Abstract: A copper-type conductive coating composition which comprises:(A) a copper powder with hydrogen loss of at most 0.2% by weight or a copper powder with its oxidized surface layer removed by treatment with an organic carboxylic acid,(B) a coating binder resin, and(C) an antioxidant selected from triazoles represented by the formula: ##STR1## wherein Y is a hydroxyl group, a hydrogen atom, a C.sub.1 -C.sub.18 alkyl group or a halogen atom, and a is an integer of 1 to 3, and trithiophosphites represented by the formula: ##STR2## wherein each of R.sub.1 to R.sub.3 is a C.sub.1 -C.sub.30 alkyl group or an allyl group.

Abstract: A shielded multiconductor flexible cable for protection against EMI and/or RFI is disclosed. The shielded cable is comprised of a plurality of conductors disposed between two layers of insulating substrates, said cable having a graphic shield disposed on the exterior surface of at least one of the insulating substrate layers. The graphic shield is comprised of solidified conductive ink. Said ink provides an interference shield against EMI and RFI.

Abstract: An assembly comprising a flexible corrugated metal tube and an elongate resistive heating element that is within the tube and which can be connected to a power supply to provide an elongate electrical heater. The tube has a wall thickness less than 0.012 inch, a corrugation depth greater than 0.030 inches and a distance between corresponding points in adjacent corrugations from 0.02 inch to 0.75 inch. The corrugations extend around the entire periphery of the tube.

Abstract: A DC power cable includes a conductor and an insulation of a thermoplastic resin formed around the conductor. The insulation contains carbon black in an amount of about 0.2 to about 5% of the total weight of the thermoplastic resin and the carbon black, and the ratio of mineral oil absorption (cc/100 g) to specific surface (m.sup.2 /g) in the carbon black is not less than 0.7. The carbon black has the hydrogen content of not more than 0.6% by weight. The specific surface is measured by BET equation. The carbon black has a particle size of 10 to 100 nm.

Abstract: The invention encompasses an electric cable which is made up of a metallic shield, a semiconducting polymer sheath surrounding a cable conductor and a moistureproofing layer in the form of a semiconducting hydrophobic gel. This construction assures an effective moisture barrier between the metallic shield and the semiconducting polymer layer by providing a semiconducting gel fully compatible with both.

Abstract: A method for detecting faults in a synthetic electro-mechanical cable uses n insulated conductor dipped in a slurry of graphite prior to being overbraided with the synthetic reinforcement material. Enough graphite oozes through the braid to insure a conductive path through the multiple layers of cable on a metal take-up reel to megger the finished cable between the conductor and the metal reel.

Abstract: A high voltage coaxial cable wherein a corona-free configuration is produced by applying a room temperature-curable silicone elastomeric material under pressure to the outer surface of the cable braid so that the material is forced between the voids of the braid and adheres to the primary insulation material at the insulation/braid interface.

Abstract: An improved power cable for a heating system that utilizes the skin effect of alternating current, and a method and apparatus for joining lengths of the improved cable. In one embodiment, the cable includes a stranded copper conductor (20) surrounded by a semiconductive layer (22) formed by carbonized tetrafluoroethylene (TFE) tape which is surrounded by a primary insulation layer (24) formed by pressure extruded, perfluoroalkoxy resin (PFA), the thickness of which is determined by an equation that considers the eccentric positioning the power cable in a heat tube (14). In a second embodiment, the cable comprises a central conductor (30) surrounded by a semiconductive layer (32), followed by a primary insulation layer (34) formed by pressure extruded PFA. A shield layer (36) formed by a layer of semiconductor material (38) and several helically wrapped drain wires (40) surrounds the primary insulation layer. A protective PFA jacket (42) is pressure extruded over the shield layer.

Abstract: A semiconducting composition comprising(A) a random copolymer of propylene and an alpha-olefin having at least 4 carbon atoms as main constituents, which contains 50 to 87 mole % of the propylene units,(B) fine particles of carbon black, and as an optional component,(C) at least one random copolymer selected from the group consisting of a random copolymer of ethylene and a vinyl ester having 4 to 5 carbon atoms as main constituents, which contains at least about 5.4 mole % of the vinyl ester units, and a random copolymer of ethylene and an unsaturated carboxylic acid ester having 4 to 8 carbon atoms as main constituents, which contains at least 3 mole % of the unsaturated carboxylic acid ester units.The semiconducting composition or its crosslinked product is useful as an outside semiconducting layer in a power cable composed at least of a central conductor, a crosslinked polyethylene insulating layer surrounding the conductor and an outside semiconducting layer surrounding the insulating layer.

Abstract: RF absorbing magnet wire is disclosed made up of an electrical conductor such as copper or aluminum coated with at least one layer of polymeric insulation containing electrically and/or magnetically conductive particles. The wire may be made up of a plurality of insulating layers with the particles in the outermost layer. Such magnet wire will aid in eliminating RF interference where certain RF sensitive components, i.e. microprocessors, radios, etc. may be affected.

Abstract: Semi-conductive compositions, based on ethylene-vinyl acetate copolymers or chlorinated products thereof, containing carbon black, a silicone compound and an interface crosslink inhibitor, such as a phenol, a quinone, a thiazole or a thiuram sulfide, which find utility as semi-conductive layers about crosslinked polyolefin substrates of electrical conductors.

Abstract: A low mechanical noise coaxial cable for suppressing noise due to mechanical movement of the cable wherein the cable includes a central conductor, a dielectric surrounding the conductor, electrical shielding embedded in conductive material surrounding the dielectric and preferably, jacketing structure holding the above recited elements in place.

Abstract: A direct current electric cable has its conductor insulation formed by winding a tape of a biaxially oriented polymer provided on at least one face with a film of water-repellent grease.

Abstract: An arrangement for detecting an underground continuous length item includes an electrically conductive wire constituted by covering a flexible metallic core wire with an outer coating layer made of a flexible and electrically conductive high polymeric organic material. The electrically conductive wire is positioned under the ground along the underground continuous length item and is supplied with a high frequency current. Electromagnetic waves are emitted from the wire therefrom for detecting the location of the underground continuous length item located underground. Since electric current is propagated through the ground via the coating layer of the wire upon supply of high frequency power to the wire, whereby it becomes possible to detect from the ground surface the location of the continuous length item located underground in the case where the wire is cut.

Abstract: An improved power cable for a heating system that utilizes the skin effect of alternating current, and a method and apparatus for joining lengths of the improved cable. Lengths of the improved cable are joined by first removing predetermined portions of the insulating and semiconductor layers from a terminal end (50) and a feed end (52) of respective cable lengths. The exposed conductors (30') are mechanically joined and covered by a spirally wrapped carbonized TFE tape (60). An insulating layer (62) is formed over the junction by spirally wrapping uncured, nonadhesive tetrafluoroethylene tape with a 50% overlap and then heat fusing the layer. Shield extensions (66), (68) are formed by spirally wrapped, carbonized TFE tape that extend into noncommunicating, isolated overlapped relationship from the respective shield layers (38) of each cable end. The entire splice is covered with a layer of insulation (73) formed by uncured, nonadhesive TFE tape which is subsequently heat fused.

Abstract: A semiconductor packing substance for an undersea cable transporting electrical power, said cable having a core made of conductors 1 disposed axially, surrounded by a polyethylene layer 3 which is made semiconductive, then by a layer of insulating polyethylene (4). The packing substance is obtained by reticulating liquid nitrile rubber with carboxylic bonds and an epoxy resin to both of which is added a carbon black with a specific surface area at least equal to 100 m.sup.2 /g, an anti-oxidizing agent and a reticulation accelerator.

Abstract: A direct current, electric, submarine cable which may be used in long lengths and at great depths and which has improved voltage breakdown characteristics with respect to voids which form in the insulation. The cable has a conductor surrounded by an inner semi-conductive screen which is surrounded by cellulose paper tape insulation which is surrounded by an outer semi-conductive screen which is surrounded by a metal sheath. The paper tape is impregnated with a compound comprising a viscous hydrocarbon oil containing a substance having polar groups, the amount of the substance being sufficient to make the volume resistivity of the compound 100 times lower than the volume resistivity of the tape with the compound therein.

Abstract: A semiconducting resin composition comprises: (A) 100 to 40 parts of a modified ethylene-vinyl acetate copolymer prepared by graft processing of 100 parts of an ethylene-vinyl acetate copolymer of a vinyl acetate content of less than 35 percent with 25 to 200 parts of an aromatic vinyl monomer; (B) 0 to 60 parts of a rubber; and (C) 3 to 150 parts of a carbon black with respect to 100 parts of the above described components (A) and (B), all quantities in "parts" and "percent" being by weight. A composition of this character has excellent characteristics for its use in forming the outer semiconducting layer of polyethylene-insulated cables.

Abstract: A process for producing a crosslinked polyethylene insulated cable having an outer semiconductive layer which comprises providing an internal semiconductive layer, and an electrically insulating layer on an electrical conductor in conventional manner, coating by extrusion a resin composition comprising 100 parts by weight of an ethylene/vinyl acetate copolymer having a vinyl acetate content of at least about 55% by weight and about 5 to about 100 parts by weight of carbon black and a crosslinking effective amount of a crosslinking agent on said electrically insulating layer and heating said coated composition to at least about 230.degree. C. to crosslink said resin composition is disclosed. This process assures high production speed.When the ethylene/vinyl acetate copolymer used has a vinyl acetate content of at least about 80% by weight the outer semiconductive layer can easily be peeled off by hand.

Abstract: An improved sheathed cable and method for producing same is described. The cable includes an inner insulated conductor/conductor group, an outer corrugated metal sheath, and a barrier layer of a pliable, inert sealing material disposed therebetween to prevent the passage of gas or vapors via the cable. The method includes the steps of applying the pliable material around the inner insulated conductor/conductor group, wrapping the pliable material with a flexible tape, forming an outer metallic sheath around the material, and making annular corrugations in the outer sheath so as to compress the sealing compound.

Abstract: An electric high voltage cable in which the insulation sheath of the current-conducting cores is provided over the entire cable length on the side remote from the core with a coating of SiC particles embedded in the insulation coating and constituting a voltage-dependent resistive coating.

Abstract: A shielded wire in which an insulation layer covered wire and a ground wire are both covered with a conductive material layer. The ground wire is covered, furthermore, with a conductive high molecular material layer. The latter and the conductive material layer are in mutual contact so that they are mechanically separable from each other and are, at the same time, electrically connected to each other. The conductive high molecular material layer may be made of conductive synthetic resin such as conductive polyvinyl chloride and the like, or of conductive rubber. The conductive material layer may also be made of the latter materials, as well as of metal.

Abstract: There is provided an insulated high voltage cable which possesses the property of lower dielectric losses than prior art cables. The cable comprises a conductor insulated with at least two laminar layers of insulating material. At least one of the layers is relatively thick and has a low SIC. At least one other of the layers has a high SIC and is in contact with a surface of the low SIC layer. The high SIC layer is relatively thin and has a tan .delta./SIC value no greater than 0.005 over a temperature range of 40.degree. to 90.degree. C.

Abstract: An insulated cable core is provided with a shield made of individual wires which are embedded in a first plastically deformable jacket which carries a water vapor impermeable sleeve made of wrapped or folded metal or metallized foil or ribbon whose adjoining edges are sealed. This sleeve carries a second plastically deformable jacket to be embedded in-between two such jackets. The usual protective covering is provided around the outer deformable jacket.

Abstract: Insulation for an electric power cable, and a power cable including such insulation, the insulation having an improved dielectric strength and being irradiation cross-linked polymeric material having mixed therewith carbon black having a particle size in the range from about 200 to about 500 millimicrons, the carbon black content being about 10% to about 40% of the weight of the mixture of carbon black and the polymeric material. Also, the cable insulation may be layers of different density polyethylene, at least one of the layers being the described mixture of polyethylene and carbon black.

Abstract: A composite reinforced hose for conveying paint under pressure is provided with a core tube simultaneously coextruded from two or more thermoplastic synthetic polymers which are in intimate contact with each other. The inner layer of the core tube is nylon or other chemical resistant polymer which is substantially non-conductive and the outer layer is electrically conductive. The conductive polymer layer serves as a ground for static electricity.

Abstract: Disclosed is an apparatus and method for extruding primary insulation and insulation shielding onto an advancing shielded conductor strand in one operation without causing inward protrusions of insulation shielding compound particles into the primary insulation comprising an extruder head with a starter tip, an antiprotrusion tip and a die.

Abstract: A high voltage cable which has a composite jacket having inner and outer parts. A corrugated moisture barrier is sandwiched between the parts and bonded to them. The jacket prevents both radial and longitudinal flow of moisture in the cable. The moisture barrier may serve as a return conductor or the jacket may include additional return conductors.

Abstract: An insulation of cross-linked polymer is extruded about a cable conductor and cross-linked by means of heating in a vulcanization tube. The heating is effected by radiation energy, at least the main part of the radiation having wavelengths between 0.76 .mu.m and 4 .mu.m and a tube which is permeable to the radiation being used as vulcanization tube.

Abstract: Sealed power cables (e.g. for underground or submarine use) are often equipped with a metal sheath. A problem with some such cables is that their insulation is subject to greater thermal expansion of the cable during use than the metal sheath is capable of following. According to the present invention the metal sheath (5) is longitudinally corrugated either when the metal sheath is manufactured or by pressing a metal sheet which is originally plane over resilient ribs disposed longitudinally on the cable.

Abstract: A conductive coating is disclosed, the coating comprising conductive particles, at least one surfactant, a thixotropic gelling agent, and, optionally, an organosilane coupling agent and a defoamer. The coating is suitable for use as a slip coating, which coating is particularly suitable for use in the production of conductive cores employed to produce electrical cables.

Abstract: A fibrous reinforced flexible hose for conveying fluids such as paint under pressure is provided with a composite core tube preferably simultaneously co-extruded from two or more synthetic polymers which are in intimate contact with each other. The inner layer of the composite core tube is nylon or other chemical resistant polymer which may or may not be cross-linked and the outer layer is a cross-linked electrically semi-conductive synthetic polymer layer which serves as a ground for static electricity. In the process of making the hose, the semi-conductive layer is preferably cross-linked by irradiation as a means of improving its higher temperature performance capabilities and to minimize changes in the electrical resistance of the semi-conductive layer that might arise from dynamic use of the hose.

Abstract: The mending of defective semiconductive components of insulated electrical cable, comprising filling and sealing voids or breaks within a body of semiconductive material with a curable semiconductive patching compound comprising the combination of chlorosulfonated polyethylene, conductive filler and lauroyl peroxide, and heating the patching compound to cure the same.

Abstract: Vulcanizable semi-conducting compositions that can be used to provide strippable insulation shielding compositions for electrical conductors, and articles of manufacture wherein the crosslinked product of said vulcanizable compositions are directly bonded to a crosslinked polyolefin substrate.

Abstract: A shielded ultra-miniature cable suitable for example to provide low voltage connections, the cable including one or more low voltage conductors surrounded by an insulation coating, the insulation coated conductors being surrounded by a semiconductive coating providing a ground shield. The insulation and semiconductive coating are formed from thermoplastic materials of limited thickness to permit soldering of said shielded cable without requiring prior removal of said semiconductive and insulation coatings and to maintain minimum dimensions for the cable.

Abstract: A semi-conductive coating for glass fibers is disclosed, the coating comprising at least one polyacrylate emulsion, a conductive carbon black dispersion and a thixotropic gelling agent. The coating being suitable for application to glass fiber roving employed to produce electrical cables.

Abstract: A composite of polymeric materials which are adheringly joined to each other and which can be easily and cleanly separated by stripping apart with a low pulling force whereupon the contacting surfaces of their interface separate cleanly without retention of any residue on one from the other, and which comprises the combination of a previously cured body of a copolymer of ethylene and propylene adjoined to a subsequently cured body of an elastomeric blend of a copolymer of ethylene and propylene admixed with chlorosulfonated polyethylene. The combination of materials is especially advantageous when used in electrically conducting wire and cable constructions as a composite of an electrical insulation and an overlying strippable semiconductive layer.

Abstract: Insulated electric power cables comprising a cured insulating material applied over a conductor and a layer of plastic compound comprising 100 parts by weight of a thermoplastic resin and 5-70 parts by weight of calcium oxide as a moisture-absorbing agent, overlying the insulating material and, optionally, lying between the conductor and the insulating material. The presence of calcium oxide serves to absorb steam before it penetrates into the insulating material through the layer of plastic compound being cured by steam, whereby the cured insulating material is free of microvoids and possess good insulation characteristics.

Abstract: In a power cable including a central conductor, an extruded inner conductor surrounding the conductor, an inner layer of extruded insulation surrounding the inner conducting layer, an extruded outer conducting layer surrounding the extruded insulation, a metal shield surrounding the outer conducting layer and an outer insulating sheath surrounding the metal shield, an intermediate insulating layer having a mechanical peel strength lower than that of the outer conducting layer and of the inner insulating layer is interposed between the inner insulating layer and the outer conducting layer to permit the outer insulating layer, metal shield and outer conducting layer to be easily peeled away from the inner insulating layer without damage to the outer conducting layer and without leaving a conducting residue on the inner insulating layer.

Abstract: According to the invention electrically conductive paths are provided between the coil armor and the core laminations of dynamoelectric machines by placing a semiconducting elastomeric material between the coil sides and the walls of the core slots. The elastomeric material is of a type which has a controlled resistance and will deform sufficiently under pressure to flow into the irregularities between the coil side and the slot walls, and in so doing provide conductive paths for electric charge to flow from the armor to the core laminations. This material must be capable of retaining its strength, elasticity, conductivity, etc., and remaining in place between the coils and core under vibration, coolant flow, electric stresses, repeated temperature changes, etc., for the operating life of the machine. Preferably, these paths will be heat conductors as well.

Abstract: The disclosed conductor includes a core, having a plurality of conductive glass fibers, an overwrap of non-conductive glass strands wound under tension around the core and a semi-conductive overcoat, preferably of polytetrafluoroethylene having suspended therein conductive powders, and silica. The overwrap includes distinct windings, rather than a braid, which securely retains the fibers in a cylindrical core of uniform cross-section.

Abstract: A deformation resistant semi-conducting composition is formed from low density thermoplastic ethylene copolymer, carbon black, thermoplastic crystalline high density ethylene polymer or propylene resin and a thermoplastic elastomer.The composition is useful as insulation shielding material or as conductor shielding material in high voltage wire and cable.

Abstract: Extruded dielectric power cables installed underground have their life shortened by the formation of electrochemical trees in the insulation. Tree formation can be prevented if the insulation is initially dry and the cable construction is such that moisture cannot gain access to the insulation under operating conditions encountered during installation and underground use. This invention eliminates initial moisture and has a construction that greatly retards ingress of moisture to the insulation during installation when the cable is in service and prevents longitudinal movement of water along the cable due to accidental damage to the cable or electrical failure.

Abstract: This electrostatic shielding tape is a metal strip of low resistance and low reactance folded longitudinally over the length of an insulated power cable having a semi-conducting insulation shield surrounding its insulation. The longitudinally folded metallic tape has its edges free to permit expansion of the insulation and insulation shield, located directly under it, without significant deformation of the insulation and the insulation shield. When the tape is of a metal requiring a thin corrosion-protective coating, the coating on the side adjacent to the insulation shield is preferably semi-conducting to accept charging current from the insulation shield. It is a feature that the metal of the electrostatic shield is in electrical communication with the insulation shield. .Iadd.