Abstract: A flooding compound for a waterproof communications cable is formed from a heated mixture of 92-94% by weight of a microcrystalline wax, 3-5% polyethylene and 2-4% of a rubber. The heated mixture is extruded between the plastic jacket and core sheath of a cable. The compound exhibits the adhesive and slip characteristics of, and is a replacement for, atactic polypropylene.

Abstract: A gelled oil filling compound primarily intended for optical cables which meets the standard drainage test at 70.degree. C. and is stable to prolonged exposure at -40.degree. C. consists essentially of a low aromatic hydrocarbon oil and a block copolymer with a molecular weight in the range 200,000 to 2,000,000. The block copolymer comprises at least one segment tending to confer solubility in the oil and at least one segment tending to inhabit it, the preferred example being the polymer sold under the trade mark KRATON G1651 which has a center segment which is a random copolymer of ethylene and butylene and two end segments consisting essentially of styrene units.

Abstract: A water migration resisting filler for filling the interstices of a stranded conductor, an electrical power transmission cable including such filler and a method of making such cable. The filler includes a polymeric compound having a 100 gram needle penetration value between 50 and 100 tenths of a millimeter at 25.degree. C. and particles of a water swellable material having a particle size of not greater than 200 microns are in contact with the polymeric compound either by admixing it with the compound or applying it to the surface thereof. In the method, the polymeric compound is flowed around the wires of the conductor as they are stranded together and the water swellable material is either admixed with the compound or applied thereto as the conductor is formed, a semi-conductive layer is extruded around the so-filled conductor and a layer of insulation is extruded around the semi-conductive layer.

Abstract: A corrosion-resistant electric cable has a metallic conductor, a polymeric insulating jacket surrounding the metallic conductor, and a corrosion-inhibiting powder comprised of a hydrophobic material disposed between the metallic conductor and the insulating jacket. The corrosion-inhibiting powder may be comprised of a mixture of a hydrophobic fumed silica powder and a hydrophobic polyethylene powder.

Abstract: A method of and apparatus for making the cable core of a telecommunication cable water-tight in the longitudinal direction, in which a filling material having a base of petroleum jelly is heated to a temperature above the drop point, is supplied under pressure to a filling head (5), is divided into a number of jets distributed over the circumference of the cable core, is passed through the filling head (5) with simultaneous conversion of the static pressure into kinetic energy and is injected through the outer layer of the cable core into the heart of the cable core, in which a reconversion of the kinetic energy into static pressure is effected and all the interstices and gaps between the single wires of the cable core are filled with the filling material.

Abstract: Di octyl phthalate (DOP) is used as a dielectric fluid for a-c electrical capcitors. An additive of an epoxidized linseed oil in an amount from 0.1% to 30% by weight of DOP stabilizes the capacitors and thus prolongs their life.

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 low-tack, non-cell-filling filling medium for telecommunication cables comprises 70-98% liquid base, 1-15% of a block copolymer and 1-15% of a dispersed phase former. The base may consist of a hydrocarbon or hydrocarbon mixture whose molecules are substantially incapable of diffusing into polyethylene, polypropylene or (with or without wax) other cellular insulating material at temperatures of up to 80.degree. C. or it may be a mixture of a mineral oil with a hydrocarbon or hydrocarbons satisfying the foregoing condition and also being soluble in the oil and having a low enough (number average) molecular weight to reduce significantly the osmotic pressure of the medium. The block copolymer includes at least one block tending to confer solubility in the base and at least one block tending to inhibit such solubility, so as to have a strong tendency to form a gel with the base.

Abstract: Waterproof filling medium, used in telecommunication cables with cellular insulation of polyethylene or polypropylene, is based on a mineral oil (with or without a gelling agent such as microcrystalline wax) and includes two non-polar additives. The first is soluble and of low enough molecular weight to reduce significantly the osmotic pressure of the base, but does not diffuse into the insulation below 80.degree. C.; and the second is polymeric and of high enough molecular weight to increase the resistance to flow to obtain the required non-draining property. Filling of cells in the insulation is inhibited.

Abstract: Capacitance loss is reduced in metallized film capacitors by using a cycloaliphatic epoxide as a dielectric impregnant.

Abstract: A cable fill composition comprising a paraffinic oil, a styrene-ethylene butylene-styrene block copolymer, and a linear polyethylene wax having an average molecular weight in the range of from about 1000 to 1500, whereby an improved drip point of the composition is obtained.

Abstract: A novel electrical insulating oil and oil-filled electrical appliances that are impregnated with the novel insulating oil. The electrical insulating oil is quite suitable for use in oil-filled electrical appliances in which insulating materials or dielectric materials made of plastics are employed. The electrical insulating oil comprises (a) at least one member of alkylbiphenyls and alkylnaphthalenes and (b) at least one member of monoolefins and diolefins each having two condensed or noncondensed aromatic nuclei.

Abstract: An improved transmission cable containing a filling material having superior handling and melt point characteristics useful for waterproofing telecommunication cables composed of a styrene-ethylene butylene-styrene block copolymer dissolved in petrolatum with polyethylene added for consistency and to increase the melting point of the mixture.

Abstract: An improved electrical insulating oil and oil-filled electrical appliances impregnated therewith. The electrical insulating oil is quite suitable for use in oil-filled electrical appliances in which insulating materials or dielectric materials made of plastics are employed. The electrical insulating oil comprises (a) at least one member of diarylalkanes and (b) at least one member selected from the group of mono- and/or diolefins having two condensed or noncondensed aromatic nuclei.

Abstract: There is disclosed a fluid comprising a mixture of about 5 percent to about 40 percent by volume of a halogenated benzene and about 60 percent to about 95 percent by volume of an alkyl branched chain phthalate ester, said fluid having a dielectric constant greater than the dielectric constant of either of the halogenated benzene or the alkyl branched chain phthalate ester. The dielectric constant of an alkyl branched chain phthalate ester having a dielectric constant above about 4.0 is increased by mixing a halogenated benzene having a dielectric constant above about 4.0 with the alkyl branched chain phthalate ester whereby the measured dielectric constant of the alkyl branched chain phthalate ester having the halogenated benzene therein, is at least 0.25 higher than the dielectric constant of either the halogenated benzene or the alkyl branched chain phthalate ester. The preferred halogenated benzene is trichlorobenzene, and the preferred alkyl branched chain phthalate ester is di-2-ethylhexylphthalate.

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: This invention relates to a method of producing a dam comprising the steps of exposing transmission members 4 by stripping the sheath 3 of a communication cable, covering the exposed portions of the transmission members 4 with a mold 5 and injecting self-curing resin 2 into the mold 5 to cure it. A resin which is cured while being foamed is used as the self-curing resin. The resin 2 is foamed in the mold after being injected into the mold while it is still not foamed. The resin 2 has the pressure increased by increasing the fluidity resistance of the resin 2 as it progresses to be cured when the resin 2 intrudes into gaps between the transmission members 4 within the sheath 3, which is caused by an expansion of volume of the resin 2 during foaming whereby the resin 2 is cured under a high pressure.

Abstract: A method of manufacturing a longitudinally watertight cable in which a sealing mixture of a vulcanizable silicone rubber, a diluent and a filler is provided in the cable core and between the cable core and the sheath, which mixture, after curing, forms a watertight stopper. According to the invention, a bivalent or trivalent metal salt of a higher fatty acid or a mixture of higher fatty acids is used as a filler. A sealing mixture is preferably used in the method which comprises 15-25% by weight of a multicomponent silicone rubber, 35-45% by weight of silicone oil and 35-45% by weight of calcium stearate. The sealing mixture can be provided, in a blockwise manner, by means of an injection technique.

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: Disclosed is a method of inhibiting the attack by perchloroethylene on copper and organic polymers subject to said attack, such as parylene, by adding to perchloroethylene about 20 to about 1000 ppm of a stabilizer having the general formula ##STR1## The preferred concentration of the stabilizer is about 40 to about 500 ppm. Also disclosed is an electrical apparatus containing copper or organic polymer subject to attack by perchloroethylene and perchloroethylene containing the stabilizer.

Abstract: Longitudinally water-tight cables, such as communication cables, are produced so that the interior of such cables contain a filling material which includes a water-repelling substance and relatively small diameter gas bubbles substantially uniformly embedded therein. The filling material contains an admixture of thermoplastic rubbers or rubber-like thermoplastic materials which are molten at the processing temperature utilized in the course of cable filling and which soldify at the normal operating temperature range of a cable by linking, hooking or coupling via thermoplastic blocks having a correspondingly low melting range, that is lying just below the cable filling temperature. The gas bubbles, which are generated during cable filling, are maintained at their respective spatial positions within the filling material by a rubber-like network which forms in the filling material and the linking or joining points in such network can withstand the buoyancy forces of the gas bubbles without rupture.

Abstract: Longitudinally water-tight cables, such as communication cables, are produced so that the interior of such cables have a filling material containing a water-repellant substance and relatively small diameter gas bubbles embedded in the filling material. The filling material is thickened with a reticulating thixotropic substance having a 3-dimensional network-like structure which is disruptable under mechanical influence and is regenerable over a time span in a motionless state with a significant increase of viscosity. The size of the gas bubbles are adjusted relative to the resistance to disruption of the network-like structure so that the buoyancy of such gas bubbles is significantly below such resistance to disruption in the motionless state of the filling material whereby such gas bubbles are maintained in their respective positions within the filling material in a time-stable manner during a motionless state.

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: A composition useful for filling communication cables is described which comprises petroleum jelly and a small amount of siliceous material which renders the petroleum jelly viscous at elevated temperatures, and prevents leakage of the petroleum jelly from a cable having a flaw, which is subjected to elevated temperatures; the composition is particularly useful in communication cables having cellularly insulated conductors where migration of the flowable filler composition into the cellular insulation is diminished.

Abstract: A cable filler composition comprises a mixture of mineral oil, a styrene-ethylene butylene-stryene block copolymer, and about 2-6 percent by weight of a thermoplastic polymer comprising an isotactic, crystalline polypropylene copolymer containing 0.1-4% by weight of an olefinic comonomer, the copolymer having a molecular weight of between 20,000 and 40,000.

Abstract: A cable filler composition comprises a mixture of a mineral oil, a styrene-ethylene-butylene-stryene block copolymer and 2 to 6 weight percent of an isotactic, crystalline polypropylene, the polypropylene having an average molecular weight of between 20,000 and 50,000.

Abstract: Waterproof filling medium, used in telecommunication cables with cellular insulation of polyethylene or polypropylene, is based on a mineral oil (with or without a gelling agent such as microcrystalline wax) and includes two non-polar additives. The first is soluble and of low enough molecular weight to reduce significantly the osmotic pressure of the base, but does not diffuse into the insulation below 80.degree. C.; and the second is polymeric and of high enough molecular weight to increase the resistance to flow to obtain the required non-draining property. Filling of cells in the insulation is inhibited.

Abstract: Disclosed are telephone cable filling materials and telephone cables comprised of a plurality of insulated electrical conductors twisted together to form a core in which there are a multiplicity of interstices between the insulated electrical conductors filled with the cable filler materials. The filling materials are composed of a petrolatum base material and inorganic microspheres and can be divided into two groups: (1) a first group to fill cables used at temperatures below the melting point of the petrolatum and (2) a second group to fill cables that may be used above that temperature. The first group is composed of mixtures of 40 to 90 weight percent petrolatum and 1 to 60 weight percent inorganic hollow (air filled) microspheres. When mixtures from this group are used as a filler in a telephone cable, the filler has a drip point nearly equal to the average melting point of the petrolatum, normally 57.2.degree. C. The second group is composed of two embodiments.

Abstract: The invention provides for the waterproofing of a telephone cable by the incorporation of longitudinal strands within the sheath alongside the insulated conductors. The strands have deposited thereon a moisture sensitive swelling agent, such as ethyl hydrogen cellulose, and in the event of the sheath rupturing and the conductors being exposed to moisture the swelling agent on the strands reacts with the moisture rapidly forming a plug which prevents further ingress of the moisture.

Abstract: Disclosed are materials used to fill electrical and light waveguide transmitting communications cables to make them waterproof. The filling materials have superior waterproofing, dielectric and handling characteristics and are made from compounds of styrene-ethylene-butylene-styrene, styrene-butadiene-styrene or styrene-isoprene-styrene type block copolymers dissolved in paraffinic or naphthenic type mineral oils with a minimal content of aromatic hydrocarbons, inorganic hollow microspheres and, if desired, an additive such as low molecular weight polyethylene or glycerol hydroxy stearate.

Abstract: This specification relates to a communication cable and method of making it, particularly where the cable includes a high pair count with small conductors so that the filling compound can be made to permeate to the center of the cable without having the filling compound become too viscous to reach the center of the cable when filled by the liquid filling process. The filling compound does not drip at temperatures up to 90.degree. C. From five to ten parts by weight are used of a polyethylene compound as one ingredient of the filler material. The major ingredient of the filler is a paraffinic oil which constitutes 100 parts of the filler compound. Other important considerations are to formulate the compound so that it will not permeate into the cells of the foam skin or all foam insulation.

Abstract: A void-free electrical conductor for power cables including a stranded electrical conductor formed of a central member and a plurality of abutting peripheral conducting members, the stranded conductor having a primary layer of electrical insulation heat shrunk about the exterior thereof and having an insulation material completely filling the internal space of the conductor within the primary external electrical insulation layer, the filler insulation adapted to fill all interstices between individual conducting strands outward from the abutment points between peripheral conducting members and the area inside of the abutment points being insulated by the insulation around the central conducting member to thereby form a completely void-free filling of the space within the primary electrical insulation in order to prevent the axial flow of any liquid or gaseous substance therethrough, said primary electrical insulation layer being void-free to increase the dielectric strength of the final electrical conductor c

Abstract: Insulated electrical devices protected against entry and migration of water, said electrical devices containing solid water-swellable, water-insoluble polymers prepared by crosslinking an olefinically-unsaturated carboxylic acid with an alkyl acrylate.

Abstract: An optical fiber submarine cable, in which a high viscosity material of good wettability containing air gaps is filled in a space between an optical fiber cord having housed therein at least one coated optical fiber and a pressure resisting material layer having housed therein the optical fiber cord for protecting it from seawater pressure. The air gaps and the high viscosity material are arranged alternately with each other in the space at suitable intervals in the lengthwise direction of the cable. Alternatively, the air gaps are contained in the form of bubbles in the high viscosity material.

Abstract: A cured, cross-linked, mineral oil extended polyurethane which is non-spewing. The mineral oil extended polyurethane is further characterized by being grease compatible in that the tendency of the mineral oil to migrate is substantially reduced or eliminated. The mineral oil extended polyurethane is comprised of a defined polyurethane, mineral oil, and coupling agent. In other aspects, the present invention relates to a process for reclaiming or sealing an insulated electrical device and to an insulated electrical device which is formed by such process.

Abstract: An improved filling material having superior handling characteristics and useful for waterproofing electrical cables is disclosed. The material is a styrene-ethylene butylene styrene block copolymer dissolved in a naphthenic or paraffinic oil, with polyethylene added for consistency.

Abstract: Petrolatum-based filling compounds are known to migrate into the insulation and jacket of telephone cables and to extract the stabilizers, and as a consequence, to affect the physical and/or electrical characteristics of those cable components. It does not seem possible to avoid these characteristics of petrolatum in commercial compounding operations. The filling compound of this specification is for use in telephone cables and is based on better resistance to dripping at elevated temperatures, compatibility with high density polyethylene insulation and low density and medium density polyethylene jacket compounds. It has processability at moderate elevated temperatures, resistance to cracking at room temperature and low temperatures, adhesiveness and desirable electric properties.

Abstract: An electric cable having a core made of insulated conductors disposed within a polymeric sheath. Voids within the core, between the conductors, are at least partially filled in the unused cable with a mixture comprising untreated calcium carbonate and a water-attracting polymer able to form a gel on contact with water without swelling. The cables are made waterproof by the presence of the mixture, which is cheaper than prior mixtures but as effective.

Abstract: This telephone service wire has metal conductors insulated with polyethylene plastic insulation or equivalent, assembled in a core having a flame-retardant polyvinyl chloride jacket. Space between the individual insulated conductors is filled with an improved filling compound for preventing access of water into the core of the service wire. The filler compound is an ester-based compound that avoids the disadvantages of the usual petrolatum-based filler compound which extracts not only antioxidants and copper-inhibitors from a polyethylene component but plasticizers from a polyvinyl chloride compound. Depletion of these essential compounding materials can seriously affect the physical characteristics of either the insulation or jacket of such filled telephone service wires.

Abstract: A device for filling the interstices of a multi-stranded cable with powder, comprising an outer tubular housing and a concentric inner tube with an annular chamber therebetween for moving powder filler from an inlet to the outlet end of the device. Air is deliverable under pressure to the outlet end of the device to disperse the powder as a cloud.

Abstract: A device for filling the interstices of multi-stranded cable with powder, comprising an outer cylindrical housing and a concentric inner tube with an annular chamber between them. The tube at one end carries a coaxial impeller located at the outlet end portion of the housing. Powder is fed into the chamber and a helical screw pushes the powder onto the impeller which is rotated to distribute the powder onto conductors passing from a strander around the device and into a closing die.

Abstract: A waterproof filling and flooding composition for communication cables which comprises 90% or more by weight of petrolatum, about 5-7% polybutene-1, 0.5-2.0% polyethylene and the remainder an amorphous saturated rubber such as ethylenepropylene rubber (EPR), exhibits flow resistance at temperatures of 160.degree.-170.degree. F. and even higher.

Abstract: This invention provides a method of sealing and purging contaminants from the internal free spaces of an insulated electrical device by forcing into said free spaces a low viscosity material that acts to displace fluid contaminants from within said free spaces. The material later cures in situ to form a hydrophobic seal with good electrical properties. Also disclosed herein is a method for rehabilitating waterlogged plastic insulated multiconductor communications cables of the type employed in telephone system.

Abstract: An improved filling material having superior handling characteristics and useful for waterproofing electrical cables is disclosed. The material is a styrene-ethylene butylene-styrene block copolymer dissolved in mineral oil, with polyethylene added for consistency.

Abstract: This invention provides a method of sealing and purging contaminants from the internal free spaces of an insulated electrical device by forcing into said free spaces a low viscosity material that acts to displace fluid contaminants from within said free spaces. The material later cures in situ to form a hydrophobic seal with good electrical properties. Also disclosed herein is a method for rehabilitating waterlogged plastic insulated multiconductor communications cables of the type employed in telephone systems.

Abstract: An improved watertight cable is formed by employing as a sealing composition a mixture of a vulcanizable silicone rubber and as a diluent a cycloalkyl benzene the phenyl ring of which may be chlorinated.

Abstract: A composition useful for filling communication cables is described which comprises petroleum jelly and a small amount of siliceous material which renders the petroleum jelly viscous at elevated temperatures, and prevents leakage of the petroleum jelly from a cable having a flaw, which is subjected to elevated temperatures; the composition is particularly useful in communication cables having cellularly insulated conductors where migration of the flowable filler composition into the cellular insulation is diminished.

Abstract: A method of rendering a cable having a core consisting of a plurality of conductors longitudinally watertight. A silicone rubber which vulcanizes upon exposure to moisture is used between the conductors either throughout the entire length or in blocks.

Abstract: A waterproof filling and flooding composition for communication cables which comprises 90% or more by weight of petrolatum, about 5-7% polybutene-1, 0.5-2.0% polyethylene and the remainder an amorphous saturated rubber such as ethylenepropylene rubber (EPR), exhibits flow resistance at temperatures of 160.degree.-170.degree. F. and even higher.

Abstract: An electric cable having a multi-stranded core of insulated conductors and a jacket, in which the spaces between and around the conductors are at least partially filled with a mixture which forms a blockage to the penetration of water. The mixture comprises water repellant treated calcium carbonate and high molecular weight polyacrylamide resin which do not react with each other or when in contact with water. Preferably the individual conductors are coated with a hydrophobic liquid such as a low viscosity paraffinic oil.