EP0892979B1 - Ethylenpolymer-zusammensetzung für electrische kabel - Google Patents

Ethylenpolymer-zusammensetzung für electrische kabel Download PDF

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Publication number
EP0892979B1
EP0892979B1 EP97917761A EP97917761A EP0892979B1 EP 0892979 B1 EP0892979 B1 EP 0892979B1 EP 97917761 A EP97917761 A EP 97917761A EP 97917761 A EP97917761 A EP 97917761A EP 0892979 B1 EP0892979 B1 EP 0892979B1
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EP
European Patent Office
Prior art keywords
cable
polymer
ethylene
percent
density
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
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EP97917761A
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English (en)
French (fr)
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EP0892979A1 (de
Inventor
Lawrence T. Kale
Trudy L. Iaccino
Kenneth E. Bow
Richard B. Mcada
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Dow Global Technologies LLC
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Dow Chemical Co
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—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
    • 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

Definitions

  • Another aspect of the present invention is a cable jacket comprising the polyethylene composition of the invention which has at least 10 percent, preferably at least 20 percent, more flexibility than a cable made using conventional heterogeneous linear ethylene polymer having about the same density as the inventive polyethylene composition.
  • the long chain branches are not the same as the short chain branches resulting from incorporation of the comonomer.
  • the short chain branches are six carbons in length, while the long chain branches for such a substantially linear ethylene/1-octene copolymer are at least seven carbons in length, but usually much longer than seven carbons.
  • m melt index measurement Another measurement useful in characterizing the molecular weight of the homogeneously branched substantially linear ethylene/ ⁇ -olefin interpolymers is conveniently indicated m melt index measurement according to ASTM D-1238, condition 190°C/10 kg (formerly know as "Condition (N)" and also known as I 10 ).
  • the ratio of the I 10 and I 2 melt index is the melt flow ratio and is designated as I 10 /I 2 .
  • the I 10 /I 2 ratio for the homogeneously branched linear ethylene/ ⁇ -olefin interpolymers is about 5.6.
  • the ethylene polymer to be combined with the homogeneously branched linear or substantially linear ethylene/ ⁇ -olefin interpolymer is a heterogeneously branched ethylene polymer, preferably a heterogeneously branched (for example, Ziegler polymerized) interpolymer of ethylene with at least one C 3 -C 20 ⁇ -olefin (for example, linear low density polyethylene (LLDPE)).
  • a heterogeneously branched (for example, Ziegler polymerized) interpolymer of ethylene with at least one C 3 -C 20 ⁇ -olefin for example, linear low density polyethylene (LLDPE)
  • compositions disclosed herein can be formed by any convenient method, including dry blending the individual components and subsequently melt mixing or by pre-melt mixing in a separate extruder (for example, a Banbury mixer, a Haake mixer, A Brabender internal mixer, or a twin screw extruder).
  • a separate extruder for example, a Banbury mixer, a Haake mixer, A Brabender internal mixer, or a twin screw extruder.
  • the composition of the present invention may be further fabricated into desired cable of the present invention by using any known fabrication method.
  • the composition of the present invention may be used not only for cable jacketing, but also cable insulation or any layer of a cable.
  • the composition described herein may be heated, melted, kneaded and extruded by a mono- or bi-axial extruder through an extrusion die such as a cross-head die so as to be applied onto a core substrate, and then it may be subjected to a cooling step, or the next coating step if desired. Multiple layers of polymers may be applied onto the core substrate if desired.
  • a core wrap 8 which may be a suitable plastic or other material.
  • a binder can be placed around core wrap 8 to hold it in position about core 2, a layer of conductive metal is placed about the core.
  • a thin aluminum layer 10 having a longitudinal seam 14 therein advantageously can be used for lightning protection and shielding. Longitudinal seam 14 is not required to be soldered or otherwise mechanically joined, a steel layer 20 having unsoldered overlapping edges 16 and 18 forming a longitudinal seam 17 is longitudinally wrapped about aluminum layer 10 to provide protection from mechanical forces such as abrasion. The use of an unsoldered seam 17 for steel layer 20 is possible, since the cable core 2 is waterproof.
  • a cable was produced by using polymer D, which is a currently available polyethylene (for example UCC 8864 by Union Carbide) having melt index of 0.76 g/10minutes, I 10 /I 2 of 12.3, density of 0.942 g/cm 3 , and M w /M n of 3.7, and no long chain branching.
  • Polymer D also contained 2.6 weight percent carbon black and about 400 ppm of a fluoroelastomer. The polymer was extruded onto cable as described in Example 1. Melt tension data and cable surface rating are reported in Table 1.
  • Circumferential tensile samples were cut perpendicular to the cable axis from the finished cables prepared as described above, and the notch (due to the metal overlap) was centered within the gauge length.
  • the test was carried out as described in ASTM D638 using Die V (5) (for example microtensile), with a 2.54 cm jaw separation and puling at 5.08 cmlminute. The results are reported in Table 3.
  • the jacket bond test was conducted according to ASTM D 4565 for cables with a bonded steel sheath.
  • a section of the cable jackets prepared as described above was removed by slitting the jacket longitudinally along the shield overlap.
  • the cable was ringed circumferentantially with a knife, flexed at the cut point to break the steel shield at the ring.
  • the metal sheath was opened, flattened, and the cable core was discarded.
  • the specimen strip was cut in the circumferential direction. Three strips having a width of 13 mm were cut for each strip.
  • the jacket was separated from the shield or armor only of a length sufficient to permit forming a tab of each sheath component.
  • Three specimens were tested for each cable sample at a crosshead speed of 50 mm / minute.
  • a room temperature bend test was conducted in a manner similar to ASTM 4565.
  • the cable samples were conditioned at 20°C for 4 hours prior to testing.
  • a cable sample was bent in the same manner as the cold bend test as described above, except the sample was bent around a mandrel having a diameter of 20 times the cable diameter.
  • the polymers used in the cable of the present invention were less notch sensitive than the polymers currently available in the industry (for example Polymer D and G), comparing at about same density, for example, Polymers B and C have the higher elongation at break than Polymer G, and polymers E and F have the higher elongation at break than Polymer D, at almost all temperatures.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Organic Insulating Materials (AREA)
  • Insulated Conductors (AREA)

Claims (8)

  1. Kabel der Kategorien 1, 2 oder 3, wie es durch ASTM D 1248 definiert ist, umfassend eine Mantelschicht umfassend eine Polyethylen-Zusammensetzung, dadurch gekennzeichnet, dass die Polyethylen-Zusammensetzung umfasst:
    (A) 25 bis 45 Gew.-% mindestens eines homogen verzweigten Ethylen/α-Olefin-Interpolymers, bezogen auf die Gesamtzusammensetzung, mit:
    (i) einer Dichte von 0,89 g/cm3 bis 0,94 g/cm3,
    (ii) einer Molekulargewichtsverteilung (Mw/Mn) von 1,8 bis weniger als 3,5,
    (iii) einem Schmelzindex, I2, von 0,001 g/10 min bis weniger als 0,5 g/10 min, und
    (iv) einem CDBI von größer als 50 Prozent,
    (B) mindestens 5 Gew.-% mindestens eines heterogen verzweigten Ethylen-Interpolymers oder linearen Ethylen-Homopolymers, bezogen auf die Gesamtzusammensetzung, mit einer Dichte von 0,9 g/cm3 bis 0,965 g/cm3,
       wobei der End-Schmelzindex, I2, der Polyethylen-Zusammensetzung in dem Kabelmantel im Bereich von 1 bis 50 g/10 Minuten liegt, die Polyethylen-Zusammensetzung eine Dichte von 0,945 g/cm3 oder mehr aufweist und der Kabelmantel einen Umformverfestigungsmodul, Gp, von größer als 1,6 MPa aufweist, wobei Gp gemäß folgender Gleichung berechnet wird: Gp = σ dr λ n -σ dr λ2 n -1λ n ,, worin λn und σdr das natürliche Ziehverhältnis bzw. die technische Ziehspannung darstellen, und eine verringerte Kerbempfindlichkeit von weniger als 55 % Dehnungsverlust, angegeben für einen gekerbten Kabelmantel, umfassend eine Polyethylen-Zusammensetzung und mit einer Dicke von 2,03 bis 2,29 mm (80-90 Mil), in Umfangsrichtung aufweist, verglichen mit einer ungekerbten Kabelmantel-Probe des Kabels, gemessen gemäß ASTM D 638 bei 23,9 °C unter Verwendung einer Matrize V (5) mit einer Backenseparation von 2,5 cm und einer Ziehrate von 5,08 cm pro Minute.
  2. Kabel nach Anspruch 1, wobei das mindestens eine homogen verzweigte Ethylen/α-Olefin-lnterpolymer aus Teil (A) in Anspruch 1 ein im Wesentlichen lineares Ethylen-Polymer mit Langkettenverzweigung oder ein lineares Ethylen-Polymer ohne Langkettenverzweigung ist.
  3. Kabel nach einem der vorhergehenden Ansprüche, wobei die Polyethylen-Zusammensetzung femer dadurch gekennzeichnet ist, dass sie ein Schmelzfluss-Verhältnis, I10/I2, von 7,0 bis 16,0 aufweist.
  4. Kabel nach einem der vorhergehenden Ansprüche, wobei das mindestens eine heterogen verzweigte Ethylen-Interpolymer mindestens ein Interpolymer von Ethylen mit mindestens einem C3-C20-α-Olefin ist.
  5. Kabel nach einem der vorhergehenden Ansprüche, umfassend eine Schicht einer Polyethylen-Zusammensetzung, dadurch gekennzeichnet, dass die Polyethylen-Zusammensetzung umfasst:
    (A) 40% mindestens eines Ethylen/α-Olefin-Interpolymers mit:
    (i) einer Dichte von 0,91 bis 0,92 g/cm3,
    (ii) einer Molekulargewichtsverteilung (Mw/Mn) von 2,
    (iii) einem Schmelzindex, I2, von 0,1 g/10 min, und
    (iv) einem CDBI von größer als 50 Prozent,
    (B) 60 Gew.-% mindestens eines heterogen verzweigten Ethylen/α-Olefin-Interpolymers, bezogen auf die Gesamtzusammensetzung, mit:
    (i) einer Dichte von 0,96 g/cm3,
    (ii) einem Schmelzindex, I2, von 6 g/10 min, und
    (iii) einem CDBI von weniger als 50 Prozent.
  6. Kabel nach Anspruch 1, wobei die Polyethylen-Zusammensetzung durch ein Verfahren hergestellt ist, das die Schritte umfasst:
    (i) Umsetzung, indem Ethylen und mindestens ein α-Olefin unter Lösungspolymerisationsbedingungen in mindestens einem Reaktor in Kontakt gebracht werden, um eine Lösung des mindestens einen homogen verzweigten Ethylen/α-Olefin-Interpolymers gemäß Anspruch 1 herzustellen,
    (ii) Umsetzung, indem Ethylen und mindestens ein α-Olefin unter Lösungspolymerisationsbedingungen in mindestens einem anderen Reaktor in Kontakt gebracht werden, um eine Lösung des mindestens einen heterogen verzweigten Ethylen-lnterpolymers gemäß Anspruch 1 herzustellen,
    (iii) Vereinigen der in Schritt (i) hergestellten Lösung des mindestens einen homogen verzweigten Ethylen/α-Olefin-Interpolymers und der in Schritt (ii) hergestellten Lösung des mindestens einen heterogen verzweigten Ethylen-Interpolymers, und
    (iv) Entfemen des Lösungsmittels von der Polymer-Lösung aus Schritt (iii) und Gewinnung der Polyethylen-Zusammensetzung.
  7. Kabel nach einem der vorhergehenden Ansprüche, wobei die Polyethylen-Zusammensetzung thermoplastisch und eine Platte ist, mit einer einzigen Kerbe und einer Dicke von 1,78-2,03 mm (70-80 Mil), hergestellt aus der Polyethylen-Zusammensetzung mit mindestens 100 Prozent Grenzzugdehnung, wobei die Kerbe eine Tiefe von 0,25 mm (10 Mil) oder mehr und einen Radius von 0,275 mm bis 0,55 mm aufweist.
  8. Kabel nach Anspruch 7, wobei die Grenzdehnung mindestens 200 Prozent beträgt.
EP97917761A 1996-04-10 1997-04-01 Ethylenpolymer-zusammensetzung für electrische kabel Expired - Lifetime EP0892979B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US63132096A 1996-04-10 1996-04-10
US631320 1996-04-10
PCT/US1997/005297 WO1997038424A1 (en) 1996-04-10 1997-04-01 Ethylene polymer composition for cable applications

Publications (2)

Publication Number Publication Date
EP0892979A1 EP0892979A1 (de) 1999-01-27
EP0892979B1 true EP0892979B1 (de) 2003-05-21

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EP97917761A Expired - Lifetime EP0892979B1 (de) 1996-04-10 1997-04-01 Ethylenpolymer-zusammensetzung für electrische kabel

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Country Link
EP (1) EP0892979B1 (de)
JP (1) JP2000508466A (de)
KR (1) KR20000005334A (de)
CN (1) CN1097825C (de)
AR (1) AR006572A1 (de)
AT (1) ATE241203T1 (de)
AU (1) AU2600797A (de)
BR (1) BR9709117A (de)
CA (1) CA2248654C (de)
DE (1) DE69722197T2 (de)
ES (1) ES2200173T3 (de)
ID (1) ID18484A (de)
NO (1) NO984715D0 (de)
TR (1) TR199802018T2 (de)
TW (1) TW374934B (de)
WO (1) WO1997038424A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3252085A1 (de) 2016-05-31 2017-12-06 Borealis AG Kabelmantel mit verbesserten eigenschaften
WO2019066516A1 (ko) * 2017-09-29 2019-04-04 주식회사 엘지화학 배관용 수지 조성물의 장기 내구성 예측 방법 및 배관용 수지에 사용되는 올레핀계 고분자
KR20190037945A (ko) * 2017-09-29 2019-04-08 주식회사 엘지화학 배관용 수지 조성물의 장기 내구성 예측 방법

Families Citing this family (15)

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Publication number Priority date Publication date Assignee Title
US6103658A (en) * 1997-03-10 2000-08-15 Eastman Chemical Company Olefin polymerization catalysts containing group 8-10 transition metals, processes employing such catalysts and polymers obtained therefrom
US6822062B2 (en) 1997-03-10 2004-11-23 Eastman Chemical Company Supported group 8-10 transition metal olefin polymerization catalysts
AU1241600A (en) * 1998-11-02 2000-05-22 Dupont Dow Elastomers L.L.C. Shear thinning ethylene/alpha-olefin interpolymers and their preparation
WO2001014922A1 (en) * 1999-08-23 2001-03-01 Pirelli Cavi E Sistemi S.P.A. Optical fiber cable with components having improved compatibility with waterblocking filling compositions
US6658185B2 (en) 1999-08-23 2003-12-02 Pirelli Cavi E Sistemi S.P.A. Optical fiber cable with components having improved compatibility with waterblocking filling compositions
JP4007877B2 (ja) 2002-08-07 2007-11-14 日本ジーイープラスチックス株式会社 ワイヤ・ケーブル被覆材用樹脂組成物
JP2004161929A (ja) 2002-11-14 2004-06-10 Ge Plastics Japan Ltd ワイヤ・ケーブル被覆材用樹脂組成物
US7517927B2 (en) 2004-01-07 2009-04-14 Sabic Innovative Plastics Ip B.V. Flexible poly(arylene ether)composition and articles thereof
IL180507A (en) 2007-01-02 2011-04-28 Teldor Wires And Cables Ltd Flexible and water and rodent cable that is especially suitable for use as an optical communication cable
US10811164B2 (en) * 2010-03-17 2020-10-20 Borealis Ag Polymer composition for W and C application with advantageous electrical properties
US10208196B2 (en) 2010-03-17 2019-02-19 Borealis Ag Polymer composition for W and C application with advantageous electrical properties
EP3485189A1 (de) * 2016-07-14 2019-05-22 SABIC Global Technologies B.V. Verfahren zur bestimmung der zeit bis zum sprödigkeitsbruch eines rohres aus polypropylen
KR102486846B1 (ko) * 2018-02-06 2023-01-10 주식회사 엘지화학 올레핀계 고분자
US12009121B2 (en) * 2018-07-25 2024-06-11 Dow Global Technologies Llc Coated conductor
CA3209174A1 (en) * 2021-02-24 2022-09-01 Wenke MIAO Colorable polymeric compositions exhibiting enhanced aging properties

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US3674915A (en) * 1971-06-01 1972-07-04 Phillips Petroleum Co Electrical cable having an ethylene-1-olefin copolymer as the dielectric material
KR100253826B1 (ko) * 1991-12-30 2000-04-15 그레이스 스티븐 에스. 에틸렌 공중합체의 중합방법
EP0572034A2 (de) * 1992-05-29 1993-12-01 Idemitsu Kosan Company Limited Ethylencopolymere und Ethylencopolymerzusammensetzung
ES2303346T3 (es) * 1992-09-15 2008-08-01 Dow Global Technologies Inc. Modificacion de impacto de materiales termoplasticos.
US5414040A (en) * 1992-09-15 1995-05-09 The Dow Chemical Company Formulated ethylene/α-olefin elastomeric compounds
DE69433347T2 (de) * 1993-01-29 2004-04-15 Dow Global Technologies, Inc., Midland Ethylen Copolymerisation

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3252085A1 (de) 2016-05-31 2017-12-06 Borealis AG Kabelmantel mit verbesserten eigenschaften
WO2017207483A1 (en) 2016-05-31 2017-12-07 Borealis Ag Jacket with improved properties
WO2019066516A1 (ko) * 2017-09-29 2019-04-04 주식회사 엘지화학 배관용 수지 조성물의 장기 내구성 예측 방법 및 배관용 수지에 사용되는 올레핀계 고분자
KR20190037945A (ko) * 2017-09-29 2019-04-08 주식회사 엘지화학 배관용 수지 조성물의 장기 내구성 예측 방법
KR102184390B1 (ko) 2017-09-29 2020-11-30 주식회사 엘지화학 배관용 수지 조성물의 장기 내구성 예측 방법
US11697699B2 (en) 2017-09-29 2023-07-11 Lg Chem, Ltd. Method for predicting long-term durability of resin composition for piping and olefinic polymer used for resin for piping

Also Published As

Publication number Publication date
EP0892979A1 (de) 1999-01-27
CN1097825C (zh) 2003-01-01
NO984715L (no) 1998-10-09
NO984715D0 (no) 1998-10-09
ES2200173T3 (es) 2004-03-01
BR9709117A (pt) 1999-08-03
DE69722197D1 (de) 2003-06-26
AR006572A1 (es) 1999-09-08
ATE241203T1 (de) 2003-06-15
AU2600797A (en) 1997-10-29
KR20000005334A (ko) 2000-01-25
CA2248654C (en) 2004-05-25
CN1215497A (zh) 1999-04-28
TW374934B (en) 1999-11-21
ID18484A (id) 1998-04-09
JP2000508466A (ja) 2000-07-04
DE69722197T2 (de) 2003-12-04
TR199802018T2 (xx) 1999-01-18
CA2248654A1 (en) 1997-10-16
WO1997038424A1 (en) 1997-10-16

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