US3697670A - Electrical cable having sheath layers bonded with adhesive - Google Patents
Electrical cable having sheath layers bonded with adhesive Download PDFInfo
- Publication number
- US3697670A US3697670A US204023A US3697670DA US3697670A US 3697670 A US3697670 A US 3697670A US 204023 A US204023 A US 204023A US 3697670D A US3697670D A US 3697670DA US 3697670 A US3697670 A US 3697670A
- Authority
- US
- United States
- Prior art keywords
- electrical cable
- weight percent
- layer
- aluminum
- adhesive
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000853 adhesive Substances 0.000 title claims abstract description 26
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 26
- -1 polypropylene Polymers 0.000 claims abstract description 35
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 31
- 239000000463 material Substances 0.000 claims abstract description 30
- 239000004743 Polypropylene Substances 0.000 claims abstract description 28
- 229920001155 polypropylene Polymers 0.000 claims abstract description 28
- 239000010688 mineral lubricating oil Substances 0.000 claims abstract description 13
- 239000003963 antioxidant agent Substances 0.000 claims description 10
- 230000003078 antioxidant effect Effects 0.000 claims description 9
- 229920000642 polymer Polymers 0.000 claims description 7
- 238000000149 argon plasma sintering Methods 0.000 claims description 3
- 229920000098 polyolefin Polymers 0.000 abstract description 10
- 239000010410 layer Substances 0.000 description 31
- 239000004020 conductor Substances 0.000 description 9
- 239000004698 Polyethylene Substances 0.000 description 7
- 229920000573 polyethylene Polymers 0.000 description 7
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 5
- 239000005977 Ethylene Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 229920001577 copolymer Polymers 0.000 description 5
- 229920005606 polypropylene copolymer Polymers 0.000 description 5
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 5
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 3
- 239000012790 adhesive layer Substances 0.000 description 3
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920001519 homopolymer Polymers 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 239000005022 packaging material Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- HXIQYSLFEXIOAV-UHFFFAOYSA-N 2-tert-butyl-4-(5-tert-butyl-4-hydroxy-2-methylphenyl)sulfanyl-5-methylphenol Chemical compound CC1=CC(O)=C(C(C)(C)C)C=C1SC1=CC(C(C)(C)C)=C(O)C=C1C HXIQYSLFEXIOAV-UHFFFAOYSA-N 0.000 description 1
- GPNYZBKIGXGYNU-UHFFFAOYSA-N 2-tert-butyl-6-[(3-tert-butyl-5-ethyl-2-hydroxyphenyl)methyl]-4-ethylphenol Chemical compound CC(C)(C)C1=CC(CC)=CC(CC=2C(=C(C=C(CC)C=2)C(C)(C)C)O)=C1O GPNYZBKIGXGYNU-UHFFFAOYSA-N 0.000 description 1
- 239000004322 Butylated hydroxytoluene Substances 0.000 description 1
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- GHKOFFNLGXMVNJ-UHFFFAOYSA-N Didodecyl thiobispropanoate Chemical compound CCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCC GHKOFFNLGXMVNJ-UHFFFAOYSA-N 0.000 description 1
- 239000003508 Dilauryl thiodipropionate Substances 0.000 description 1
- 241000283984 Rodentia Species 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- 235000010354 butylated hydroxytoluene Nutrition 0.000 description 1
- 229940095259 butylated hydroxytoluene Drugs 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 235000019304 dilauryl thiodipropionate Nutrition 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 229920006262 high density polyethylene film Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000002480 mineral oil Substances 0.000 description 1
- 235000010446 mineral oil Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920002959 polymer blend Polymers 0.000 description 1
- 239000013047 polymeric layer Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000005871 repellent Substances 0.000 description 1
- 230000002940 repellent Effects 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Images
Classifications
-
- 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
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
- H01B7/2825—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable using a water impermeable sheath
Definitions
- ABSTRACT In an electrical cable having at least one polyolefin sheath layer and an aluminum sheath layer, the polyolefin layer is bonded to the aluminum layer with an adhesive material of 50 to 90 weight percent amorphous polypropylene and 50 to 10 weight percent mineral lubricating oil.
- This invention relates to a sheathed electrical cable.
- the invention relates to a sheathed telephone cable having polyolefin and aluminum layers in the sheath bonded together by an adhesive material.
- One of the problems encountered in designing electrical cable such as telephone cable for utilization in underground environment is finding a simple, economical, and yet effective, bonding material by which the sheathing materials such as layers of aluminum and polyolefin can be bonded to each other to form a waterproof exterior sheath. Besides adequately bonding these layers one to another, the bonding material should fill any voids between these layers to prevent the entry and travel of water, and should also allow the polyolefin to be peeled from the aluminum wrapping with moderate effort to expose the aluminum for grounding purposes.
- the present bonding composition has been found to be a suitable alternative to other frequently more complex or expensive bonding materials.
- Another object of the present invention is to provide a new and improved electrical cable.
- Another object of the invention is to provide an improved waterproof sheath for an electrical cable.
- Yet another object of the invention is to provide a material for bonding together thealuminum and polyolefin layers in the sheath of a telephone cable which polyolefin layer and adhesive layer can be peeled from the aluminum when exposure of the aluminum layer is desired.
- FIGURE is a perspective view in cross section of a multiconductor electrical cable embodying the present invention.
- a plurality of electrical conductors 11 are provided with individual insulation coatings 12.
- the insulated conductors can be stranded or twisted to form the cable core.
- This core is covered by a circumferentially continuous annular layer 13 of an electrically insulating synthetic thermoplastic organic polymeric material, preferably a polymer of at least one mono-l-olefin having up to eight carbon atoms per molecule.
- Polyethylene, polypropylene, and copolymers of ethylene or propylene with at least one other mono-l-olefin having up to eight carbon atoms per molecule are particularly suited for use as layer 13.
- Exemplary copolymers include the copolymers of ethylene and propylene, the copolymers of ethylene and butene, the copolymers of ethylene and hexene, and the copolymers of propylene and butene.
- Polyethylene particularly high density polyethylene, is presently preferred for this core wrap material. It can be in the form of a tape or ribbon or it can be an extruded layer.
- An annular layer 14 of aluminum is coaxial with and surrounds polymeric layer 13 and is bonded thereto by an adhesive layer 15.
- the aluminum layer 14 can be in any form known in the art, for example spirally wound aluminum tape, braid, or a longitudinal tape curved to tubular form.
- An outer cable coating or protective jacket 16 is coaxial with and surrounds aluminum layer 14, and is bonded thereto by an adhesive layer 17.
- the cable coating 16 is an electrically insulating synthetic thermoplastic organic, polymeric material, preferably one of the polymers of at least one mono-l-olefin named hereinabove with regard to layer 13.
- the cable coating 16 will sometimes contain a material such as carbon black to minimize degradation of the polymer during exposure to sunlight. It can also be in the form of a tape or ribbon but will most often be an extruded layer.
- the thickness of these various layers namely, the core wrap, the aluminum layer, and the outer jacket will depend upon the specific use intended but will generally be sufficient to impart the degree of strength, flexibility, and protection desired.
- each of layers 15 and 17 comprises an adhesive having from about 50 to about 90 weight percent amorphous (atactic) polypropylene, and from about 50 to about 10 weight percent mineral lubricating oil.
- Other conventional additives such as antioxidants, tackifiers, rodent repellents, pigments, and the like can be present in amounts ranging up to about 10 weight percent based on the adhesive.
- the adhesive comprises from about 60 to about weight percent amorphous polypropylene and about 0.05 to about 2 weight percent of at least one antioxidant with the remainder being the mineral lubricating oil.
- the amorphous polypropylene will have a molecular weight in the range of about 700 to about 100,000, as determined by light scattering, and preferably in the range of about 1,000 to about 70,000.
- the amorphous polypropylene will have a density in the range of about 0.83 to about 0.90 g/cc, as determined by ASTM Test D l505-60T.
- the amorphous polypropylene will generally have less than 10, and preferably less than 5, weight percent crystallinity as determined by X-ray diffraction patterns.
- the amorphous polypropylene can be a homopolymer of propylene or a copolymer of propylene with less than 10 weight percent of at least one other mono-l-olefin, for example, a copolymer of propylene and butene, a copolymer of propylene and ethylene, a copolymer of propylene and hexene, and the like.
- the presently preferred amorphous polypropylene is a homopolymer and is a material which is well known in the polymer art.
- a propylene polymerization process catalyzed by a catalyst system prepared from a titanium trihalide and an organoaluminum halide, produces a polymer mixture containing solid isotactic polypropylene and l to 20 weight percent atactic polypropylene.
- the atactic portion is extracted with a suitable hydrocarbon solvent and isolated. It will generally be desirable to remove as much of the catalyst residue from the atactic polypropylene as is economically removable to avoid adverse effects upon the electrical properties of the adhesive materials. This can be carried out by any suitable process such as acid washing. Similarly, any additives for the adhesive material should be selected to avoid any significant adverse effects upon the electrical properties of the adhesive material.
- the mineral lubricating oil will generally have a viscosity in the range of about 40 to about 150 SUS at 210 F.
- the lubricating oil can be one obtained by conventional refining or by solvent refining.
- the polypropylene and the mineral lubricating oil can be blended in any manner known in the art. This is most easily accomplished by simple mixing, preferably at slightly elevated temperatures at which the amorphous polypropylene becomes miscible with the mineral oil.
- a polyolefin decomposition inhibitor and more particularly at least one antioxidant, into the adhesive material.
- Suitable inhibitors include 2,2-methylenebis(4- ethyl-6-tert-butyl-phenol), butylated hydroxytoluene, dilaurylthiodipropionate, 4,4'-thiobis(o-tert-butyl-mcresol), and the like, and admixtures thereof.
- the sheathed cables of the present invention can be assembled by any suitable method in the electrical cable art.
- a telephone cable generally contains a number of paired wire conductors, each of which is sealed in an insulating coating such as solid polypropylene. These coated conductor wires are suitably twisted, gathered into a core, and encased in a core wrap such as polyethylene tape. Prior to the wrapping, it is advantageous to pass the core through a bath of viscous waterproofing filler such that the wrapped core has no free or void space between the insulated conductors.
- the wrapped core is then covered by a thin layer of aluminum, generally aluminum tape.
- the adhesive of the invention can be applied to the wrapped core in an amount sufficient to provide a thin yet at least substantially continuous film between the polyethylene wrap and the aluminum wrap.
- the final outer jacket of the cable generally a layer of extruded polyethylene, is then applied together with sufficient adhesive to provide a thin but at least substantially continuous film between the aluminum and the outer jacket.
- a bonding composition was prepared by mixing, at an elevated temperature, a quantity of amorphous polypropylene and a lubricating oil stock having a viscosity, at 210 F, of about 53-54.
- the composition contained 75 weight percent amorphous polypropylene.
- Also included in the composition was 0.2 weight percent of a commercial antioxidant identified as 4,4-thiobis( 6tert-butyl-m-cresol).
- a small portion of this bonding material was placed between a sheet of aluminum foil and sheet of high density polyethylene film. After contact, the two sheets became adequately bonded yet could be separated by peeling without any damage to either of the sheets.
- the bonded sheets of aluminum and polyethylene were also successfully tested by flexing at 30 F. Flexing at this low temperature did not destroy the bond between the aluminum and the polyethylene.
- An electrical cable comprising a plurality of electrical conductors, each of said conductors having a coatin la er of electrical insulati material, the thus msula ed conductors beiiig positio ied ad acent one another to form a core, an annular layer of a polymer of at least one mono-l-olefin coaxial to and surrounding said aluminum sheath, said annular layer being bonded to said aluminum sheath by an intervening layer of adhesive material comprising about 50 to about weight percent amorphous polypropylene and from about 50 to about 10 weight percent mineral lubricating oil.
Landscapes
- Organic Insulating Materials (AREA)
Abstract
In an electrical cable having at least one polyolefin sheath layer and an aluminum sheath layer, the polyolefin layer is bonded to the aluminum layer with an adhesive material of 50 to 90 weight percent amorphous polypropylene and 50 to 10 weight percent mineral lubricating oil.
Description
United States Patent Mitacek [54] ELECTRICAL CABLE HAVING SHEATH LAYERS BONDED WITH ADHESIVE [72] Inventor: Bill Mitacek, Bartlesville, Okla.
[73] Assignee: Phillips Petroleum Company [22] Filed: Dec. 2, 1971 [21] Appl. No.: 204,023
[52] US. Cl. ..174/107, 174/23 C, 174/36,
174/110PM, 174/113 R,l74/ll6 [51] Int. Cl. ..H0lb 7/18 [58] Field of Search...l74/l02 R, 102 D, 23 R, 23 C, 174/107, 120 R, 104, 113 R, 116, 110 PM,
[56] References Cited UNITED STATES PATENTS 3,622,683 1l/197l Roberts ..174/107 X 01 L-ATACT I c [451 Oct. 10, 1972 3,340,353 9/ 1967 Mildner ..174/ 106 D 2,492,568 12/1949 Gillis ..174/102 D 3,485,938 12/1969 Kingsley ..174/107 3,607,487 9/1971 Biskeborn 174/1 10 PM UX Primary Examiner-Lewis l-l. Myers Assistant Examiner-A. T. Grimley Att0rneyQuigg & Oberlin [5 7] ABSTRACT In an electrical cable having at least one polyolefin sheath layer and an aluminum sheath layer, the polyolefin layer is bonded to the aluminum layer with an adhesive material of 50 to 90 weight percent amorphous polypropylene and 50 to 10 weight percent mineral lubricating oil.
' 7 Claims, 1 Drawing Figure POLYPROPYLENE ADHESIVE PATENTEUUBT 10 :912
ALUM l NUMZ OI L-ATACT|C POLYPROPYLENE ADHESIVE INVENTOR. Bl u. M ITACEK ELECTRICAL CABLE HAVING SHEATH LAYERS BONDED WITH ADHESIVE This invention relates to a sheathed electrical cable. In a specific aspect, the invention relates to a sheathed telephone cable having polyolefin and aluminum layers in the sheath bonded together by an adhesive material.
One of the problems encountered in designing electrical cable such as telephone cable for utilization in underground environment is finding a simple, economical, and yet effective, bonding material by which the sheathing materials such as layers of aluminum and polyolefin can be bonded to each other to form a waterproof exterior sheath. Besides adequately bonding these layers one to another, the bonding material should fill any voids between these layers to prevent the entry and travel of water, and should also allow the polyolefin to be peeled from the aluminum wrapping with moderate effort to expose the aluminum for grounding purposes.
The present bonding composition has been found to be a suitable alternative to other frequently more complex or expensive bonding materials.
Accordingly, it is an object of the present invention to provide a new and improved electrical cable. Another object of the invention is to provide an improved waterproof sheath for an electrical cable. Yet another object of the invention is to provide a material for bonding together thealuminum and polyolefin layers in the sheath of a telephone cable which polyolefin layer and adhesive layer can be peeled from the aluminum when exposure of the aluminum layer is desired.
Other objects, aspects and advantages of the invention will be apparent from a study of the specification, the drawing, and the appended claims to the invention.
In the drawing, the single FIGURE is a perspective view in cross section of a multiconductor electrical cable embodying the present invention. A plurality of electrical conductors 11 are provided with individual insulation coatings 12. The insulated conductors can be stranded or twisted to form the cable core. This core is covered by a circumferentially continuous annular layer 13 of an electrically insulating synthetic thermoplastic organic polymeric material, preferably a polymer of at least one mono-l-olefin having up to eight carbon atoms per molecule. Polyethylene, polypropylene, and copolymers of ethylene or propylene with at least one other mono-l-olefin having up to eight carbon atoms per molecule are particularly suited for use as layer 13. Exemplary copolymers include the copolymers of ethylene and propylene, the copolymers of ethylene and butene, the copolymers of ethylene and hexene, and the copolymers of propylene and butene. Polyethylene, particularly high density polyethylene, is presently preferred for this core wrap material. It can be in the form of a tape or ribbon or it can be an extruded layer.
An annular layer 14 of aluminum is coaxial with and surrounds polymeric layer 13 and is bonded thereto by an adhesive layer 15. The aluminum layer 14 can be in any form known in the art, for example spirally wound aluminum tape, braid, or a longitudinal tape curved to tubular form.
An outer cable coating or protective jacket 16 is coaxial with and surrounds aluminum layer 14, and is bonded thereto by an adhesive layer 17. The cable coating 16 is an electrically insulating synthetic thermoplastic organic, polymeric material, preferably one of the polymers of at least one mono-l-olefin named hereinabove with regard to layer 13. The cable coating 16 will sometimes contain a material such as carbon black to minimize degradation of the polymer during exposure to sunlight. It can also be in the form of a tape or ribbon but will most often be an extruded layer.
The thickness of these various layers, namely, the core wrap, the aluminum layer, and the outer jacket will depend upon the specific use intended but will generally be sufficient to impart the degree of strength, flexibility, and protection desired.
In accordance with the present invention, each of layers 15 and 17 comprises an adhesive having from about 50 to about 90 weight percent amorphous (atactic) polypropylene, and from about 50 to about 10 weight percent mineral lubricating oil. Other conventional additives such as antioxidants, tackifiers, rodent repellents, pigments, and the like can be present in amounts ranging up to about 10 weight percent based on the adhesive. In a presently preferred embodiment the adhesive comprises from about 60 to about weight percent amorphous polypropylene and about 0.05 to about 2 weight percent of at least one antioxidant with the remainder being the mineral lubricating oil.
In general, the amorphous polypropylene will have a molecular weight in the range of about 700 to about 100,000, as determined by light scattering, and preferably in the range of about 1,000 to about 70,000. The amorphous polypropylene will have a density in the range of about 0.83 to about 0.90 g/cc, as determined by ASTM Test D l505-60T. The amorphous polypropylene will generally have less than 10, and preferably less than 5, weight percent crystallinity as determined by X-ray diffraction patterns. The amorphous polypropylene can be a homopolymer of propylene or a copolymer of propylene with less than 10 weight percent of at least one other mono-l-olefin, for example, a copolymer of propylene and butene, a copolymer of propylene and ethylene, a copolymer of propylene and hexene, and the like. The presently preferred amorphous polypropylene is a homopolymer and is a material which is well known in the polymer art. It is widely available as a by-product in well known processes for the polymerization of propylene to solid atactic polypropylene, a material already described above as being suitable for conductor insulation, or core wrap, or outer jacket material. Thus, a propylene polymerization process, catalyzed by a catalyst system prepared from a titanium trihalide and an organoaluminum halide, produces a polymer mixture containing solid isotactic polypropylene and l to 20 weight percent atactic polypropylene. The atactic portion is extracted with a suitable hydrocarbon solvent and isolated. It will generally be desirable to remove as much of the catalyst residue from the atactic polypropylene as is economically removable to avoid adverse effects upon the electrical properties of the adhesive materials. This can be carried out by any suitable process such as acid washing. Similarly, any additives for the adhesive material should be selected to avoid any significant adverse effects upon the electrical properties of the adhesive material.
The mineral lubricating oil will generally have a viscosity in the range of about 40 to about 150 SUS at 210 F. The lubricating oil can be one obtained by conventional refining or by solvent refining. The polypropylene and the mineral lubricating oil can be blended in any manner known in the art. This is most easily accomplished by simple mixing, preferably at slightly elevated temperatures at which the amorphous polypropylene becomes miscible with the mineral oil.
It will generally be desirable to incorporate a polyolefin decomposition inhibitor, and more particularly at least one antioxidant, into the adhesive material. Suitable inhibitors include 2,2-methylenebis(4- ethyl-6-tert-butyl-phenol), butylated hydroxytoluene, dilaurylthiodipropionate, 4,4'-thiobis(o-tert-butyl-mcresol), and the like, and admixtures thereof.
The sheathed cables of the present invention can be assembled by any suitable method in the electrical cable art. As an example, a telephone cable generally contains a number of paired wire conductors, each of which is sealed in an insulating coating such as solid polypropylene. These coated conductor wires are suitably twisted, gathered into a core, and encased in a core wrap such as polyethylene tape. Prior to the wrapping, it is advantageous to pass the core through a bath of viscous waterproofing filler such that the wrapped core has no free or void space between the insulated conductors.
The wrapped core is then covered by a thin layer of aluminum, generally aluminum tape. As part of the aluminum wrapping operation, the adhesive of the invention can be applied to the wrapped core in an amount sufficient to provide a thin yet at least substantially continuous film between the polyethylene wrap and the aluminum wrap.
The final outer jacket of the cable, generally a layer of extruded polyethylene, is then applied together with sufficient adhesive to provide a thin but at least substantially continuous film between the aluminum and the outer jacket.
in a specific illustration of the effectiveness of the present invention, a bonding composition was prepared by mixing, at an elevated temperature, a quantity of amorphous polypropylene and a lubricating oil stock having a viscosity, at 210 F, of about 53-54. The composition contained 75 weight percent amorphous polypropylene. Also included in the composition was 0.2 weight percent of a commercial antioxidant identified as 4,4-thiobis( 6tert-butyl-m-cresol). A small portion of this bonding material was placed between a sheet of aluminum foil and sheet of high density polyethylene film. After contact, the two sheets became adequately bonded yet could be separated by peeling without any damage to either of the sheets. The bonded sheets of aluminum and polyethylene were also successfully tested by flexing at 30 F. Flexing at this low temperature did not destroy the bond between the aluminum and the polyethylene.
Reasonable variations and modifications are possible within the scope of the foregoing disclosure, the drawing, and the appended claims to the invention.
What is claimed is:
1. An electrical cable comprising a plurality of electrical conductors, each of said conductors having a coatin la er of electrical insulati material, the thus msula ed conductors beiiig positio ied ad acent one another to form a core, an annular layer of a polymer of at least one mono-l-olefin coaxial to and surrounding said aluminum sheath, said annular layer being bonded to said aluminum sheath by an intervening layer of adhesive material comprising about 50 to about weight percent amorphous polypropylene and from about 50 to about 10 weight percent mineral lubricating oil.
2. An electrical cable in accordance with claim 1 wherein a second annular layer of a polymer of at least one mono-l-olefin is coaxial with said core and positioned between said core and said aluminum sheath and is bonded to said aluminum sheath by a second layer of said adhesive material.
3. An electrical cable in accordance with claim 2 wherein said adhesive material further comprises an antioxidant.
4. An electrical cable in accordance with claim 2 wherein said adhesive material is about 60 to about 80 weight percent amorphous polypropylene and about 0.05 to about 2 weight percent of at least one antioxidant with the remainder being said mineral lubricating oil.
5. An electrical cable in accordance with claim 4 wherein said amorphous polypropylene has a molecular weight in the range of about 700 to about 100,000, as determined by light scattering and a density in the range of about 0.83 to about 0.90 gm/cc at 25 C.
6. An electrical cable in accordance with claim 5 wherein said mineral lubricating oil has a viscosity in the range of about 40 to about SUS at 210 F.
7. An electrical cable in accordance with claim 6 wherein said adhesive material comprises about 75 weight percent amorphous polypropylene, about 25 weight percent mineral lubricating oil, and about 0.2 weight percent of an antioxidant.
UNITED STATES PATENT ur'nun.
CERTIFICATE OF CORRECTION Patent N00 3, 97,670 a October 10, 1972 Y Bill Mitacek It is certified that error appears in the above-i 1entified patent and that 38.1 Letters Patent are hereby c'orreoted as shown below: 1
Column 4, line 16, after "acre" insert an annular aluminum sheath coaxial to and surrounding said core,
In the drawings, "atactic" should be "am0rph0us",
Signed and sealed this 27th day of November 1973.
('SEALj' Attest'.
EDWARDM PLBTCFHERJ R. RENE D. TEGTMEYER Attesting Officer Acting Commissioner of Patents,
UNITED SPATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent N00 3, 97, 70 D October 10, 1972 Bill Mitacek It is certified that error appears in the above-identified patent and that sai letters Patent are hereby correeted as shown below:
Column 1;, line 16, after "core" insert an annular aluminum sheath coaxial to and surrounding said core,
In the drawings, "atactic" should be amorphousfl Signed and sealed this 27th day of NovembeT 1973.
(SEALj Attestz EDWARD M,FLET( IHBR,JR. v RENE D. TEGTMEYER Attestlng Offlcer Acting Commissioner of Patents
Claims (6)
- 2. An electrical cable in accordance with claim 1 wherein a second annular layer of a polymer of at least one mono-1-olefin is coaxial with said core and positioned between said core and said aluminum sheath and is bonded to said aluminum sheath by a second layer of said adhesive material.
- 3. An electrical cable in accordance with claim 2 wherein said adhesive material further comprises an antioxidant.
- 4. An electrical cable in accordance with claim 2 wherein Said adhesive material is about 60 to about 80 weight percent amorphous polypropylene and about 0.05 to about 2 weight percent of at least one antioxidant with the remainder being said mineral lubricating oil.
- 5. An electrical cable in accordance with claim 4 wherein said amorphous polypropylene has a molecular weight in the range of about 700 to about 100,000, as determined by light scattering and a density in the range of about 0.83 to about 0.90 gm/cc at 25* C.
- 6. An electrical cable in accordance with claim 5 wherein said mineral lubricating oil has a viscosity in the range of about 40 to about 150 SUS at 210* F.
- 7. An electrical cable in accordance with claim 6 wherein said adhesive material comprises about 75 weight percent amorphous polypropylene, about 25 weight percent mineral lubricating oil, and about 0.2 weight percent of an antioxidant.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US20402371A | 1971-12-02 | 1971-12-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3697670A true US3697670A (en) | 1972-10-10 |
Family
ID=22756291
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US204023A Expired - Lifetime US3697670A (en) | 1971-12-02 | 1971-12-02 | Electrical cable having sheath layers bonded with adhesive |
Country Status (1)
Country | Link |
---|---|
US (1) | US3697670A (en) |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4104480A (en) * | 1976-11-05 | 1978-08-01 | General Cable Corporation | Semiconductive filling compound for power cable with improved properties |
US4246435A (en) * | 1979-07-20 | 1981-01-20 | General Cable Corporation | Filled communication cable employing a paraffinic oil-base filling compound |
US4563540A (en) * | 1984-06-29 | 1986-01-07 | At&T Technologies, Inc. | Bonded sheath cable |
DE8704896U1 (en) * | 1987-04-02 | 1987-06-25 | Felten & Guilleaume Energietechnik AG, 5000 Köln | Flexible cable for electrical power supply of submersible pumps in oil extraction and oil storage areas |
US4704596A (en) * | 1986-11-19 | 1987-11-03 | Essex Group, Inc. | Extrusion coated ignition wire |
US4724277A (en) * | 1985-05-16 | 1988-02-09 | Witco Corp. | Cable with flooding compound |
US5554236A (en) * | 1994-03-03 | 1996-09-10 | W. L. Gore & Associates, Inc. | Method for making low noise signal transmission cable |
US6166331A (en) * | 1996-05-07 | 2000-12-26 | Telefonaktiebolaget Lm Ericsson, (Publ) | Device and method relating to cable branching |
US6441308B1 (en) * | 1996-06-07 | 2002-08-27 | Cable Design Technologies, Inc. | Cable with dual layer jacket |
EP2312591A1 (en) * | 2009-08-31 | 2011-04-20 | Nexans | Fatigue resistant metallic moisture barrier in submarine power cable |
US20140246109A1 (en) * | 2012-01-20 | 2014-09-04 | Aerazur | Protective sheath, in particular for electrical cables, and method for manufacturing same |
US20190036239A1 (en) * | 2017-07-31 | 2019-01-31 | Ppc Broadband, Inc. | Coaxial drop cable with circumferential segmented floodant locations |
US20190237215A1 (en) * | 2018-01-26 | 2019-08-01 | Hitachi Metals, Ltd. | Insulated Wire |
-
1971
- 1971-12-02 US US204023A patent/US3697670A/en not_active Expired - Lifetime
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4104480A (en) * | 1976-11-05 | 1978-08-01 | General Cable Corporation | Semiconductive filling compound for power cable with improved properties |
US4246435A (en) * | 1979-07-20 | 1981-01-20 | General Cable Corporation | Filled communication cable employing a paraffinic oil-base filling compound |
US4563540A (en) * | 1984-06-29 | 1986-01-07 | At&T Technologies, Inc. | Bonded sheath cable |
US4724277A (en) * | 1985-05-16 | 1988-02-09 | Witco Corp. | Cable with flooding compound |
US4704596A (en) * | 1986-11-19 | 1987-11-03 | Essex Group, Inc. | Extrusion coated ignition wire |
DE8704896U1 (en) * | 1987-04-02 | 1987-06-25 | Felten & Guilleaume Energietechnik AG, 5000 Köln | Flexible cable for electrical power supply of submersible pumps in oil extraction and oil storage areas |
US5554236A (en) * | 1994-03-03 | 1996-09-10 | W. L. Gore & Associates, Inc. | Method for making low noise signal transmission cable |
US6166331A (en) * | 1996-05-07 | 2000-12-26 | Telefonaktiebolaget Lm Ericsson, (Publ) | Device and method relating to cable branching |
US6441308B1 (en) * | 1996-06-07 | 2002-08-27 | Cable Design Technologies, Inc. | Cable with dual layer jacket |
US7276664B2 (en) | 1996-06-07 | 2007-10-02 | Belden Technologies, Inc. | Cable with dual layer jacket |
EP2312591A1 (en) * | 2009-08-31 | 2011-04-20 | Nexans | Fatigue resistant metallic moisture barrier in submarine power cable |
US20140246109A1 (en) * | 2012-01-20 | 2014-09-04 | Aerazur | Protective sheath, in particular for electrical cables, and method for manufacturing same |
US20190036239A1 (en) * | 2017-07-31 | 2019-01-31 | Ppc Broadband, Inc. | Coaxial drop cable with circumferential segmented floodant locations |
US10573980B2 (en) * | 2017-07-31 | 2020-02-25 | Ppc Broadband, Inc. | Coaxial drop cable with circumferential segmented floodant locations |
US20190237215A1 (en) * | 2018-01-26 | 2019-08-01 | Hitachi Metals, Ltd. | Insulated Wire |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
KR920000223B1 (en) | Electrical cable | |
US3697670A (en) | Electrical cable having sheath layers bonded with adhesive | |
US4041237A (en) | Electric conductor adapted for use in process instrumentation | |
AU2006350918B2 (en) | Energy cable | |
KR20040030420A (en) | Cable with recyclable covering | |
US5416269A (en) | Insulated cable and method of making same | |
US3499791A (en) | Quaternary ammonium salt containing polyolefin covered electrical conductor | |
US4020276A (en) | Sealant barrier for electrical cables | |
EP0024631A1 (en) | Electric cable with improved water-block | |
EP0241330B1 (en) | Oil resistant cable | |
US4140818A (en) | Freely strippable electrical cable insulation composition and method | |
US2913515A (en) | Shielded polyethylene insulated electric conductor | |
CN205862862U (en) | A kind of fire-retardant quad line of high insulation resistance | |
RU224316U1 (en) | Explosion-proof power cable | |
AU2002237234B2 (en) | Electrical cable, particularly for high voltage direct current transmission or distribution, and insulating composition | |
JPS598216A (en) | Polyolefin insulated power cable with semiconductive layer | |
RU224311U1 (en) | Power explosion-proof cable | |
RU29610U1 (en) | Control cable | |
JPS6344244B2 (en) | ||
JP2666543B2 (en) | Electric wires and cables | |
WO2016005791A1 (en) | Energy cable having a thermoplastic electrically insulating layer | |
JP2563531B2 (en) | Power cable | |
GB2187589A (en) | High voltage cable | |
CA2417877C (en) | Electrical cable for high voltage direct current transmission, and insulating composition | |
EP1221702A1 (en) | Process for producing an electrical cable, particularly for high voltage direct current transmission or distribution |