GB2172895A - Shrink tubing for end closures of electric cables - Google Patents
Shrink tubing for end closures of electric cables Download PDFInfo
- Publication number
- GB2172895A GB2172895A GB08607237A GB8607237A GB2172895A GB 2172895 A GB2172895 A GB 2172895A GB 08607237 A GB08607237 A GB 08607237A GB 8607237 A GB8607237 A GB 8607237A GB 2172895 A GB2172895 A GB 2172895A
- Authority
- GB
- United Kingdom
- Prior art keywords
- shrink tubing
- tubing
- additives
- crosslinking
- shrink
- 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.)
- Granted
Links
- 239000000654 additive Substances 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 12
- 229910044991 metal oxide Inorganic materials 0.000 claims abstract description 6
- 150000004706 metal oxides Chemical class 0.000 claims abstract description 6
- 238000009413 insulation Methods 0.000 claims abstract description 5
- 150000001247 metal acetylides Chemical class 0.000 claims abstract description 3
- 150000004756 silanes Chemical class 0.000 claims abstract description 3
- 238000004132 cross linking Methods 0.000 claims description 29
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 18
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 8
- 229920005601 base polymer Polymers 0.000 claims description 8
- 229910000077 silane Inorganic materials 0.000 claims description 8
- 239000002861 polymer material Substances 0.000 claims description 7
- 239000003054 catalyst Substances 0.000 claims description 5
- 238000007493 shaping process Methods 0.000 claims description 5
- 229920000642 polymer Polymers 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 229920006037 cross link polymer Polymers 0.000 claims description 2
- 238000010348 incorporation Methods 0.000 claims description 2
- 239000011159 matrix material Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 abstract description 3
- 239000005977 Ethylene Substances 0.000 abstract description 3
- 229920001577 copolymer Polymers 0.000 abstract description 3
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 abstract 1
- 150000002978 peroxides Chemical class 0.000 description 11
- 239000000203 mixture Substances 0.000 description 9
- 239000004615 ingredient Substances 0.000 description 6
- 229920001038 ethylene copolymer Polymers 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 239000004594 Masterbatch (MB) Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 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 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
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
- H01B3/18—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
- B29C61/003—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor characterised by the choice of material
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L43/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing boron, silicon, phosphorus, selenium, tellurium or a metal; Compositions of derivatives of such polymers
- C08L43/04—Homopolymers or copolymers of monomers containing silicon
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/02—Cable terminations
- H02G15/06—Cable terminating boxes, frames or other structures
- H02G15/064—Cable terminating boxes, frames or other structures with devices for relieving electrical stress
- H02G15/068—Cable terminating boxes, frames or other structures with devices for relieving electrical stress connected to the cable shield only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
- B29K2023/04—Polymers of ethylene
- B29K2023/06—PE, i.e. polyethylene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2096/00—Use of specified macromolecular materials not provided for in a single one of main groups B29K2001/00 - B29K2095/00, as moulding material
- B29K2096/02—Graft polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
- B29K2105/16—Fillers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/24—Condition, form or state of moulded material or of the material to be shaped crosslinked or vulcanised
Abstract
Shrink tubing consisting of a polymeric material which, after one or more silane compounds have been grafted on, is crosslinked by the action of moisture, and into which such compounds as metal oxides, carbides and the like have been incorporated as tracking resistance additives, is used as non-tracking insulation on end closures for electric high-tension cables. The base polymeric material may be an ethylene/vinyl acetate or ethylene/acrylate copolymer.
Description
SPECIFICATION
Shrink tubing for end closures
This invention relates to a non-tracking or tracking-resistant shrink tubing, i.e. a shrink tubing having resistance to the formation of unwanted electrically conductive paths on its surface. Such tubing is useful, for example, as an insulating tubing on end closures for electric high-tension cables.
An end closure for high-tension cables is already known (German Utility Model 6,609,658), wherein, to control the electric field, a shrink tubing of a conductive material has been applied at the cable end. This "control" tubing is usually covered by an insulating shrink tubing (US Patent Specification 3,210,460, EP-A 0,121,986), and this is more and more being required to possess tracking resistance.
Non-tracking articles have hitherto been produced by preparing compositions of the appropriate ingredients in one or more compounding steps and shaping them by extrusion or injection-moulding to give the desired product.
To widen the usable temperature range, crosslinking of the composition may be carried out; according to current practice, this may be cross-linking by peroxides or crosslinking by radiation. Apart from the question of the usable temperature range, however, crosslinking is a technically appropriate preliminary to heat-shrinking.
In crosslinking by peroxides, the chains of the polymer macromolecules are linked directly as a result of free-radical initiation by the added peroxide. For the application considered here, however, this does have the following disadvantages: (1) the initial reaction requires elevated temperatures, well above 1 60 C, but at such temperatures the additives necessary for improving tracking resistance can be partially decomposed or transformed; (2) metal oxides containing water of crystallization are frequently used in the peroxide crosslinkable compositions, and these oxides can at least partially give up their water at the temperatures mentioned.
Shrink articles which are to be prepared by an "open" procedure, for example the extrusion of tubing, can hardly be crosslinked at all by peroxides. Thus the absence of external pressure in an "open" procedure means that cavities and cracks can form in the hot extrudate, these being due to expanding decomposition products of the peroxide. In addition, even the problem of handling the still uncrosslinked extrudate at the temperatures in question, while maintaining its shape, has not been solved.
In crosslinking by radiation, the above-mentioned disadvantages of crosslinking by peroxides are largely avoided, and non-tracking shrink articles have therefore been produced by this method. Nevertheless, disadvantages arise here too, which sometimes can lead to a substantial deterioration in quality. Thus a component shaped by extrusion or injection-moulding will be irradiated, in crosslinking by radiation, on its outer accessible sides, but the energy delivered (which, to reduce losses, is usually sharply focussed) will give merely a depth-dependent crosslinking density, the crosslinking density decreasing from the outside to the inside. It may also be noted that the depth of penetration of electron beams is limited for certain technical reasons.Furthermore, with articles of complicated shape, focussing causes a further disadvantage, since shadow areas are formed by any prominent raises, bulges, ribs and the like. If a compensation is attempted by repeated rotation and turning of the article while it is being irradiated, however, the problem arises that other parts of the article are irradiated too often and are hence over-crosslinked. Thus a completely homogeneous crosslinking density in the entire irradiated region of the article is not achievable.
It is therefore an object of the present invention to enable the desired tracking resistance under high-tension conditions, together with substantially uniform crosslinking density, to be obtained with an article of any external shape.
The present invention provides shrink tubing derived from a polymer material which, following the grafting on of one or more silane compounds, has been made crosslinkable under the action of moisture, the shrink tubing being suitable for use as a non-tracking insulation on terminations or connecting sleeves for electric cables, the material of which the shrink tubing is composed being characterised in that the additives which produce the tracking resistance of the material are individually or in combination bound into a crosslinked polymer matrix which is substantially uniformly crosslinked over the length of the tubing and over the cross-section of the tubing. The additives which produce the tracking resistance of the material may for example comprise metal oxides and/or metal carbides.The substantially uniform crosslinking makes for substantially uniform shrinking back of the shrink article when heat is supplied, and the binding in of the additives specified favours a uniform distribution of the additive particles, which in turn favours the desired tracking resistance in the final shrunk state of the shrink tubing. An improvement in electrical properties is thus to be expected from the present technique using moisture crosslinking, since the distribution of the additives per unit of volume, established during the shaping of the shrink articles, changes neither in the enlargement step following crosslinking nor in the final shrinking step.
In carrying out the invention, it is has proved to be advantageous if the additives comprise a combination of hydrated aluminium oxide and of iron oxide, advantageously in proportions of 30 to 80 parts by weight of hydrated aluminium oxide and 3 to 7 parts by weight of iron oxide, per 100 parts by weight of polymer. The final shrink tubing will suitably have, for the desired tracking resistance, an electrical resistance of at least 1012 ohm x cm. The production of the shrink tubing, and more particularly its extrusion as well as the steps of crosslinking and of enlargement after heat has been supplied, can be accomplished without problems.
For the preparation of shrink tubing according to the invention, the procedure is advantageously one wherein initially the base material is mixed with the silane component, the silane component is thereafter grafted on to the base polymer, the additives are incorporated into the grafted base polymer material thus prepared and homogeneously distributed therein, and thereafter the material is shaped into the form of tubing and exposed to moisture for the purpose of crosslinking. The present invention is based on the proposition that the base polymer must first be rendered crosslinkable, in order to ensure uniform crosslinking subsequently, even with differing cross-sectional shapes, before the additives affording tracking resistance are admixed into this material which is to undergo crosslinking.As for the above-mentioned formation of blisters, voids or cracks due to peroxide decomposition, these problems do not arise in the process of the invention, which does not require the quantities of peroxide associated therewith.
Further improvements in the quality of the final product can be obtained if the incorporation of the additives into the base polymer material grafted with the silane component is carried out at temperatures between 1000 and 140 C.
It is also advantageous if the crosslinking catalyst for the crosslinking under the action of moisture is only incorporated immediately before the shaping of the crosslinking tubing. Premature crosslinking, after the addition of the metal oxides, hydrates or the like, can by this means be avoided.
The invention will be explained in more detail by reference to the Example which follows and the illustrative embodiment shown in the single Figure of the accompanying drawing.
Example
The following ingredients are used.
Parts by weight (A)
Ethylene copolymer (comonomer* proportion about 20%) 100
Vinyitrimethoxysilane 1.7
Peroxide (suitably dicumyl peroxide) 0.006 *Examples of the comonomers which, with ethylene, may be used in producing the ethylene copolymers of formulations A, B and C of this Example are acetate monomers (e.g. vinyl acetate) and also acrylate monomers.
(B)
Ethylene copolymer (comonomer proportion about 30%) 20
Hydrated aluminium oxide (Martinal OL 104 C from Martinwerke) 42
Iron oxide (foe304) 5
Stabilizer (Anox HB) 0.5 (C) Ethylene copolymer (comonomer proportion about 15%) 100
Catalyst (Naftovin S) 0.85
In the preparation of the non-tracking shrink tubing, the three ingredients listed at A, i.e. the "20%" copolymer and the silane and the peroxide (dissolved therein), are introduced into the feed hopper of a "grafting" extruder, and the silane is grafted on to the ethylene copolymer, which is thus rendered crosslinkable. The base material so treated is extruded and granulated.
Separately, a highly concentrated mixture (masterbatch) is prepared which contains the ingredients listed at B. These include the hydrated aluminium oxide and iron oxide employed as additives for improving the tracking resistance. An appropriate type of kneader is advantageously used for mixing together these ingredients.
A masterbatch according to C, which contains the crosslinking catalyst masterbatched in the "152%" copolymer, is also prepared. This too is advantageously prepared on a kneader.
After the crosslinkable base mixture (A) has been granulated, the granules are mixed with the highly concentrated mixture of the ingredients B, for example in a kneader or equivalent mixing equipment, and the mixture is then fed to the feed hopper of an extruder for the continuous production of tubing The mixture according to C is introduced, at the earliest, in the shaping extruder, the crosslinking catalyst being distributed sufficiently homogeneously during the mixing and homogenizing phase in the extruder.
Non-tracking shrink tubing produced in this way can then, after crosslinking by the action of moisture, be expanded in the usual manner while applying heat, and, by cooling in the expanded state, can be "frozen" in this state. It can thereafter be stored until it is to be shrunk on in the desired position.
Such non-tracking shrink tubing is shown in the Figure; this is tubing for an end closure on an electric high-tension cable.
In the Figure, the conductor 1 of the high-tension cable is surrounded by insulation 2, for example of a crosslinked polyethylene, and an inner conductor layer 3 is provided between the conductor surface and the insulation 2. There is a screening 4, which may, for example, be a conductive fabric tape wound up helically with overlapping, with a copper tape located on top, or an extruded conductive layer.
To produce a voltage drop in the longitudinal direction through capacitative currents passing into the cable radially during operation, and hence to reduce the field strength in this region, the conductive shrink tubing 5 (control tubing) shrunk on to the trimmed cable end is used. This control tubing is covered by non-tracking shrink tubing 6 according to the present invention, which projects beyond the control tubing 5 and also extends over the shortened cable sheath 7.
Claims (12)
1. Shrink tubing derived from a polymer material which, following the grafting on of one or more silane compounds, has been made crosslinkable under the action of moisture, the shrink tubing being suitable for use as a non-tracking insulation on terminations or connecting sleeves for electric cables, the material of which the shrink tubing is composed being characterised in that the additives which produce the tracking resistance of the material are individually or in combination bound into a crosslinked polymer matrix which is substantially uniformly crosslinked over the length of the tubing and over the cross-section of the tubing.
2. Shrink tubing according to claim 1, wherein the said additives comprise metal oxides and/or metal carbides.
3. Shrink tubing according to claim 1 or 2, containing metal oxides as additives, wherein the additives comprise a combination of hydrated aluminium oxide and of iron oxide.
4. Shrink tubing according to claim 3, wherein the hydrated aluminium oxide fraction makes up 3080 parts by weight and the iron oxide fraction makes up 3-7 parts by weight, per 100 parts by weight of polymer.
5. Shrink tubing according to any of claims 1 to 4, having an electrical resistance of at least 1012 ohm x cm.
6. Process for the preparation of a shrink tubing according to claim 1, wherein initially the base polymer material is mixed with the silane component, the silane component is thereafter grafted on to the base polymer, the additives are incorporated into the grafted base polymer material thus prepared and homogeneously distributed therein, and thereafter the material is shaped into the form of tubing and exposed to moisture for the purpose of crosslinking.
7. Process according to claim 6, wherein the incorporation of the additives into the base polymer material grafted with the silane component is carried out at temperatures between 1000 and 1 40 C.
8. Process according to claim 6 or 7, wherein the crosslinking catalyst for the crosslinking under the action of moisture is only incorporated immediately before the shaping of the crosslinkable tubing.
9. Process according to claim 6, substantially as described in the foregoing Example.
10. Shrink tubing prepared by a process as claimed in any of claims 6 to 9.
11. End closure employing a shrink tubing according to any of claims 1 to 5, or claim 10, wherein one or more pieces of field-controlling shrink tubing have been applied over a trimmed cable end and the non-tracking shrink tubing, crosslinked by the action of moisture, has been shrunk on thereover.
12. End closure as claimed in claim 11, substantially as described with reference to the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19853511299 DE3511299A1 (en) | 1985-03-28 | 1985-03-28 | CREECH-RESISTANT SHRINK TUBE FOR END TERMINALS |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8607237D0 GB8607237D0 (en) | 1986-04-30 |
| GB2172895A true GB2172895A (en) | 1986-10-01 |
| GB2172895B GB2172895B (en) | 1988-07-20 |
Family
ID=6266601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08607237A Expired GB2172895B (en) | 1985-03-28 | 1986-03-24 | Shrink tubing for end closures of electric cables |
Country Status (11)
| Country | Link |
|---|---|
| AT (1) | AT399620B (en) |
| BE (1) | BE904497A (en) |
| CH (1) | CH673030A5 (en) |
| DE (1) | DE3511299A1 (en) |
| DK (1) | DK164344C (en) |
| ES (1) | ES8707033A1 (en) |
| FR (1) | FR2579819B1 (en) |
| GB (1) | GB2172895B (en) |
| IT (1) | IT1191872B (en) |
| NL (1) | NL191915C (en) |
| SE (1) | SE467849B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1103986A1 (en) * | 1999-11-24 | 2001-05-30 | ShawCor Ltd. | Tracking resistant, electrical-insulating material containing silane-modified polyolefins |
| CN103489524A (en) * | 2013-08-27 | 2014-01-01 | 江苏鑫丰塑业有限公司 | Improved silane crosslinking cable |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1286460A (en) * | 1968-12-20 | 1972-08-23 | Dow Corning Ltd | Improvements in or relating to polymers |
| GB1337951A (en) * | 1969-10-17 | 1973-11-21 | Raychem Ltd | High voltage insulating materials |
| GB1337952A (en) * | 1969-10-17 | 1973-11-21 | Raychem Ltd | High voltage insulating materials |
| GB1357549A (en) * | 1971-11-12 | 1974-06-26 | Dow Corning Ltd | Cross-linking of polymers |
| GB1486952A (en) * | 1974-03-08 | 1977-09-28 | Kabel Metallwerke Ghh | Process for the preparation of a product derived from a polymeric material |
| GB1495850A (en) * | 1974-12-12 | 1977-12-21 | Kabel Metallwerke Ghh | Process and apparatus for the production of products comprising a cross-linked(co)polymer or elastomer |
| GB1514500A (en) * | 1976-12-10 | 1978-06-14 | Bicc Ltd | Manufacture of heat-recoverable articles |
| GB2002395A (en) * | 1977-08-10 | 1979-02-21 | Kabel Metallwerke Ghh | Moisture-crosslinkable rubbery compositions and their use for covering linearly extended materials |
| GB2039513A (en) * | 1978-11-13 | 1980-08-13 | Mitsubishi Petrochemical Co | Process for producing electric conductors coated with crosslinked polyethylene resin |
| GB1575465A (en) * | 1976-01-16 | 1980-09-24 | Raychem Corp | Insulating compositions containing phosphorus compounds |
| GB1581041A (en) * | 1977-08-02 | 1980-12-10 | Bicc Ltd | Manufacture of extruded products of silane-crosslinked polymers |
| GB2084587A (en) * | 1980-09-17 | 1982-04-15 | Raychem Ltd | Production of heat shrink polymeric articles |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3210460A (en) * | 1963-07-15 | 1965-10-05 | Westinghouse Electric Corp | Terminating means for shielded electrical conductors |
| DE6609658U (en) * | 1968-03-30 | 1972-08-03 | Kabel Metallwerke Ghh | END TERMINATION FOR HIGH VOLTAGE CABLES AND LINES. |
| GB1434719A (en) * | 1972-09-01 | 1976-05-05 | Raychem Ltd | Heat recoverable products |
| US4328323A (en) * | 1979-08-29 | 1982-05-04 | Union Carbide Corporation | Production of silane modified copolymers of alkylene-alkyl acrylates |
| FR2460163A1 (en) * | 1979-07-03 | 1981-01-23 | Intrama Sa | DEVICE FOR AUTOMATICALLY DEPOSITING A PELLET SUBSTANCE ON A SURFACE |
| EP0031868A3 (en) * | 1979-10-08 | 1981-07-22 | kabelmetal electro GmbH | Process for preparing shrinkable articles, apparatus for carrying out this process and articles thus obtained |
| FR2518837B1 (en) * | 1981-12-18 | 1985-08-09 | Fabrication Cables Elect Cie G | PROCESS FOR PREPARING THE END OF HIGH-VOLTAGE RADIAL FIELD ELECTRICAL CABLES AND ELECTRICAL CABLES THUS OBTAINED |
| GB8303462D0 (en) * | 1983-02-08 | 1983-03-16 | Raychem Gmbh | Electrical stress control |
-
1985
- 1985-03-28 DE DE19853511299 patent/DE3511299A1/en active Granted
-
1986
- 1986-02-10 FR FR868601753A patent/FR2579819B1/en not_active Expired - Lifetime
- 1986-03-11 ES ES552895A patent/ES8707033A1/en not_active Expired
- 1986-03-18 CH CH1082/86A patent/CH673030A5/de not_active IP Right Cessation
- 1986-03-24 GB GB08607237A patent/GB2172895B/en not_active Expired
- 1986-03-24 DK DK135786A patent/DK164344C/en not_active IP Right Cessation
- 1986-03-26 BE BE0/216461A patent/BE904497A/en not_active IP Right Cessation
- 1986-03-26 AT AT0080886A patent/AT399620B/en not_active IP Right Cessation
- 1986-03-26 IT IT47821/86A patent/IT1191872B/en active
- 1986-03-27 SE SE8601424A patent/SE467849B/en not_active IP Right Cessation
- 1986-03-27 NL NL8600803A patent/NL191915C/en not_active IP Right Cessation
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1286460A (en) * | 1968-12-20 | 1972-08-23 | Dow Corning Ltd | Improvements in or relating to polymers |
| GB1337951A (en) * | 1969-10-17 | 1973-11-21 | Raychem Ltd | High voltage insulating materials |
| GB1337952A (en) * | 1969-10-17 | 1973-11-21 | Raychem Ltd | High voltage insulating materials |
| GB1357549A (en) * | 1971-11-12 | 1974-06-26 | Dow Corning Ltd | Cross-linking of polymers |
| GB1486952A (en) * | 1974-03-08 | 1977-09-28 | Kabel Metallwerke Ghh | Process for the preparation of a product derived from a polymeric material |
| GB1495850A (en) * | 1974-12-12 | 1977-12-21 | Kabel Metallwerke Ghh | Process and apparatus for the production of products comprising a cross-linked(co)polymer or elastomer |
| GB1575465A (en) * | 1976-01-16 | 1980-09-24 | Raychem Corp | Insulating compositions containing phosphorus compounds |
| GB1514500A (en) * | 1976-12-10 | 1978-06-14 | Bicc Ltd | Manufacture of heat-recoverable articles |
| GB1581041A (en) * | 1977-08-02 | 1980-12-10 | Bicc Ltd | Manufacture of extruded products of silane-crosslinked polymers |
| GB2002395A (en) * | 1977-08-10 | 1979-02-21 | Kabel Metallwerke Ghh | Moisture-crosslinkable rubbery compositions and their use for covering linearly extended materials |
| GB2039513A (en) * | 1978-11-13 | 1980-08-13 | Mitsubishi Petrochemical Co | Process for producing electric conductors coated with crosslinked polyethylene resin |
| GB2084587A (en) * | 1980-09-17 | 1982-04-15 | Raychem Ltd | Production of heat shrink polymeric articles |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1103986A1 (en) * | 1999-11-24 | 2001-05-30 | ShawCor Ltd. | Tracking resistant, electrical-insulating material containing silane-modified polyolefins |
| US6468583B1 (en) | 1999-11-24 | 2002-10-22 | Shawcor Ltd. | Tracking-resistant, electrical-insulating material containing silane-modified polyolefins |
| CN103489524A (en) * | 2013-08-27 | 2014-01-01 | 江苏鑫丰塑业有限公司 | Improved silane crosslinking cable |
Also Published As
| Publication number | Publication date |
|---|---|
| NL191915C (en) | 1996-10-04 |
| IT8647821A0 (en) | 1986-03-26 |
| SE467849B (en) | 1992-09-21 |
| ES552895A0 (en) | 1987-07-01 |
| CH673030A5 (en) | 1990-01-31 |
| DK164344C (en) | 1992-11-30 |
| SE8601424D0 (en) | 1986-03-27 |
| DE3511299A1 (en) | 1986-10-09 |
| NL191915B (en) | 1996-06-03 |
| DE3511299C2 (en) | 1993-08-19 |
| ATA80886A (en) | 1994-10-15 |
| IT1191872B (en) | 1988-03-23 |
| DK135786D0 (en) | 1986-03-24 |
| SE8601424L (en) | 1986-09-29 |
| DK164344B (en) | 1992-06-09 |
| ES8707033A1 (en) | 1987-07-01 |
| AT399620B (en) | 1995-06-26 |
| BE904497A (en) | 1986-07-16 |
| FR2579819A1 (en) | 1986-10-03 |
| NL8600803A (en) | 1986-10-16 |
| DK135786A (en) | 1986-09-29 |
| GB8607237D0 (en) | 1986-04-30 |
| GB2172895B (en) | 1988-07-20 |
| FR2579819B1 (en) | 1990-01-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2128194B1 (en) | Strippable semiconductive composition comprising low melt temperature polyolefin | |
| US5164133A (en) | Process for the production of molded article having positive temperature coefficient characteristics | |
| EP2215162B1 (en) | Silane-functionalised polyolefin compositions, products thereof and preparation processes thereof for wire and cable applications | |
| CA2524252C (en) | Improved strippable cable shield compositions | |
| EP2128195A1 (en) | Strippable semiconductive composition comprising low melt temperature polyolefin | |
| JPS6360062B2 (en) | ||
| CA2536948C (en) | Strippable semiconductive shield and compositions therefor | |
| CN111051398A (en) | Reactive compounding of ethylene-vinyl acetate | |
| US4276251A (en) | Power and control cables having flexible polyolefin insulation | |
| WO2009056407A1 (en) | Silane-functionalised polyolefin compositions, products thereof and preparation processes thereof for wire and cable applications | |
| GB2172895A (en) | Shrink tubing for end closures of electric cables | |
| EP1148518B1 (en) | A process for producing cross-linked polyethylene coated conducting wires | |
| JP3699514B2 (en) | Cross-linked polyethylene insulated power cable and method for producing the same | |
| US4915889A (en) | Method of producing an electrically semi-conducting, strippable plastics mixture | |
| JP3428388B2 (en) | DC cable | |
| CA1084696A (en) | Insulated electrical conductors | |
| GB2093043A (en) | Electric cables having flexible polyolefin insulation | |
| CA1160301A (en) | Power and control cables having flexible polyolefin insulation | |
| JPH0366766B2 (en) | ||
| JPS6210254B2 (en) | ||
| JP3244255B2 (en) | Semiconductive resin composition | |
| JPH10269855A (en) | Crosslinking polyethylene insulating wire or cable | |
| IE52086B1 (en) | Electric cables having flexible polyolefin insulation | |
| JPH01237113A (en) | Extrusion molding method for crosslinking ethylene-tetrafluoroethylene copolymer molded product | |
| JPH03156804A (en) | Semiconductor resin composition |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PE20 | Patent expired after termination of 20 years |
Effective date: 20060323 |