WO1995009198A1 - An extrudable conducting polymer compound - Google Patents
An extrudable conducting polymer compound Download PDFInfo
- Publication number
- WO1995009198A1 WO1995009198A1 PCT/SE1994/000871 SE9400871W WO9509198A1 WO 1995009198 A1 WO1995009198 A1 WO 1995009198A1 SE 9400871 W SE9400871 W SE 9400871W WO 9509198 A1 WO9509198 A1 WO 9509198A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- weight
- polymer composition
- per cent
- insulation
- polyolefin
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/08—Copolymers of ethene
- C08L23/0846—Copolymers of ethene with unsaturated hydrocarbons containing other atoms than carbon or hydrogen atoms
- C08L23/0853—Vinylacetate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/06—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
Definitions
- the invention relates to an extrudable conducting polymer composition and the use thereof as external conducting layer in an insulating system for electric cables.
- the invention relates to a conducting crosslinkable polymer composition which by means of extrusion is intended to be applied as a casing around an insulated electric conductor, where the insulating layer is a polymeric material in thermoplastic or cross-linked form.
- the conductor is arranged with an insulation of a thermoplastic or crosslinkable polymer, for example a polyethylene, it is often necessary to provide the insulation with an inner and an outer conducting layer to control the electric field strength.
- the conducting layers usually consist of extrudable electrically conducting polymer composition.
- an inner conducting layer Around the inner metallic conductor there is applied an inner conducting layer, the task of which is to equalize the elec ⁇ tric field between the conductor and the insulation.
- a second conducting layer is applied across the insulation.
- This outer conducting layer shall have sufficiently good pro ⁇ perties to function as an electric screen, and further this outer conducting layer must be easily removable from the inner insulation during joining and mounting work. In this way it is required that the outer conducting layer, on the one hand, shall have a sufficient adhesion to the insulation to ensure that the necessary electric screening is obtained and that no corona arises between the outer conducting layer and the insulation whereas, on the other hand, the adhesion must not prevent a rapid and simple stripping during mounting.
- the outer conducting layer is applied by extrusion around the insulation.
- the conducting polymer composition preferably consists of mixtures comprising a copolymer of ethylene and a second polar monomer such as vinyl acetate, ethylacrylate, butylacrylate, methylacrylate, etc., and a polyolefin, pre ⁇ ferably a crystalline polypropylene.
- the mixture may also contain an elastomer such as a copolymer or terpolymer of ethylene propylene.
- This polymer composition also comprises an electrically conducting filler such as carbon black to impart to the polymer compound the necessary electrical conductivity and also a stabilization system comprising, inter alia, antioxidants to counteract degradation as a result of external influence such as oxidation, radiation and electric load. Where there is a need to crosslink the polymer composition, additives of any agents necessary for crosslinking of the polymer composition may also be included.
- an electrically conducting filler such as carbon black to impart to the polymer compound the necessary electrical conductivity
- a stabilization system comprising, inter alia, antioxidants to counteract degradation as a result of external influence such as oxidation, radiation and electric load.
- additives of any agents necessary for crosslinking of the polymer composition may also be included.
- the strippability of the composition layer depends on its adhesion to the underlying insulating material in combination with its mechanical properties.
- the strippability of the outer conducting layer is, however, for known conducting polymer compositions deteriorated with increasing temperature and even at temperatures around 30°C problems arise as a consequence of the physical properties of the polymer composition changing with the temperature.
- an electrically conducting polymer composition intended for use in a cable insulation as external strippable layer around an insulation of a thermoplastic or crosslinkable polymer composition for example polyethylene, it is known to use the following compositions:
- EVA ethylene vinyl acetate copolymer
- EPM ethylene propylene copolymer
- EPDM terpolymer of ethylene propylene
- an electrically conducting filler such as carbon black
- stabilizing additives which at least comprise one antioxidant
- the adhesion to the insulating material is not higher than that the conducting layer can be easily removed, be stripped, from the polymeric insulating material within a wide temperature interval corresponding to a majority of con- curvable conditions during use and mounting, preferably within a temperature interval of -20°C to +65°C.
- An extrudable electrically conducting polymer composition in the form of a mixture comprising at least:
- a copolymer consisting of 20 to 80 per cent of ethylene and of 80 to 20 per cent by weight of a polar monomer, such as vinyl acetate, ethylacrylate, methylacrylate or butylacrylate,
- stabilizing additives such as antioxidants
- the modified polypropylene used according to the invention is a graft copolymer of a crystalline polypropylene and a carbo- xylic acid anhydride, or a block copolymer of a crystalline polypropylene and a co- or terpolymer of ethylene propylene.
- the above-mentioned polymer composition is crosslinkable by means of silane technique.
- the polymer composition according to this embodiment has been reacted with a silane containing hydrolyzable groups, whereby the polymer composition can be crosslinked by bringing the formed product into contact with moisture or water such that hydrolyzable groups in the silane compound are hydrolyzed and, by condensation, give rise to siloxane bonds between the grafted molecules in the polymer composition.
- Silane grafting is described in greater detail in the following patent speci ⁇ fications: US 3 075 948 and US 3 646 155.
- an extrudable electrically conducting polymer composition which, in relation to known polymer compositions, for the described application, as an outer conducting layer in an insulating system for electric cables, exhibits a greater thermal stability of the mechanical properties.
- an outer conducting layer of a polymer composition according to the invention which by extrusion has been applied to a polyethylene insulation included in an electric cable, exhibits good strippability within a great temperature inter ⁇ val, preferably between -20°C and +65°C.
- the conducting layer can be easily stripped from an insulating layer since the adhesion of a polymer composition layer, according to the invention, to a polyethylene insulation is not higher than what is required to ensure that corona does not occur between the layer and the insulation.
- the extrudable electri ⁇ cally conducting polymer composition comprises, in addition to carbon black, any fillers and the necessary stabilization system, at least one copolymer of ethylene and vinyl acetate, EVA, mixed with polypropylene, PP, where according to the invention the polypropylene has been modified by polar groups and where the content of vinyl acetate in the ethylene vinyl acetate copolymer has been reduced, thus obtaining a polymer composition which, within the temperature interval described above, exhibits a stable adhesion to the polyethylene insu- lation.
- the mixing process is simplified since during the mixing of a polymer composition according to the invention only components which are compatible with each other are supplied to the mixer, and, in addition, the modification of the polyolefin improves its wetting ability towards carbon black.
- An extrudable electrically conducting polymer composition A XG 9607:70 from Neste Polymer Compounds AB.
- the material is a thermoplastic composition which is used as strippable outer layer for medium voltage cables with silane crosslinked polyethylene insulation.
- test bars were produced for tensile testing at room temperature, RT, and 50°C in a tensile testing machine.
- the polymer composition was extruded as an outer casing over a cable insulation of silane- crosslinked polyethylene.
- the strippability was determined in a tensile testing machine at a tensile angle of 180°, a ten ⁇ sile speed of 100 mm/min. and the following temperatures: -10°C, RT, +40°C, +45°C, +50°C and +60°C.
- Table 1 The results from tensile testing and strippability testing are shown in table 1.
- An extrudable electrically conducting polymer composition B was prepared by compounding the following components in a double-screw extruder into a homogeneous compound: 100 parts by weight of an ethylene vinyl acetate copolymer,
- EVA containing 72 per cent by weight ethylene and 28 per cent by weight vinyl acetate, 42 parts by weight polypropylene, PP,
- EPDM 62 parts by weight carbon black of conducting type, and 5.6 parts by weight of a stabilization system comprising at least one antioxidant.
- test bars were manufactured for tensile testing at room temperature, RT, and 50°C in a tensile testing machine.
- the polymer composition was extruded as an outer casing over the cable insulation of silane-crosslinked polyethylene. The results are shown in Table 1.
- An extrudable electrically conducting polymer composition C with a composition according to the invention was prepared by compounding the following components in a double-screw extruder into a homogeneous compound:
- EVA containing 72 per cent by weight ethylene and 28 per cent by weight vinyl acetate, 40 parts by weight modified polypropylene, PP carboxylic acid anhydride, 46 parts by weight carbon black of conducting type, and 5.6 parts by weight of a stabilization system comprising a least one antioxidant.
- test bars were manufactured for tensile testing at room temperature, RT, and 50°C in a tensile testing machine.
- the polymer composition was extruded as an outer casing over a cable insulation of silane-crosslinked polyethylene.
- the strippa ⁇ bility was determined in a tensile testing machine at a ten ⁇ sile angle of 180°, a tensile speed of 100 mm/min and the following temperatures: -10°C, RT, +40°C, +45°C, +50°C and +60°C. The results are shown in Table 1.
- An extrudable electrically conducting polymer composition D with a composition according to the invention was prepared by compounding the following components in a double-screw extruder into a homogeneous compound:
- EVA containing 72 per cent by weight ethylene and 28 per cent by weight vinyl acetate, 70 parts by weight modified polypropylene in the form of a copolymer of polypropylene and EPDM,
- test bars were manufactured for tensile testing at room temperature, RT, and 50°C in a tensile testing machine.
- the polymer composition was extruded as an outer casing over a cable insulation of silane-crosslinked polyethylene.
- the strippa- bility was determined in a tensile testing machine at a ten ⁇ sile angle of 180°, a tensile speed of 100 mm/min and the following temperatures: -10°C, RT, +40°C, +45°C, +50°C and +60°C. The results are shown in Table 1. Table 1
- composition A B Composition A B
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Dispersion Chemistry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Conductive Materials (AREA)
- Organic Insulating Materials (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU78258/94A AU7825894A (en) | 1993-09-28 | 1994-09-20 | An extrudable conducting polymer compound |
EP94929069A EP0739380A1 (en) | 1993-09-28 | 1994-09-20 | An extrudable conducting polymer compound |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9303153-2 | 1993-09-28 | ||
SE9303153A SE9303153L (en) | 1993-09-28 | 1993-09-28 | An extrudable conductive polymer composition |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995009198A1 true WO1995009198A1 (en) | 1995-04-06 |
Family
ID=20391234
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1994/000871 WO1995009198A1 (en) | 1993-09-28 | 1994-09-20 | An extrudable conducting polymer compound |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0739380A1 (en) |
AU (1) | AU7825894A (en) |
SE (1) | SE9303153L (en) |
WO (1) | WO1995009198A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1382641A1 (en) * | 2002-07-19 | 2004-01-21 | Acome Société Cooperative De Production, Société Anonyme, A Capital Variable | Optical cable comprising a particular sheath |
US10763004B2 (en) | 2014-03-12 | 2020-09-01 | 3M Innovative Properties Company | Conductive polymeric material |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1988006341A1 (en) * | 1987-02-20 | 1988-08-25 | Aktieselskabet Nordiske Kabel- Og Traadfabriker | Method of producing an electrically semi-conducting, strippable plastics mixture |
EP0311723A1 (en) * | 1987-10-14 | 1989-04-19 | Elf Atochem S.A. | Filler-containing polypropylene resin composition and process for producing the same |
EP0520752A1 (en) * | 1991-06-24 | 1992-12-30 | Borealis Holding A/S | Stabilised polymer composition and use |
-
1993
- 1993-09-28 SE SE9303153A patent/SE9303153L/en not_active IP Right Cessation
-
1994
- 1994-09-20 AU AU78258/94A patent/AU7825894A/en not_active Abandoned
- 1994-09-20 WO PCT/SE1994/000871 patent/WO1995009198A1/en not_active Application Discontinuation
- 1994-09-20 EP EP94929069A patent/EP0739380A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1988006341A1 (en) * | 1987-02-20 | 1988-08-25 | Aktieselskabet Nordiske Kabel- Og Traadfabriker | Method of producing an electrically semi-conducting, strippable plastics mixture |
EP0311723A1 (en) * | 1987-10-14 | 1989-04-19 | Elf Atochem S.A. | Filler-containing polypropylene resin composition and process for producing the same |
EP0520752A1 (en) * | 1991-06-24 | 1992-12-30 | Borealis Holding A/S | Stabilised polymer composition and use |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1382641A1 (en) * | 2002-07-19 | 2004-01-21 | Acome Société Cooperative De Production, Société Anonyme, A Capital Variable | Optical cable comprising a particular sheath |
FR2842611A1 (en) * | 2002-07-19 | 2004-01-23 | Acome Soc Coop Travailleurs | OPTICAL UNIT COMPRISING A PARTICULAR SLEEVE |
US10763004B2 (en) | 2014-03-12 | 2020-09-01 | 3M Innovative Properties Company | Conductive polymeric material |
Also Published As
Publication number | Publication date |
---|---|
SE501562C2 (en) | 1995-03-13 |
AU7825894A (en) | 1995-04-18 |
SE9303153D0 (en) | 1993-09-28 |
EP0739380A1 (en) | 1996-10-30 |
SE9303153L (en) | 1995-03-13 |
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