particle diameter of about 0.3 to about 2 .mu.m and about 5 to about 50 parts by weight of carbon black powder having an oil absorption of about 0.5 to about 2.0 ml/g, and then cross-linking the mixture with an organic peroxide, sulfur, or a sulfur compound as a vulcanizing agent. By forming an electrical insulation and/or a sheath of the flame-retardant composition, there is provided a flame-retardant cable of the type including a cable core composed of an electric conductor coated with the electrical insulation or a plurality of such cores twisted together and covered, together with a filler, with the sheath.

Abstract: This invention relates to a resin composition comprising functionalized polypropylene, a hydrogenated mono alkylarene-conjugated diene block copolymer, oil, and a filler which can be blended to form a self-extinguishing, low smoke and halogen free insulation composition which exhibits high ultimate elongation and is relatively easy to process.

Abstract: A composition suitable for use as an electrical insulation comprises a polymeric component and a water-tree retardant additive which is either an organo orthoborate of partial ester of boric acid having the formula B(OR) (OR.sup.1) (OR.sup.2) or an organo orthoborate or partial ester of boric acid with a polyhydric hydrocarbyl alcohol.

Abstract: This invention relates to a resin composition comprising polypropylene, a hydrogenated mono alkylarene-conjugated diene block copolymer, oil, and a filler which has been treated with a coupling agent, which can be blended to form a self-extinguishing, low smoke and halogen free insulation composition which exhibits high ultimate elongation and is relatively easy to process.

Abstract: Magnet wire substrates (1) are described having a layer of polyester tape (2) wrapped thereon, including a layer of spirally wrapped and bonded polyester insulation tape (3) as the outermost layer. The two tape layers are made up of amorphous (4) and crystalline (5) segments unbonded to the wire and bonded to each other to provide the requisite electrical properties and improved physical properties including increased flexibility and ease of strippability. A single multilayer polyester insulation tape can also be used with similar properties and reduced thickness.

Abstract: An optical fiber cable (20) includes a core (21) comprising at least one optical fiber (24) which is enclosed in a tubular member (34) and which includes a sheath system (40). The sheath system includes two strength members 42--42 which extend linearly longitudinally along the cable parallel to a longitudinal axis (29) of the cable. The strength members are enclosed in a plastic jacket (46). The strength members have predetermined relative tensile and compressive stiffnesses. The stiffnesses are such that the strength members are capable of withstanding expected compressive as well as tensile loading and are coupled sufficiently to the jacket to provide a composite arrangement which is effective to inhibit contraction and which controls the position of the neutral axis during bending while providing suitable flexibility.

Abstract: An organosilane of the general formula ##STR1## where R denotes a hydrogen or alkyl radical, n is 2 to 5, Ph denotes an aryl radical, and R' denotes an alkyl radical, and the hydrolysis product, a disiloxane, of said organosilanes with water, where said compounds are useful as anit-treeing additives to polyolefin.

Abstract: A moisture resistant splice assembly for communications and electrical cables is provided. The assembly employs a moisture activatable encapsulant.

Abstract: A heat-resistnat wire is disclosed which comprises a line of copper or aluminum coated with a shielding material obtained by heating a mixture of: (A) an ethylenic copolymer comprised of ethylene and 0.1 to 20.0 mol % of a monomer of at most 30 carbon atoms having an oxirane group or a hydroxyl group and having at least one double bond; and (B) an ethylenic copolymer comprised of ethylene and 0.1 to 20.0 mol % of a monomer possessing a functional group capable of reacting with oxirane group or hydroxy group in the ethylenic copolymer (A). The wire is excellent not only in heat resistance but also in insulating ability and flexibility.

Abstract: Polyolefin compounds having improved resistance to oxidation and heat aging attributable to the incorporation therein of the combination of a zinc salt of a mercaptoimidazole with a sterically hindered phenol, a method of enhancing oxidation resistance and heat aging stability by means of the incorporation of the combination in polyolefins, an electrical conductor insulated therewith and method of forming.

Abstract: The present invention provides an electrical insulating material which comprises an ethylene copolymer prepared by subjecting, to a high-pressure radical polymerization, ethylene or a mixture of ethylene and at most 3 mol % of another monomer in the presence of one- to three-ring aromatic compound having at least two carbon-carbon double bonds, which are different from each other in reactivity in radical polymerization, in one molecule at a polymerization pressure of 500 to 4,000 kg/cm.sup.2 at a polymerization temperature of 50.degree. to 400.degree. C., with the ethylene copolymer containing 0.005 to 1 mol % of a unit derived from the aromatic compound.

Abstract: Very high levels of insulation resistance and of insulation resistance stability of insulating compositions having polyolefin bases and having polar organic additives are achieved in this invention. The polar organic additives can be organic halogenated flame retardants, such as decabromodiphenyl oxide. The surprising increase in insulation resistance and in insulation resistance stability is achieved by addition of certain antioxidants in combination and, particularly, the addition of a zinc salt of mercaptoimidazole and a sterically hindered ditertiary butyl phenol. The composition may be crosslinked by radiation or even by chemical means as through use or organic peroxides without loss of the surprisingly increased insulation resistance and insulation resistance stability.

Abstract: The invention relates to electric insulation with a polyolefin base for medium and high voltage from about 10 kV up. In insulation of this type the formation of so-called water trees is to be prevented on the one hand and on the other hand, the dielectric losses are to be kept as low as possible. For this purpose it is provided that silicic acid prepared in the following manner is added to the insulation: SiO.sub.2 -containing mineral substances are melted with additions of aluminum oxide, boron oxide and carbonates and/or oxides of alkali and earth-alkali metals to form a homogeneous glass phase; from the glass melt, glass bodies with a large surface are made; the glass bodies are subjected to a leaching process with mineral acid; the porous SiO.sub.2 bodies produced are washed and dried and optionally milled. The electric insulation according to the invention is particularly well suited for use in cables and wires.