US3793476A - Insulated conductor with a strippable layer - Google Patents

Insulated conductor with a strippable layer Download PDF

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Publication number
US3793476A
US3793476A US00336146A US3793476DA US3793476A US 3793476 A US3793476 A US 3793476A US 00336146 A US00336146 A US 00336146A US 3793476D A US3793476D A US 3793476DA US 3793476 A US3793476 A US 3793476A
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weight
parts
ethylene
propylene
admixed
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US00336146A
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T Misiura
J Vostovich
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Vulkor Inc
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General Electric Co
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Assigned to VULKOR, INCORPORATED, A CORP. OF MA reassignment VULKOR, INCORPORATED, A CORP. OF MA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: GENERAL ELECTRIC COMPANY, A CORP. OF NY
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/308—Wires with resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a general shape other than plane
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
    • H01B7/18—Protection against damage caused by wear, mechanical force or pressure; Sheaths; Armouring
    • H01B7/187—Sheaths comprising extruded non-metallic layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients
    • H01B9/027—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of semi-conducting layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
    • Y10T428/24851—Intermediate layer is discontinuous or differential
    • Y10T428/2486—Intermediate layer is discontinuous or differential with outer strippable or release layer

Definitions

  • 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 from the other, and which comprises the combination of a body of ethylene polymer adjoined to a body of an elastomeric blend of polymers comprising ethylenepropylene rubber admixed with a chlorine containing rubber.
  • the combination of materials is especially advantageous when used in wire and cable constructions as a composite of an electrical insulation and an overlying strippable semiconductive layer.
  • a common typeof construction for electrical wires or cables designed for medium to high voltage applications, for example about to 35 KV, as well as other classes of electrical service, comprises combinations of one or more insulating layers and semiconductive layers.
  • the metallic conductor may be provided with an organic polymeric insulation such as crosslinked polyethylene, and an overlying body of semiconducting material comprising an organic polymeric composition which has been rendered electroconductive by the inclusion therein of electrical conductivity imparting agents or fillers such as carbon black.
  • these cable constructions may vary in certain elements, and often include an intermediate component disposed between the metallic conductor and the primary body of dielectric insulation such as a layer of separating tape or inner layer of semiconductive material, or are enclosed within protective covering sheaths, all such cable constructions conventionally include therein at least a body of primary insulation surrounding the conductor with an overlying body of semiconducting material in physical contact with the insulation.
  • this arrangement of a layer of insulation with a superimposed layer of semiconductive material thereover incurs certain handicaps.
  • U.S. Pat. No. 3,677,849 deals with this problem of intermediate void spaces at the interface of the insulation and semiconductive material by applying a heat treatment to the assembled product to induce a shrinkage of the semiconductive material tightly about the insulation.
  • U.S. Pat. No. 3,259,688 proposes a different solution to this problem comprising a distinctive construction and an irradiation treatment.
  • the insulation layer and overlying semiconductive layer for electrical cable can be formed concurrently about the wire or 'metal conductor by means of a continuous simultaneous extrusion process with one extruder, or these layers are formed in sequence employing tandem extruders, and both layers are thereafter cured at the same time in a single operation and unit to minimize manufacturing steps and apparatus.
  • the simultaneous curing of both layers together, or even the curing of only one layer alone while it is in a contiguous arrangement with the other can result in the apparent formation of crosslinking bonds bridging across the interface between the adjoining surfaces of each phase.
  • This invention comprises a combination of specific organic polymeric materials, and a composite costruction formed therewith wherein two phases or bodies are adheringly united with each other at their abuttingsurfaces to provide a substantially continuous and secure union of their contacting surfaces extending over their common interface and thereby effectively obviating the occurrence of intermediate void spaces, while at the same time providing an interface union between the phases which is easily separated with a relatively small pulling force whereupon the components part with clean surfaces each free of any residue from the other.
  • the invention includes the combination of a first body of ethylene polymer with a second body composed of an elastomeric blend of a minor portion of ethylene-propylene rubbers admixed with a major portion of a chlorine containing elastomer comprising polychloroprene rubber (neoprene), or chlorosulfonated polyethylene rubber (Hypalon).
  • compositions and their attributes of this combination are uniquely suitable and advantageous for use in the construction of electrical wires and cables in the function of a composite insulation of ethylene polymer with an easily and cleanly strippable semiconductive material superimposed over the insulation when the polymeric material comprising the said elastomeric blends is rendered suitably electroconductive by appropriately filling with a typical electrical conductivity imparting agent or filler such as carbon black dispersed therethrough, or some other electrically conductive particulate material such as silicon carbide, iron, aluminum, etc., in such amounts so as to impart the desired degree of conductivity.
  • a typical electrical conductivity imparting agent or filler such as carbon black dispersed therethrough, or some other electrically conductive particulate material such as silicon carbide, iron, aluminum, etc., in such amounts so as to impart the desired degree of conductivity.
  • FIG. 1 comprises a perspective view of a portion of an insulated conductor having a semiconductive shield thereon;
  • FIG. 2 comprises a cross-sectional view of the insulation and overlying semiconductive layer about a portion of metallic conductor.
  • the invention specifically consists of a novel combination of given polymeric materials, or combined bodies composed thereof, which provide unique interfacial characteristics when their contiguous surfaces are adheringly joined together by curing the polymeric material of at least one of the combined bodies.
  • Polymeric materials of the invention comprise for the one phase, a body or unit of ethylene polymer, and for the other phase of the composite, a body'or unit of an elastomeric blend consisting of about 20 to 45 parts by blends for electrical insulating materials for wire and cable are disclosed in theabove'mentioned U.S. Pats.
  • preferably preferablyconsists of about to 45 parts by weight of ethylene-propylene copolymer or terpolymer rubber substantially homogeneously admixed or blended with about 55 to 75 parts by weight of polychloroprene, or alternatively about 25 to 40 parts by weight of the ethylene propylene copolymer or terpolymer rubber substantially homogeneously admixed or blended with about 60 to 75 parts by weight of chlorosulfonated polyethylene.
  • the terpolymers of ethylene-propylene include commercially available rubbers produced by I the copolymerization of ethylene and propylene toweight of ethylene-propylene copolymer or terpolymer rubbers admixed with about to 80 parts by weight of a chlorine containing elastomer of either polychloroprene rubber or chlorosulfonated polyethylene rubber. Accordingly for the purposes of this disclosure and claims, the term copolymers of ethylene and propylene includes terpolymers of such monomers.
  • the ethylene polymer of one phase of the combined polymeric bodies includes polyethylene, a common and extensively used electrical insulation material for wire and cable, which is cross-link cured to a thermoset state in keeping with the requirements of the invention. Also included are similar compolymers of ethylene and other polymerizable materials, and blends of such polymers and copolymers which are at least predominately composed of ethylene and are known in the art to provide effective cross-link curable electrical insulations. For example, copolymers of ethylene and vinyl acetate and similar copolymers wherein the ethylene content is a majority of more than 50 percent by weight, and preferably at least about 75 percent by-weight of ethylene content.
  • the terpolymers of ethylene-propylene with dienes give greater latitude in the available curing systems in relation to the copolymers of only ethylene and propylene.
  • the copolymers require a free radical curing mechanism as provided by a peroxide compound, whereas the terpolymers with this additional unsaturated radicals can also be cured with a conventional sulfur-accelerator curing system, as well as with a peroxide free radical system.
  • the elastomeric blends can be easily rendered electroconductive to any appropriate degree desired by the filling or inclusion therethrough of a suitable amount of an electrical conductivity imparting agent such as about 15 to parts of carbon black or metal particles by weight of the polymeric ingredients according to conventional practices.
  • the elastomeric blend When aptly rendered electroconductive with a suitable amount of a conductive material, dispersed therethrough, the elastomeric blend can fulfill the required electrical functions of a semiconducting material in electrical cable, and when combined with an ethylene polymer insulation and cured inaccordance with this invention, it pro vides the unique interfacial properties which effectively eliminate the occurrence of intermediate void spaces between the interface surfaces of insulation and semiconductive materials and also enables an easy and clean separation of the semiconductive material from the insulation.
  • each phase of the combination of this invention both ethylene polymers and the elastomeric blends
  • a peroxide forming free radical according to conven' tional practices such as described in US. Pats. Nos. 2,888,424 and 3,079,370, and subsequent relevant prior art.
  • other curing systems or means known to the art or prescribed by the polymer manufacturers or suppliers can be applied, such as the use of sulfur based system with terpolymers of ethylene and propylene.
  • a tertiary peroxide such as a dicumyl peroxide
  • ther the ethylene polymer or the elastomeric blends undergoes curing while the surface thereof is in intimate physical contact with the surface of the other polymeric body or phase whereby the curing mechanism of one phase can effect the apparent cross-linking bonds bridging the surfaces to adheringly unite the contacting surfaces of the interface.
  • the most expedient manufacturing systems such as the sequential or tandem extrusion of the dual layers of ethylene polymer and overlying elastomeric blends upon the wire core followed by simultaneous curing of both phases, together, would incur the preferred curing of each polymeric phase or material of the combination at the same time to achieve the optimum effects thereof.
  • FIG. 1 a typical cable of medium to high voltage capacity of the type to which this inventionis especially applicable and advantageous, is shown in perspective in FIG. 1, and a short portion of such a cable is also shown with the insulation and semiconductive layer in longitudinal cross section about the con- .ductor in FIG. 2.
  • the overall cable product 10 primarilytcomprises a metallic conductor 12, a relatively thick first body of insulation 14 surrounding the conductor, and overlying the insulation is a second body or layer of semiconductive material 16.
  • Other components can be included in the cable structure following known designs, for example separating paper or tape, or a semiconductive layer located between the metallic conductor 12 and the primary insulation 14, such as shown in the aforementioned Pats. Nos.
  • the following comprise specific examples of suitable and preferred polymeric materials for the application of this invention in the construction of high voltage cable comprising a body of polyethylene insulation combined with an overlying body of semiconductive material of a polymeric carrier or matrix comprising an elastomeric blend filled with particulate conductive material.
  • the ethylene polymer composition comprising the insulation, or one phase or polymeric body of the combination of this invention, consisted of the following typical commercial insulating formula:
  • EXAMPLE A Percent Parts by by weight weight weight Polyethylene, low density R-4 Sinclair Koppers Company 62.70 100.00 Calcined Clay Whitetex Clay 31.04 50.00 Titanium Dioxide pigment Titanox RA-NC 3.10 5.00 Antioxidant Monsanto Flectol-H, polytrimethyldihydroquinoline 1.09 1.75
  • ingredients were compounded in a suitable mixer, a roll mill, until substantially homogeneously dispersed.
  • all ingredients except for the perioxide were first admixed at elevated temperatures of about 250F, or within a range of about 200 to 300F, to flux to polymer and expedite the mixing. Thereafter the mix was cooled to below the decomposition temperature of the particular peroxide curing agent, in this case down to below about 220F, whereupon the peroxide curing agent was added and dispersed through the mix. The compound was then ready for forming to a given shape and curing by the application of heat.
  • the following comprises examples of the elastomeric blends comprising ethylene-propylene rubber admixed with chlorine containing elastomers consisting of polychloroprene, which as a body or layer in combination with a body or layer of an ethylene polymer, produces the unique interface characteristics of this invention.
  • the elastomeric blends were filled with an electrically conductive carbon black so as to perform as a semiconductive material in an electrical cable in combination with a polyethylene insulation of the above formulation.
  • Example 6 illustrates a ratio of 35 parts by weight of the ethylene-propylene terpolymer to 65 parts of chlorosulfonated polyethylene
  • Example 7 is a ratio of 30 parts of ethylenepropylene terpolymer to 70 parts of chlorosulfonated polyethylene.
  • the chlorosulfonated polyethylene rubber was a typical commercial Hypalon rubber designated 408, with a chlorine content of about 35 percent by weight and a sulfur content of about 1 percent by weight.
  • Hypalon or other chlorosulfonated rubber containing from about to 43 percent by weight of chlorine about 1 to 2 percent by weight of sulfur are suitable.
  • the peeling or stripping characteristic for the separation of the layer of semiconductive material from the underlying polyethylene insulation for each specimen was next evaluated.
  • the pulling force required to strip a one-half inch wide section of the 0.035 inch thick semiconductive material from the insulation substraturn was measured as 7.3 pounds for the formulation of Example 6 and 6.3 pounds for Example 7.
  • the separation in each case was clean and free of any residue.
  • An easily and cleanly strippable composite of cured polymeric materials comprising a body of an ethylene polymer with a surface adhering joined to a contacting surface of a body comprising an elastomeric blend of about .20 to parts by weight of a rubbery polymer of ethylene-propylene admixed with about to 80 parts by weight of at least one chlorine containing elastomer selected from the group consisting of polychloroprene and chlorosulfonated polyethylene, said contacting surfaces of polymeric materials being adheringly joined to each other by means of at least one of said polymeric materials having been cured while the said surfaces of each of the bodies are in adjoining physical contact with each other.
  • An insulated metallic electrical conductor having a covering thereon comprising polymeric materials including a composite of an electrically insulating body of cured ethylene polymer with a surface adheringly joined to a contacting surface of an easily and cleanly strippable overlying semiconductive body comprising an elastomeric blend of about 20 to 45 parts by weight of rubbery polymers of ethylene-propylene admixed with about 55 to 80 parts by weight of at least one chlorine containing elastomers selected from the group consisting of polychloroprene and chlorosulfonated polyethylene, said contacting surfaces of the insulating body and overlying semiconductive body being adheringly joined to each other by means of at least one of said polymeric materials having been cured while the said surfaces of each of the bodies are in adjoining physical contact with each other. ..1-.Q.'!J ⁇ gjg m li9 FL 3LFPl l electrically conductive filler dispersed therethrough.
  • elastomeric blend comprises about 25 to 45 parts by weight of a rubbery polymer of ethylenepropylene admixed with about 55 to 75 parts by weight of polychloroprene.
  • elastomeric blend comprises about 30 to 40 parts by weight of a rubbery polymer of ethylene-propylene substantially homogeneously admixed with about 60 to parts by weight of polychloroprene.
  • elastomeric blend comprises about 25 to 40 parts by weight of a rubbery polymer of ethylene-propylene admixed with about 60 to parts by weight of chlorosulfonated polyethylene.
  • elastomeric blend comprises about 30 to 35 parts by weight of a rubbery polymer of ethylene-propylene substantially homogeneously admixed with about 60 to 75 parts by weight of chlorosul- 22x30 I UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,793,476 Dated March 4, 1974 Inventor(s) Thaddeus D. Misiura and Joseph E. Vostovich It is certified that error appears in the above'identif'ied-patent and that said Letters Patent are hereby corrected as shown below:
US00336146A 1973-02-26 1973-02-26 Insulated conductor with a strippable layer Expired - Lifetime US3793476A (en)

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US (1) US3793476A (de)
JP (1) JPS5024378A (de)
CA (1) CA1013217A (de)
CH (1) CH601018A5 (de)
DE (1) DE2405012A1 (de)
ES (1) ES423611A1 (de)
FR (1) FR2219004B1 (de)
GB (1) GB1450465A (de)
IT (1) IT1007611B (de)
NL (1) NL7401748A (de)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2219004A1 (de) * 1973-02-26 1974-09-20 Gen Electric
US3909507A (en) * 1973-12-06 1975-09-30 Gen Electric Electrical conductors with strippable polymeric materials
US3925597A (en) * 1974-05-09 1975-12-09 Gen Electric Electrical conductors with strippable insulation and method of making the same
US3962517A (en) * 1974-06-12 1976-06-08 Bicc Limited Electric cables
JPS51132484A (en) * 1975-05-14 1976-11-17 Furukawa Electric Co Ltd:The Semiconductive composed material for power cable
US4002820A (en) * 1974-05-03 1977-01-11 Canada Wire And Cable Limited Power cable having an extensible ground check conductor
US4029830A (en) * 1974-05-04 1977-06-14 The Fujikura Cable Works, Ltd. Method of manufacturing insulated electric power cables
US4051298A (en) * 1974-05-09 1977-09-27 General Electric Company Strippable composite of polymeric materials for use in insulated electrical conductors, a method of forming the same and products thereof
US4061703A (en) * 1974-05-16 1977-12-06 General Electric Company Method of patching voids in a semi-conductive component of insulated electric cable, and compound therefor
US4075421A (en) * 1975-12-23 1978-02-21 General Electric Company Direct current cable with resistivity graded insulation, and a method of transmitting direct current electrical energy
US4170575A (en) * 1974-05-16 1979-10-09 General Electric Company Compound for patching voids in a semi-conductive component of insulated electric cable
US4317001A (en) * 1979-02-23 1982-02-23 Pirelli Cable Corp. Irradiation cross-linked polymeric insulated electric cable
US4384944A (en) * 1980-09-18 1983-05-24 Pirelli Cable Corporation Carbon filled irradiation cross-linked polymeric insulation for electric cable
US4449098A (en) * 1980-03-19 1984-05-15 Osaka Gas Company Limited Arrangement for detecting the location of an electrically insulative continuous item positioned underground
US4503284A (en) * 1983-11-09 1985-03-05 Essex Group, Inc. RF Suppressing magnet wire
US4545927A (en) * 1982-07-29 1985-10-08 Phillips Petroleum Company Conductive (hard) rubber compositions
US4642202A (en) * 1982-07-29 1987-02-10 Phillips Petroleum Company Conductive (hard) rubber compositions
FR2831703A1 (fr) * 2001-10-25 2003-05-02 Sagem Cable d'energie ou de communication adapte a etre enterre

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DE2513576A1 (de) * 1975-03-27 1976-10-07 Kabel & Lackdrahtfab Gmbh Hochspannungskabel
FR2552839B3 (fr) * 1983-10-03 1985-12-20 Joly Luc Joint d'etancheite annulaire a profil en v
GB9501774D0 (en) * 1995-01-31 1995-03-22 Reddiplex Ltd Method of extruding two or more materials
DE102004026541A1 (de) * 2004-05-27 2005-12-22 Schunk Kohlenstofftechnik Gmbh Anordnung zum Führen einer Schichtkohlebürste
DE102005034584B4 (de) * 2005-07-25 2007-09-20 Schunk Kohlenstoff-Technik Gmbh Kohlebürstenanordnung
GB2436395A (en) * 2006-03-24 2007-09-26 Tyco Electronics A heat resistant cable
JP2009297119A (ja) * 2008-06-11 2009-12-24 Adachi Kogyo:Kk 爪整形具

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3646248A (en) * 1971-02-22 1972-02-29 Anaconda Wire & Cable Co Electric cable
US3653423A (en) * 1970-05-13 1972-04-04 Uniroyal Inc Bonding epdm to butadiene rubbers

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3793476A (en) * 1973-02-26 1974-02-19 Gen Electric Insulated conductor with a strippable layer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3653423A (en) * 1970-05-13 1972-04-04 Uniroyal Inc Bonding epdm to butadiene rubbers
US3646248A (en) * 1971-02-22 1972-02-29 Anaconda Wire & Cable Co Electric cable

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2219004A1 (de) * 1973-02-26 1974-09-20 Gen Electric
US3909507A (en) * 1973-12-06 1975-09-30 Gen Electric Electrical conductors with strippable polymeric materials
US4002820A (en) * 1974-05-03 1977-01-11 Canada Wire And Cable Limited Power cable having an extensible ground check conductor
US4029830A (en) * 1974-05-04 1977-06-14 The Fujikura Cable Works, Ltd. Method of manufacturing insulated electric power cables
US3925597A (en) * 1974-05-09 1975-12-09 Gen Electric Electrical conductors with strippable insulation and method of making the same
US4051298A (en) * 1974-05-09 1977-09-27 General Electric Company Strippable composite of polymeric materials for use in insulated electrical conductors, a method of forming the same and products thereof
US4170575A (en) * 1974-05-16 1979-10-09 General Electric Company Compound for patching voids in a semi-conductive component of insulated electric cable
US4061703A (en) * 1974-05-16 1977-12-06 General Electric Company Method of patching voids in a semi-conductive component of insulated electric cable, and compound therefor
US3962517A (en) * 1974-06-12 1976-06-08 Bicc Limited Electric cables
JPS5515056B2 (de) * 1975-05-14 1980-04-21
JPS51132484A (en) * 1975-05-14 1976-11-17 Furukawa Electric Co Ltd:The Semiconductive composed material for power cable
US4075421A (en) * 1975-12-23 1978-02-21 General Electric Company Direct current cable with resistivity graded insulation, and a method of transmitting direct current electrical energy
US4317001A (en) * 1979-02-23 1982-02-23 Pirelli Cable Corp. Irradiation cross-linked polymeric insulated electric cable
US4449098A (en) * 1980-03-19 1984-05-15 Osaka Gas Company Limited Arrangement for detecting the location of an electrically insulative continuous item positioned underground
US4384944A (en) * 1980-09-18 1983-05-24 Pirelli Cable Corporation Carbon filled irradiation cross-linked polymeric insulation for electric cable
US4545927A (en) * 1982-07-29 1985-10-08 Phillips Petroleum Company Conductive (hard) rubber compositions
US4642202A (en) * 1982-07-29 1987-02-10 Phillips Petroleum Company Conductive (hard) rubber compositions
US4503284A (en) * 1983-11-09 1985-03-05 Essex Group, Inc. RF Suppressing magnet wire
FR2831703A1 (fr) * 2001-10-25 2003-05-02 Sagem Cable d'energie ou de communication adapte a etre enterre
EP1308968A1 (de) * 2001-10-25 2003-05-07 Sagem SA Leistungs- oder Nachrichtenkabel geeignet zur Eingrabung

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CA1013217A (en) 1977-07-05
FR2219004A1 (de) 1974-09-20
CH601018A5 (de) 1978-06-30
GB1450465A (en) 1976-09-22
FR2219004B1 (de) 1978-11-10
NL7401748A (de) 1974-08-28
ES423611A1 (es) 1976-11-01
DE2405012A1 (de) 1974-08-29
IT1007611B (it) 1976-10-30
JPS5024378A (de) 1975-03-15

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Owner name: VULKOR, INCORPORATED, A CORP. OF MA, MASSACHUSETT

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Effective date: 19871222