US3719769A - Insulated electric cable having an external semiconductive layer - Google Patents
Insulated electric cable having an external semiconductive layer Download PDFInfo
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- US3719769A US3719769A US00077918A US3719769DA US3719769A US 3719769 A US3719769 A US 3719769A US 00077918 A US00077918 A US 00077918A US 3719769D A US3719769D A US 3719769DA US 3719769 A US3719769 A US 3719769A
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- cable
- semiconductive layer
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- vinyl acetate
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- 239000004703 cross-linked polyethylene Substances 0.000 claims abstract description 18
- 229920003020 cross-linked polyethylene Polymers 0.000 claims abstract description 18
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 16
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 16
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 7
- 125000000864 peroxy group Chemical group O(O*)* 0.000 claims abstract description 6
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 claims abstract description 4
- 229920001577 copolymer Polymers 0.000 claims description 12
- 239000005977 Ethylene Substances 0.000 claims description 7
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 6
- 238000009413 insulation Methods 0.000 claims description 6
- 239000011256 inorganic filler Substances 0.000 claims description 3
- 229910003475 inorganic filler Inorganic materials 0.000 claims description 3
- 229920006037 cross link polymer Polymers 0.000 claims description 2
- 239000006229 carbon black Substances 0.000 abstract description 7
- 229940117958 vinyl acetate Drugs 0.000 description 12
- 239000000203 mixture Substances 0.000 description 10
- 101000969770 Homo sapiens Myelin protein zero-like protein 2 Proteins 0.000 description 9
- 102100021272 Myelin protein zero-like protein 2 Human genes 0.000 description 9
- -1 polyethylene Polymers 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 239000003431 cross linking reagent Substances 0.000 description 4
- 239000005022 packaging material Substances 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 239000004698 Polyethylene Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 239000000454 talc Substances 0.000 description 3
- 229910052623 talc Inorganic materials 0.000 description 3
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 239000006057 Non-nutritive feed additive Substances 0.000 description 2
- 229920005601 base polymer Polymers 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- XOOUIPVCVHRTMJ-UHFFFAOYSA-L zinc stearate Chemical compound [Zn+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O XOOUIPVCVHRTMJ-UHFFFAOYSA-L 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- JIGUQPWFLRLWPJ-UHFFFAOYSA-N Ethyl acrylate Chemical compound CCOC(=O)C=C JIGUQPWFLRLWPJ-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical class O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/002—Inhomogeneous material in general
- H01B3/004—Inhomogeneous material in general with conductive additives or conductive layers
-
- 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
- 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
Definitions
- ABSTRACT An insulated electric cable having an external semiconductive layer with easy stripping qualities for termination wherein the cable is insulated primarily with crosslinked polyethylene or a crosslinked polyethylene copolymer and the external semiconductive layer consists of an ethylene vinyl acetate copolymer containing 25-55 wt-percent vinyl acetate and 2,5-dimethyl-2',5'-di(tertiary butyl/peroxy)-hexinc-3 and an inclusion of an electric conductive substance such as carbon black to render the layer semiconductive.
- This invention relates to an insulated cable having an external semiconductive layer, and more particularly to the structure of an insulated cable having an insulation primarily consisting of crosslinked polyethylene or a crosslinked polyethylene copolymer, having an external semiconductive layer.
- the present invention is intended to provide a crosslinked polyethylene insulated cable having a semiconductive layer which can be easily stripped off without leaving a fraction of the semiconductive layer on the surface of the insulating layer nor marring the insulating layer.
- the present invention pertains to' a crosslinked polyethylene insulated cable having a semiconductive layer which is extruded over the insulating layer, and provides the cable with a semiconductive layer which can be easily stripped off.
- This semiconductive layer is formed by extruding a composition obtained by mixing When splicing and treating the end of a crosslinked a copolymer of ethylene and vinyl acetate, containing 25-55 wt percent vinyl acetate and desirably in a range, in excess of 0.2 but less than 6.0 wt. parts of 2,5- dimethyl-2, 5-di(tertiary butyl peroxy)-hexene-3 in respect of 100 wt. parts of said polymer, and an electric conductive substance.
- age resistors may be further added thereto according to the operation conditions.
- FIG. 1 An example of the insulated cable having the external semiconductive layer of the invention is shown in FIG. 1, wherein, the cable consists of the conductor 1, internal semiconductive layer 2, insulating layer 3 and external semiconductive layer 4.
- a stranded conductor having a sectional area of 100 mm was covered with an ordinary extruded semiconductive layer, over which the insulating layer and semiconductive layer as shown in Table l were extruded in succession to cover the cable, and the product was completely crosslinked in a saturated water vapor under an atmospheric pressure of 15 atmospheres.
- the semiconductive layers in the table respectively contained wt. parts of acethylene carbon black, 1 wt. part of age resistor and 1 wt. part of zinc stearate, all based on 100 wt. parts of the base polymer, but the type and amount of the crosslinking agents and the thickness of the semiconductive layer were varied.
- the layer will not be stripped off easily, and if it exceeds wt. percent, its adhesion to the insulating layer will be impaired, making the cable unfit for use.
- the content of vinyl acetate of the EVA copolymer is 25-55 wt. percent the layer can be stripped off with utmost ease.
- the thickness of the layer if the thickness of the semiconductive layer extruded over the insulat- TABLE 1 Semieonrluctive layer (over insulating layer) Crosslinking Thickness No. Insulating layer Base polymer agent (mm.) Peeling strength (kg/ mm.)
- Example 3... EFA, VA 50%, 511:0. X,1 0.5 2.
- Reference 2 ..do Same as Example .2 Nil 0. 5 Semiconduetive layer torn so not stripped 011'.
- Example 8 ..d0; .(lo X, 1.5%... 0.2 3.3.
- Exampleil (l0 X, 1.5%... 0.5 3.4.
- Example 10. X, 1.5%.. L0 3.3.
- Example 11 across 2 2.0% together 0.7 3.5
- Example 12 Combination of Example 11: 100 ...do X, 2.0%... 0. 7 3.0.
- Example 13 Apart from Composition of Example 12: 100 ..do X, 2 0%... 0. 7 3.1.
- Example 15 Apart Composition of Example 14: 100 ..do X, 1.6%... 1. 0 3.0.
- EVA Eth1ene vinyl acetate copolymer
- ⁇ 'A amount ofvinyl acetate in copolymer.
- ing layer is less than 0.1 mm, the layer, when stripped, will easily tear off, and it should be desirably more than 0.1 mm.
- 2,5-di-methyl-2',5-di(tertiary butyl peroxy)-hexinc-3 is .added to a high molecular polymer other than ethylenevinylacetatc copolymer, excellent effects can not be expected. Only by the use of the composition of the invention, can the semiconductive layer, which can be effectively stripped off, be obtained.
- the amount of carbon black is not particularly limited, but if it is less than 25 percent, the electric conductivity as required in the invention can not be obtained while an amount exceeding 70 percent will deteriorate the mechanical proparties of the conductive layer, itself, impairing workability thereof, so that a range of 25-70 percent is desirable.
- the present invention can be, of course, applied to electric cables having a insulating layer whose principal component is crosslinkcd polyethylene or crosslinked polyethylene copolymer, irrespective of the size and use of the cable.
- An insulated electric cable having an external semiconductive layer extruded over the insulating layer thereof comprising a cable insulated primarily with an insulation selected from the group consisting of crosslinked polyethylene and crosslinked polyethylene copolymer, and an external semiconductivc layer consisting of an ethylene vinyl acetate copolymer containing 25-55 wt. percent vinyl acetate and 2,5-dimethyl- 2,5'-di(tertiary-butyl/peroxy)-hexine-3 and an inclusion of an electric conductive substance.
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Conductive Materials (AREA)
Abstract
An insulated electric cable having an external semiconductive layer with easy stripping qualities for termination wherein the cable is insulated primarily with crosslinked polyethylene or a crosslinked polyethylene copolymer and the external semiconductive layer consists of an ethylene vinyl acetate copolymer containing 25-55 wt-percent vinyl acetate and 2,5dimethyl-2'',5''-di(tertiary butyl/peroxy)-hexine-3 and an inclusion of an electric conductive substance such as carbon black to render the layer semiconductive.
Description
United States Patent 91 Miyauchi et a1.
[451 March 6, 1973 1 INSULATED ELECTRIC CABLE HAVING AN EXTERNAL SEMICONDUCTIVE LAYER [75] lnventors: Hirokazu Miyauchi; I-Iironaga Matsubara, both of Osaka, Japan [73] Assignee: Sumitomo Electric Industries, Ltd.
Osaka, Japan [22] Filed: Oct. 5, 1970 [21] Appl. No.: 77,918
[52] US. Cl...174/l20 SC, 174/105 SC, 174/110 PM [51] Int. Cl. ..H0lb 9/02 [58] Field of Search...174/36, 120 R, 120 SC, 102 R,
174/102 SC, 105 SC, 106 SC, 110 PM, 107,
[56] References Cited UNITED STATES PATENTS 3,259,688 7/1966 Towne et a1. 1 74/127 X 3,441,660 4/1969 Garner 174/1 10 PM X 3,472,692 10/1969 Setsuya lsshiki ..l74/l06 SC UX 3,433,891 3/1969 Zysk et a1 ..l74/l02 SC X 3,287,489 12/1966 Huizd, Jr.
3,096,210 7/1963 Boonstra ..l74/l 10 PM UX FOREIGN PATENTS OR APPLICATIONS 1,103,099 2/1968 Great Britain ..174/102 SC OTHER PUBLICATIONS The Condensed Chemical Dictionary 6th Ed., Reinhold 1961, p. 395. (QD 5 C5 1961 c.12)
Primary ExaminerBernard A. Gilheany Assistant ExaminerA. T. Grimley Attorney-Carothers and Cal-others [5 7] ABSTRACT An insulated electric cable having an external semiconductive layer with easy stripping qualities for termination wherein the cable is insulated primarily with crosslinked polyethylene or a crosslinked polyethylene copolymer and the external semiconductive layer consists of an ethylene vinyl acetate copolymer containing 25-55 wt-percent vinyl acetate and 2,5-dimethyl-2',5'-di(tertiary butyl/peroxy)-hexinc-3 and an inclusion of an electric conductive substance such as carbon black to render the layer semiconductive.
7 Claims, .1 Drawing Figure INSULATED ELECTRIC CABLE HAVING AN EXTERNAL SEMICONDUCTIVE LAYER This invention relates to an insulated cable having an external semiconductive layer, and more particularly to the structure of an insulated cable having an insulation primarily consisting of crosslinked polyethylene or a crosslinked polyethylene copolymer, having an external semiconductive layer.
In the conventional art, when covering the insulating layer of a crosslinked polyethylene insulated cable with an extruded semiconductive layer, wherein low density polyethylene, a copolymer of ethylene and vinyl acetate or a polymer consisting mainly of these substances is used as the base of the insulation layer, to which are further added talc, clay, calcium carbonate and like inorganic fillers, various age resistors, processing aids and the like as required, it is a usual practice to use a composition such as a mixture of a copolymer of ethylene and ethyl acrylate, with dicumyl peroxide and the like AD crosslinking agents and electrio-conductive carbon black, or a mixture of a copolymer of ethylene and vinyl acetate, with dicumyl peroxide and the like crosslinking agents, and electricconductive carbon black for the semiconductor outer layer.
polyethylene insulated cable having the external semiconductive layer, it is necessary to remove the semiconductive layer of the cable for a certain length from the end thereof. The removal of the semiconductive layer should be complete in this case, and in removing it the insulating layer should be left intact. In recent years, through the development of the art, parts and accessories premolded to the shape of cable joints and terminations have come in handily for the splicing and terminating of crosslinked polyethylene insulated cable having an external semiconductive layer. This method gives a more stable quantity and facilitates a more speedy operation as compared with the conventional treatment methods of wrapping with a tape, heat molding and like means, and the above method is now widely used. In this method, however, it is required that the premolded accessories used should be fitted to the contour ofthe cable without allowing any electrical faults to exist therebetween. Thus demands are growing for a method to easily strip off the semiconductive layer without damaging the insulating layer in a short period of time than heretofore possible.
When the conventional compositions as abovementioned are used to cover the insulated layer, it is hard and takes time to first strip off the semiconductive coating, and the insulation layer easily marred. Thus none of these compositions satisfy the abovementioned requirements.
The present invention, however, is intended to provide a crosslinked polyethylene insulated cable having a semiconductive layer which can be easily stripped off without leaving a fraction of the semiconductive layer on the surface of the insulating layer nor marring the insulating layer.
The present invention pertains to' a crosslinked polyethylene insulated cable having a semiconductive layer which is extruded over the insulating layer, and provides the cable with a semiconductive layer which can be easily stripped off. This semiconductive layer is formed by extruding a composition obtained by mixing When splicing and treating the end of a crosslinked a copolymer of ethylene and vinyl acetate, containing 25-55 wt percent vinyl acetate and desirably in a range, in excess of 0.2 but less than 6.0 wt. parts of 2,5- dimethyl-2, 5-di(tertiary butyl peroxy)-hexene-3 in respect of 100 wt. parts of said polymer, and an electric conductive substance.
lf required, age resistors, processing aids and the like may be further added thereto according to the operation conditions.
As the result of researches by the inventors it has been confirmed that the amount of carbon black (25-70 wt. parts based on 100 wt. parts of the polymer), amine-, or phenol-based age resistors and zinc stearate and the like processing agents do not affect the ease of stripping off the semiconductive layer.
An example of the insulated cable having the external semiconductive layer of the invention is shown in FIG. 1, wherein, the cable consists of the conductor 1, internal semiconductive layer 2, insulating layer 3 and external semiconductive layer 4.
Examples of the invention, examples for reference and examples for comparison will be given hereinafter, in which different materials as mentioned hereinafter were used.
A stranded conductor having a sectional area of 100 mm was covered with an ordinary extruded semiconductive layer, over which the insulating layer and semiconductive layer as shown in Table l were extruded in succession to cover the cable, and the product was completely crosslinked in a saturated water vapor under an atmospheric pressure of 15 atmospheres.
Incisions, 10 mm wide and running in the axial direction of the cable, were made in the external semiconductive layer covering the surface of the cable, and the cable was subjected to a peeling test by a tension tester, results of which are also shown in Table l.
The semiconductive layers in the table respectively contained wt. parts of acethylene carbon black, 1 wt. part of age resistor and 1 wt. part of zinc stearate, all based on 100 wt. parts of the base polymer, but the type and amount of the crosslinking agents and the thickness of the semiconductive layer were varied.
As is evident from the examples, only when an ethylene vinyl acetate copolymer containing 25-55 wt percent vinyl acetate and 2,5-dimethyl-2,5'-di-(tertiary butyl peroxy)-hexine-3 are combined is the desired semiconductive layer of the present invention obtained, one which can be easily stripped off the base insulation of crosslinked polyethylene copolymer.
If the content of vinyl acetate is less than 25 wt. percent of the ethylene vinyl/acetate copolymer, the layer will not be stripped off easily, and if it exceeds wt. percent, its adhesion to the insulating layer will be impaired, making the cable unfit for use. When the content of vinyl acetate of the EVA copolymer is 25-55 wt. percent the layer can be stripped off with utmost ease.
When the content of 2,5-dimethyl-2',5'-di(tertiary butyl peroxy)-hexine-3 is less than 0.2 wt. part based on wt. parts of said copolymer, the peeling strength of the semiconductive layer is relatively low, and if it exceeds 6 wt. parts the adhesion of the semiconductive layer to the insulating material is impaired, also reducing the applicability of the cable. A range, in excess of 0.2 but less than 6 wt. parts, exhibits the best results.
As regards the thickness of the layer, if the thickness of the semiconductive layer extruded over the insulat- TABLE 1 Semieonrluctive layer (over insulating layer) Crosslinking Thickness No. Insulating layer Base polymer agent (mm.) Peeling strength (kg/ mm.)
Reference Polyethylene Sp. gr.=0.92 g./cc., EVA1, \'A=15%, i=6 X2, 1%... 0. 5 More than 5, and left on "-3 MI=2, "-4 DCP=2.0%, insulating layer.
age resistor=0.2%. Example 1 Same as Reference 1 EVA, VA=%, 1:0 X, 1%....... 0.5 3.0. Example 2. ..do EVA, \"A=35%, Ml=6 X, 1%... 0.5 3.5. Example 3... EFA, VA=50%, 511:0. X,1 0.5 2. Reference 2 ..do Same as Example .2 Nil 0. 5 Semiconduetive layer torn so not stripped 011'. Reference 3 ..do ..do X, 0.2 0.5 Do. Example 4... X, 0.3 0.5 3.5. Example 5. X, 0.5 0. 5 3.5. Example 6. X, 1.0 0.5 3.5. Example 7... X, 6.0 0. 5 3.0. Reference 4. X, 0.0 0. 5 0.3. Reference 5 lo X, 1.5 0.1 .umiconduetive layer torn so not stripped 011. Example 8 ..d0..... .(lo X, 1.5%... 0.2 3.3. Exampleil (l0 X, 1.5%... 0.5 3.4. Example 10. X, 1.5%.. L0 3.3. Example 11..... 2 2.0%..... 0.7 3.5
0%, age reg tor=0.2%. Example 12..... Composition of Example 11: 100 ...do X, 2.0%... 0. 7 3.0.
Wt. parts plus talc: wt. parts. Example 13..... Composition of Example 12: 100 ..do X, 2 0%... 0. 7 3.1.
wt. parts plus clay 30 wt. parts. Example 14"... EVA, VA=16%, MI=3,DCP= .(lo X, 1.5%..... 1.1] 4.3.
2%, A.R.=0.2%. Example 15..... Composition of Example 14: 100 ..do X, 1.6%... 1. 0 3.0.
wt. parts plus talc 30 wt. parts. Comparison 1... Same as Refereneel ..do DCP, 1.0%. 0.5 More than 5, and left on insulat- 1111,! ayer. Comparison 2 ..d0 lo D01, 5.0% 0. 5 D0. Comparison 3 ..do Same as Example 2 except EVA X, 1.0%..... 0.5 Do.
was replaced with l) lD-(ilGJ.
Example 16 ..do EVA, \'A=35%, Ml=l X, 1%..... 0.5 3.5. Example 17. .(lo. EVA, \"A=50%, X, 0.5 3.5. Example 18 ..(lo EVA, VA=50%, IM=60 X,1%...... 0.5 2.
*-1 EVA=Eth1ene vinyl acetate copolymer; \'A=amount ofvinyl acetate in copolymer.
ing layer is less than 0.1 mm, the layer, when stripped, will easily tear off, and it should be desirably more than 0.1 mm.
Thus, only when an ethylene vinylacetate copolymer containing 25-55 wt. tpercent vinyl acetate, and a range in excess of 0.2 bu less than 6 wt. parts, of 2,
It was also confirmed when said crosslinking agent,
2,5-di-methyl-2',5-di(tertiary butyl peroxy)-hexinc-3 is .added to a high molecular polymer other than ethylenevinylacetatc copolymer, excellent effects can not be expected. Only by the use of the composition of the invention, can the semiconductive layer, which can be effectively stripped off, be obtained. The amount of carbon black is not particularly limited, but if it is less than 25 percent, the electric conductivity as required in the invention can not be obtained while an amount exceeding 70 percent will deteriorate the mechanical proparties of the conductive layer, itself, impairing workability thereof, so that a range of 25-70 percent is desirable.
The present invention can be, of course, applied to electric cables having a insulating layer whose principal component is crosslinkcd polyethylene or crosslinked polyethylene copolymer, irrespective of the size and use of the cable.
"- 5 l)ll)616U=Ethyleneethylaerylate copolynn-rof UCC, USA.
What we claim is:
1. An insulated electric cable having an external semiconductive layer extruded over the insulating layer thereof comprising a cable insulated primarily with an insulation selected from the group consisting of crosslinked polyethylene and crosslinked polyethylene copolymer, and an external semiconductivc layer consisting of an ethylene vinyl acetate copolymer containing 25-55 wt. percent vinyl acetate and 2,5-dimethyl- 2,5'-di(tertiary-butyl/peroxy)-hexine-3 and an inclusion of an electric conductive substance.
2. An insulated cable as claimed in claim 1, wherein the insulating layer is made of crosslinked polyethylene.
3. An insulated cable as claimed in claim 1, wherein the insulating layer is made of a crosslinked polymer consisting of a copolymer of ethylene and vinyl acetate.
4. An insulated cable as claimed in claim 1, wherein inorganic filler is added to the insulating layer thereof.
5. An insulated cable as claimed in claim 1, wherein a range, in excess of 0.2 but less than 6 wt. parts, of 2,5- dimethyl-2',5'-di-(tertiary butyl/peroxy)-hexine-3, based on wt. parts of said ethylene vinyl acetate copolymer is contained in the semiconductive layer.
6. An insulated cable as claimed in claim 1, wherein the thickness of the external semiconductive layer is more than 0.1 mm.
7. An insulated cable as claimed in claim 1, wherein 25-70 wt. parts of carbon black based on 100 wt. parts of said copolymer is contained in the external semiconductive layer.
Claims (6)
1. An insulated electric cable having an external semiconductive layer extruded over the insulating layer thereof comprising a cable insulated primarily with an insulation selected from the group consisting of crosslinked polyethylene and crosslinked polyethylene copolymer, and an external semiconductive layer consisting of an ethylene vinyl acetate copolymer containing 25-55 wt. percent vinyl acetate and 2,5-dimethyl-2'',5''-di(tertiary-butyl/peroxy)-hexine-3 and an inclusion of an electric conductive substance.
2. An insulated cable as claimed in claim 1, wherein the insulating layer is made of crosslinked polyethylene.
3. An insulated cable as claimed in claim 1, wherein the insulating layer is made of a crosslinked polymer consisting of a copolymer of ethylene and vinyl acetate.
4. An insulated cable as claimed in claim 1, wherein inorganic filler is added to the insulating layer thereof.
5. An insulated cable as claimed in claim 1, wherein a range, in excess of 0.2 but less than 6 wt. parts, of 2,5-dimethyl-2'',5''-di-(tertiary butyl/peroxy)-hexine-3, based on 100 wt. parts of said ethylene vinyl acetate copolymer is contained in the semiconductive layer.
6. An insulated cable as claimed in claim 1, wherein the thickness of the external semiconductive layer is more than 0.1 mm.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US7791870A | 1970-10-05 | 1970-10-05 |
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|---|---|
| US3719769A true US3719769A (en) | 1973-03-06 |
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| US00077918A Expired - Lifetime US3719769A (en) | 1970-10-05 | 1970-10-05 | Insulated electric cable having an external semiconductive layer |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3950605A (en) * | 1969-12-05 | 1976-04-13 | Nitto Electric Industrial Co., Ltd. | Metal foil-plastic laminate and method of preparing the same |
| US3962517A (en) * | 1974-06-12 | 1976-06-08 | Bicc Limited | Electric cables |
| FR2310618A1 (en) * | 1975-05-07 | 1976-12-03 | Union Carbide Corp | VULCANIZABLE, PELABLE COMPOSITION FOR INSULATING ELECTRICAL CONDUCTORS |
| US4085249A (en) * | 1974-12-20 | 1978-04-18 | Nippon Unicar Company Limited | Semiconductive composition having controlled strippability |
| US4226823A (en) * | 1976-06-10 | 1980-10-07 | Asea Aktiebolag | Method of applying a strippable outer semiconductive layer on an insulated cable conductor |
| US4246142A (en) * | 1976-10-04 | 1981-01-20 | Union Carbide Corporation | Vulcanizable semi-conductive compositions |
| US4370517A (en) * | 1977-12-29 | 1983-01-25 | Hitachi Cable Limited | Polyolefin compositions for electrical insulation |
| EP0111393A1 (en) * | 1982-11-09 | 1984-06-20 | Sumitomo Electric Industries Limited | Cross linked polyethylene-insulated cable |
| US4533789A (en) * | 1983-02-11 | 1985-08-06 | Cable Technology Laboratories, Inc. | High voltage electric power cable with thermal expansion accommodation |
| US4571450A (en) * | 1983-12-27 | 1986-02-18 | Essex Group, Inc. | Moisture impervious power cable and conduit system |
| US5180885A (en) * | 1990-04-12 | 1993-01-19 | Dinesh Shah | Electrostatic charge dissipating electrical wire assembly and process for using same |
| US5331606A (en) * | 1992-05-29 | 1994-07-19 | Western Atlas International, Inc. | Static dissipating data cable and seismic apparatus |
| US5426264A (en) * | 1994-01-18 | 1995-06-20 | Baker Hughes Incorporated | Cross-linked polyethylene cable insulation |
| US6337367B1 (en) | 2000-07-11 | 2002-01-08 | Pirelli Cables And Systems, Llc | Non-shielded, track resistant, silane crosslinkable insulation, methods of making same and cables jacketed therewith |
| US20190164670A1 (en) * | 2016-07-27 | 2019-05-30 | Schlumberger Technology Corporation | Armored submersible power cable |
-
1970
- 1970-10-05 US US00077918A patent/US3719769A/en not_active Expired - Lifetime
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3950605A (en) * | 1969-12-05 | 1976-04-13 | Nitto Electric Industrial Co., Ltd. | Metal foil-plastic laminate and method of preparing the same |
| US3962517A (en) * | 1974-06-12 | 1976-06-08 | Bicc Limited | Electric cables |
| US4085249A (en) * | 1974-12-20 | 1978-04-18 | Nippon Unicar Company Limited | Semiconductive composition having controlled strippability |
| FR2310618A1 (en) * | 1975-05-07 | 1976-12-03 | Union Carbide Corp | VULCANIZABLE, PELABLE COMPOSITION FOR INSULATING ELECTRICAL CONDUCTORS |
| US4226823A (en) * | 1976-06-10 | 1980-10-07 | Asea Aktiebolag | Method of applying a strippable outer semiconductive layer on an insulated cable conductor |
| US4246142A (en) * | 1976-10-04 | 1981-01-20 | Union Carbide Corporation | Vulcanizable semi-conductive compositions |
| US4370517A (en) * | 1977-12-29 | 1983-01-25 | Hitachi Cable Limited | Polyolefin compositions for electrical insulation |
| US4894284A (en) * | 1982-11-09 | 1990-01-16 | Sumitomo Electric Industries, Ltd. | Cross-linked polyethylene-insulated cable |
| EP0111393A1 (en) * | 1982-11-09 | 1984-06-20 | Sumitomo Electric Industries Limited | Cross linked polyethylene-insulated cable |
| US4533789A (en) * | 1983-02-11 | 1985-08-06 | Cable Technology Laboratories, Inc. | High voltage electric power cable with thermal expansion accommodation |
| US4571450A (en) * | 1983-12-27 | 1986-02-18 | Essex Group, Inc. | Moisture impervious power cable and conduit system |
| US5180885A (en) * | 1990-04-12 | 1993-01-19 | Dinesh Shah | Electrostatic charge dissipating electrical wire assembly and process for using same |
| US5331606A (en) * | 1992-05-29 | 1994-07-19 | Western Atlas International, Inc. | Static dissipating data cable and seismic apparatus |
| AU664743B2 (en) * | 1992-05-29 | 1995-11-30 | I/O Exploration Products (U.S.A.) Inc. | Static dissipating data cable |
| US5426264A (en) * | 1994-01-18 | 1995-06-20 | Baker Hughes Incorporated | Cross-linked polyethylene cable insulation |
| US6337367B1 (en) | 2000-07-11 | 2002-01-08 | Pirelli Cables And Systems, Llc | Non-shielded, track resistant, silane crosslinkable insulation, methods of making same and cables jacketed therewith |
| US20190164670A1 (en) * | 2016-07-27 | 2019-05-30 | Schlumberger Technology Corporation | Armored submersible power cable |
| US11646134B2 (en) * | 2016-07-27 | 2023-05-09 | Schlumberger Technology Corporation | Armored submersible power cable |
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