Abstract: A polyvinyl chloride surface, such as plasticized polyvinyl chloride telephone cord jacket, is coated with a coating formulation comprising a medium molecular weight methyl methacrylate copolymer, cellulose acetate butyrate and a carbalkoxy benzyl phthalate plasticizer. The coating affords good adhesion, fast drying and stain resistance.

Abstract: Electric windings comprising an electric conductor and a plurality of cured insulating layers wrapping around the conductor, said cured insulating layers being obtained by bonding two or more insulating materials with a binder solution containing a mixture of a condensation polymerization type silicone resin containing hydroxyl groups in the molecule and an addition polymerization type silicone resin to form a composite insulating material, wrapping the composite insulating material around the conductor, impregnating the wrapped composite insulating material with an impregnating varnish of an epoxy-isocyanate resin and curing the impregnated composite insulating material, have excellent water resistance in addition to excellent thermal resistance, and mechanical properties.

Abstract: Cable core units comprising conductors grouped together by twisting are fed through a fluidized bed to fill voids with fluidized powder by flow of the powder between the grouped conductors. While still in the bed, the units are then deflected around rollers to cause relative displacement of the conductors which causes more complete filling of the voids with powder and powder redistribution to create uniformity of powder fill. Cable cores may also be filled with the core units closed together or separated in the bed but with units closed together when a core is deflected around the rollers.

Abstract: A process for the electrical insulation of wire by enamelling, using aqueous dispersions which are applied thereto by means of applicator rollers. The thickness of the dispersion coating on the wire can be varied by merely suitably selecting the circumferential speed of the applicator rollers.

Abstract: A substrate is plated by a process which includes the steps of catalyzing a substrate by coating its surface with a silver-pyridine complex dissolved in an organic solvent, converting the complex to silver oxide by immersion in a basic solution, and reducing the silver oxide to metallic silver and then electroless plating. When the substrate is copper, the silver oxide is spontaneously converted to a reflective and continuous layer of metallic silver upon immersion in the basic solution. The process as disclosed is used in the manufacture of insulated conductors and cord from nylon filaments.

Abstract: Anaerobic resins are cured in a gaseous atmosphere which does not contain oxygen. An insulated conductor is placed in a vacuum and is impregnated with an anaerobic resin under pressure. The conductor is then placed in a non-oxygen containing atmosphere, such as nitrogen, which cures the resin.

Abstract: A method of producing electrically insulating highly flexible and/or solderable coatings on electrical conductors or fibre materials which comprises(A) coating on said conductor or fibre material with a solution comprising:(i) isocyanates masked with compounds having reactive hydrogen atoms in the molecule and selected from the group consisting of acid amides having 1 or 2 amide hydrogen atoms, hydroxylamine, reaction products of hydroxylamine with carbonyl compounds, imines having an imine hydrogen atom, and lactams with melting or sublimation points below 25.degree. C.

Abstract: A metallic substrate and a thermoplastic resinous coating are bonded to one another by a resinous hot melt adhesive. The method of applying the coating to effect the bond includes applying to the metallic substrate a resinous hot melt polyamide adhesive composition which has been found to adhere firmly to the metallic substrate and to form a secure bond with the molten thermoplastic resin extruded onto said hot melt adhesive at high rates of speed.

Abstract: The present invention relates to a laminated insulating paper formed of cellulose paper or papers which is adhered to at least one side of cross-linked silicone grafted polyolefine film and to an oil-filled (OF) cable which insulated by the laminated insulating paper. The laminated insulating paper has outstanding peel strength as well as excellent non-solubility and anti-swelling properties in insulating oils.

Abstract: A filament served bondable conductor is described. A metal wire is wrapped with an insulating yarn then suspended between two supports. After passing over the first support, the wire is immersed in a varnish, excess varnish is removed, and the varnish is cured in an oven before the wire passes over the second support. The wire is again suspended between two more supports. After passing over the third support the wire is immersed in an enamel, excess enamel is removed, and the enamel is cured to a non-tacky B-stage in the same oven. The wire can then be wound on a take-up reel until needed. The wire can be formed into coils and the coils heated to fuse and completely cure the enamel.

Abstract: A polyvinyl chloride surface, such as plasticized polyvinyl chloride telephone cord jacket, is coated with a coating formulation comprising a medium molecular weight methyl methacrylate copolymer, cellulose acetate butyrate and a carbalkoxy benzyl phthalate plasticizer. The coating affords good adhesion, fast drying and stain resistance.

Abstract: Powder filling of a cable, or cable unit, is improved by passing the cable, or unit through a fluidized bed of powder, and vibrating or shaking the cable, or unit in a direction substantially normal to the direction of movement of the cable, or unit, through the bed.

Abstract: A coating (28) is applied over an advancing electrical conductor (21) and partially dried by exposing it to a first temperature for a predetermined time. This renders the coating substantially insoluble in water so that it is retained on the conductor as the conductor is moved through apparatus (34) which forms a ribbon (35) of pulpous material longitudinally with the conductor. The ribbon is reshaped into an insulative cover (41) concentrically disposed about the coated conductor, after which the pulp-insulated conductor is exposed for a predetermined length of time to a second temperature which is substantially greater than the first temperature. This reduces substantially the moisture content of the pulpous material and simultaneously tackifies the coating which cause the pulp insulation to have excellent crush resistance and adheres the pulp insulation to the conductor to form an insulation cover having substantial integrity.

Abstract: An aqueous coating composition containing in admixture a water soluble polyester, a water soluble orthoamic acid diamine and minor amounts of other water soluble polymeric coating materials. The water soluble orthoamic acid diamine is prepared by reacting in a suitable solvent for at least one reactant, an aromatic diamine and an aromatic dianhydride with the reactants in the molar ratio of m/(m-1) respectively, where m has a value between 2 and about 7. The diamine is dissolved in a solvent and the dianhydride is slowly added to the solution to form the orthoamic acid diamine. The reaction is carried out at a temperature below that at which imidization occurs. The reaction product may then be made water soluble by the addition of a volatile base such as ammonia or a volatile amine. Water solutions of polyester resins and the orthoamic acid diamine are utilized to produce coatings on substrates such as magnet wire.

Abstract: A coated article comprising a metal support and a baked layer of a water soluble heat-resistant insulating varnish containing a resin comprising ester groups and imide rings in the molecule dissolved in water using a volatilizable basic compound, the resin comprising the reaction product of(A) a carboxyl-containing polyesterimide resin having an acid value of about 30 to 150 obtained by reacting (a) a polyhydric alcohol component comprising at least one organic polyhydric alcohol and containing about 10 to 60 mol % of an imide ring-containing glycol of the general formula (I): ##STR1## wherein R.sub.1 is a trivalent aromatic group, R.sub.

Abstract: A method of fabricating a body having a plurality of conductors is disclosed. The method comprises forming a dielectric base which has a plurality of extensions projecting therefrom, the extensions corresponding to the desired plurality of conductors. A conductive path is then formed on each of the extensions.

Abstract: Copper based substrates for use at high temperatures in oxidizing atmospheres are made up of a copper core overlaid with a protective nickel oxide barrier layer formed in situ and an external protective layer of nickel. The process for forming the protective nickel oxide barrier layer comprises the steps of subjecting the copper core to oxidation to form a cuprous oxide surface layer over the copper core, reducing the surface of the cuprous oxide layer to regenerate copper to regain conductivity, plating a surface layer of nickel over the copper layer, and annealing the coated copper core to scavenge at least some of the oxygen from the cuprous oxide layer and react it at the interface with the plated nickel layer to form the protective nickel oxide barrier layer.

Abstract: An insulation system for electrical conductors is provided. The insulation system has a layer of polymer selected from ethylene-tetrafluoroethylene copolymer, ethylene-chlorotrifluoroethylene copolymer and ethylene-tetrafluoroethylene terpolymer surrounding the conductor. This layer of polymer is irradiation crosslinked with from 3 to 20 megarads of high energy ionizing irradiation. Bonded to the surface of the irradiation crosslinked layer of polymer is a polyimide coating. The insulation is a high temperature, flame resistant system having a combination of properties useful in the aircraft industry as airframe and hookup wire.

Abstract: A self-bonding magnet wire suitable for use in making coils, especially deflection yoke coils for television, obtained by coating and baking on a bare conductor or an insulated wire conductor an enamel comprising a polymer solution prepared by reacting two or more copolyamides, at least one of which is a copolyamide containing a nylon-12 unit in the molecule thereof, under heating in a solvent containing at least one compound with a phenolic hydroxyl group in the molecule thereof.

Abstract: Resins, made by admixing polyacrylic resin and epoxy resin in a weight ratio of polyacrylic:epoxy of 10:0.1 to 100 are cured in a diffusion gas atmosphere. An insulated conductor is coated with the polyacrylic-epoxy resin and cured without heat in a contacting gas atmosphere, such as nitrogen, carbon dioxide, argon, helium, methane, or hydrogen.

Abstract: A process for providing electrical conductors with a heat resistant, insulating coating of resin. The process comprises passing the conductors through a melt of a resin which is polyester curable through free hydroxy groups, having crosslinking equivalent weight of 400-1600, which is produced by condensation at a temperature corresponding at least to the temperature of the melt to an extent such that no substantial further condensation takes place in the melt.

Abstract: An insulated electrical conductor comprising a core carrying an inner coating of heat resistant material and a uniform outer coating of fused polymeric material forming a smooth pin-hole free surface.

Abstract: A flame retardant, flexible, solder resistant covercoat has been formulated based on dichloropropyl acrylate.

Abstract: A method of producing an insulated electrical conductor, in which a wire conductor is coated with an inner layer of heat resistant material and covered with electrostatically deposited powdered polymeric material which is fused by heat to form an outer layer of insulation. An insulated electrical conductor produced by this method comprises a core carrying an inner coating of heat resistant material and an outer coating of fused polymeric material.

Abstract: High-voltage power cables with extruded dielectric plastic insulation, installed underground, have their life shortened by the formation of electrochemical trees in the insulation. This invention provides a high-voltage power transmission cable constructed with sealant in interstices of a stranded conductor that are not filled by the semi-conducting material of a conductor shield of the cable. The construction prevents or greatly delays the formation of electrochemical trees in the insulation of the cable. The sealant prevents entrance of air into the cable at cable ends, and the passage of the humidity of the air through the conductor shield to an interface between the conductor shield and the inside surface of insulation that surrounds the conductor shield.

Abstract: A coating apparatus of die coating type for applying coating solution onto materials such as wires to be coated which includes a floating die having a hole therethrough gradually narrowing in the direction of advance of the material to be coated for allowing the material after having passed through the coating solution to pass through the die, and a thrust bearing provided with lubricating means for reducing the friction in the radial direction and disposed at the outlet side of the floating die in a direction normal to the path of advance of the material to be coated for improved follow-up performance of the floating die with respect to the lateral movements of the advancing material to obtain a uniform coating film on the material to be coated.

Abstract: There is provided a method of insulating electromagnetic coils comprising coating an electromagnetic coil with epoxy resin containing a cross linking agent consisting essentially of an acid anhydride, said coil having a bonding layer consisting of epoxy resin having a melting point of higher than 60.degree. C, and then subjecting to bridging said epoxy resin containing a cross linking agent by heating.

Abstract: A method of improving the thermal emmissivity of a cathode heater wire to allow lower temperature operation of the heater without an attendant lowering in the cathode operating temperature, in which method the surface of a tungsten or molybdenum wire is oxidized, then coated with a salt of a refractory metal, and finally heated to reduce the salt and oxide to their metallic forms thereby causing the heater wire to be roughened and darkened.

Abstract: A novel, high-flux source for use in the vapor deposition of electrode maials, such as gold, during the fabrication of precision quartz-crystal resonators, or the like. The design is based on the theory and technology of nozzle beams. The nozzle beam type source disclosed herein is conceived: (1) to permit large deposition rates with minimum wastage of electrode material; (2) to operate in high vacuum; (3) to emit vapor in a horizontal direction, thereby permitting the use of a pair of sources to plate both sides of a substrate simultaneously; and (4) to operate for extended periods of time without requiring frequent breaking of the vacuum in order to replenish the source. It is estimated that this design can operate at a deposition rate equal or above that of a conventional evaporation-type source with less than one percent of the wastage of electrode material experienced with a conventional source.

Abstract: An electrical conductor having a plurality of sides which define a generally rectangular cross-sectional configuration is coated with an electrical insulating material on all sides. An adhesive coating having a predetermined thickness and width dimension is applied to only a selected side of the conductor. The thickness of the adhesive is reduced, and the width of the adhesive coating is increased, when the conductor is wound into a coil having a plurality of turns, and the coil is heated to fuse the adhesive coating and provide an adhesive bond between the turns of the coil.

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: Disclosed is a coaxial cable having greatly improved mechanical and electrical properties derived from a foamed dielectric having a dielectric constant in the range of 1.32 to 1.1, such cable being provided by a novel method of coating a center conductor of the cable with a dielectric with an extruded cellular polyolefin base composition which has been rendered cellular by the direct injection of a blowing agent in a liquid form into the polymer during an extrusion process. Also disclosed is an apparatus and a method of continuous wire electropolishing and pre-coating.

Abstract: A process for producing thin walled coatings on elongated substrates by the electrostatic application of two superimposed layers of powder material is disclosed. The process comprises the steps of applying electrostatically a first layer of fusible powder material to an elongated substrate, at least partially fusing such first layer of powder material to provide a uniform coating on the elongated substrate, holding the at least partially fused coating at an elevated temperature below the full fusion temperature of the powder material to be applied as the second layer immediately prior to the application of such second layer, applying electrostatically a second layer of fusible powder material to the first layer, and fusing the total applied coating to achieve the desired coating thickness.

Abstract: A method of laminating a cover layer for flexible circuits which provides increased flexibility. The cover layer encapsulates a flexible circuit having a plurality of spaced conductors on a flexible insulating substrate. The cover layer is a tri-layered laminate having a first layer of insulating film, a second intermediate layer of a thermosetting adhesive, and a third layer of a phenolic resin adhesive. The cover layer is bonded to the flexible circuit with the third layer of phenolic resin adhesive being contiguous the conductors.

Abstract: A semiconductive composition having controlled strippability from cross-linked ethylene polymer based insulation compositions and comprising chlorinated ethylene-vinyl acetate copolymer containing about 3 to 40 percent by weight of chlorine and conductive carbon black.

Abstract: Electrical wire and cable suitable for use in nuclear generating stations, having at least one electrical conductor, a micaceous insulating layer surrounding the conductor and a layer of fluoropolymer insulation surrounding the micaceous layer.

Abstract: Polyalkylenetrimellitate imide polyalkylenetrimellitate ester imides suitable for use as self-bonding varnish coatings for magnet wire, which can be produced by condensation of a trimellitic acid compound, a diprimary amine, an alkanol amine and a glycol.

Abstract: A process for the electrical insulation of metallic conductors by coating wires with aqueous dispersions of coating materials, comprising the following steps which are carried out in a single cycle: introducing the starting dispersion into a storage zone A; continuously withdrawing part of the dispersion from the storage zone and feeding said part to a dispersing zone, where it is homogenized and comminuted; if necessary, cooling the dispersion to below 40.degree. C in a cooling zone; feeding the dispersion to a fractionating zone D, where it is separated into a coarse fraction and a fine fraction; and finally, passing the fine fraction through coating zones E, through which wires are drawn so as to receive a coating.

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: A method of making electric cable having a plurality of electric conductors stranded together with a deformable semi-conducting strand in each valley between the conductors and a shielding composition around and in intimate contact with the conductors and strands. The conductors and strands are stranded together into a stranding die and the plastic composition is forced around them while they are in the stranding die.

Abstract: A crosslinking composition comprising a blend of at least two polyallylic esters of polycarboxylic acids, one of said esters being a diallylic ester of an alkylene, cycloalkylene, mixed alkylene-cycloalkylene or aralkylene dicarboxylic acid, the other of said esters being a polyallylic ester of an aromatic or heteroaromatic polycarboxylic acid or triallyl ester of isocyanuric acid. The crosslinking compositions are particularly useful as crosslinking coreactants for high temperature processing fluorocarbon polymers. The products resulting from the mixing of fluorocarbon polymers and blends of diallyl esters with triallyl or tetraallyl esters are particularly useful as coatings for wire products.

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: Hot-tinned wire of copper or copper alloys is provided having a first coating of from 0.5 to 2 .mu.m thick consisting of an SnBi alloy containing 2 to 10 percent by weight Bi or of a SnNi alloy containing 0.2 to 1 percent by weight Ni, and having a second coating 1 to 4 .mu.m thick consisting of pure tin or of a SnPb alloy. The first coating acts as diffusion retarding film and retards the Cu.sub.3 Sn phase growth considerably.

Abstract: Mixtures of polyalkylenetrimellitate imides and polyalkylenetrimellitate ester imides suitable for use as self-bonding varnish coatings for magnet wire.

Abstract: Magnet Wire Bearing a Self-Bonding Poly(alkylenetrimellitate ester imide) varnish coating which is capable of forming a unitary structure after producing a fabricated article from the coated wire wherein the varnish layer bonds on heating.

Abstract: A stranded filament bundle is coated with a cross-linking plastic that contains carbon black followed by enveloping in a plastic that cross-links in the presence of moisture. The inner coating will cross-link either when the outer layer cross-links by water treatment; or by conduction of heat in the extruder for the outer layer; or by microwave heating.

Abstract: Crosslinkable ethylene-vinyl acetate copolymer resins are rendered amenable to forming adherent laminates with cross-linkable silicone rubber by admixing the ethylene-vinyl acetate resin with certain selected silanes prior to adhering the resin to the silicone rubber.

Abstract: A self-bonding magnet wire comprising a conductor and a baked mixture of nylon copolymer (A) and nylon copolymer (B) where the proportion of nylon copolymer (A) and nylon copolymer (B) is 50-95 parts of (A) to 50 to 5 parts of (B) (by weight), nylon copolymer (A) being alcohol-insoluble and non-swellable by an alcohol at room temperature and containing nylon-12, and nylon copolymer (B) having a lower melting point than that of nylon copolymer (A). Yoke coils for television sets comprising such a magnet wire and a process for forming such a magnet wire are also disclosed.

Abstract: Crosslinkable ethylene-vinyl acetate copolymer resins are rendered amenable to forming adherent laminates with cross-linkable silicone rubber by dusting the surface of either the resin or rubber, or both, with a bonding agent.

Abstract: coating compositions comprising polyalkyleneimine and cellulose acetate propionate in solution, and related process and product, are disclosed. Such compositions are particularly useful as primer coatings for substrates of regenerated cellulose, paper and paperboard where cellulose ester top coatings are used. Use of such compositions as primer coatings improves adhesion of the top coating to the substrate, particularly where the coated substrate is heat-sealed, for example, in packaging applications. Also, the coating composition provides increased resistance to blocking, which is especially important where the substrate is sheet material wound in a roll.