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AssigneeBorealis AG
InventorsThomas Steffl, Christer Svanberg
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Described herein is a cable that includes a conductor surrounded by at least one semiconductive layer, wherein the layer comprises a polymer composition comprising a polypropylene homopolymer or a polypropylene copolymer with one or more comonomers, a polyolefin functionalized with an anhydride of a mono- or polycarboxylic acid, wherein said anhydride of a mono- or polycarboxylic acid can be linear or cyclic, wherein the functionalized polyolefin is different from the polypropylene homopolymer or polypropylene copolymer or the second polymer, and wherein the amount of the functionalized polyolefin is up to 10 wt % based on the total amount of the polymer composition, a solid conductive filler and a LDPE homopolymer or a LDPE copolymer of ethylene with one or more comonomers having a melting temperature (Tm) less than the Tm of the polypropylene homopolymer or polypropylene copolymer. Also described herein is a process for producing the polymer composition.
A cable comprising a conductor surrounded by at least one layer, wherein the layer comprises a polymer composition comprising
Dependencies are inferred from the claim text.
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Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors: conductive material dispersed in…
Homopolymers or copolymers of propene: copolymers of propene
Conductive material dispersed in non-conductive organic material: the conductive material comprising carbon-silicon compounds, carbon or silicon
Mainly consisting of inorganic substances: mica
About 6 years 4 months of term left · ends 23 Feb 2033 (estimated)
This application is a U.S. national phase application under 35 USC 371 of international application number PCT/EP2011/058937, filed May 31, 2011, which claims priority to European Application No. 10165492.9, filed Jun. 10, 2010, which is hereby incorporated herein by reference in its entirety for all purposes.
The present invention relates to a composition for a semiconductive layer suitable for cables. Moreover, the present invention is related to a process for producing said composition for a semiconductive layer as well as to the use of said composition. Further, the invention is also related to an article, preferably a cable, comprising said composition.
JP2002338780 discloses a way to improve the dispersibility of a carbon black in a conductive elastomer composition which is prepared by adding the carbon black as a conductive filler to a styrene-ethylene-butylene-styrene block copolymer (SEBS). By adding a carbon black and a maleic-anhydride-modified styrene-ethylene-butylene-styrene block copolymer to an SEBS, the dispersibility of the carbon black in the SEBS is improved.
The present invention thus provides a cable, comprising a conductor surrounded by at least one layer, wherein the layer comprises, preferably consists of, the polymer composition which comprises a) a polyolefin, b) a polyolefin functionalised with a mono- or polycarboxylic acid compound or a derivative of a mono- or polycarboxylic acid compound, wherein the functionalised polyolefin (b) is different from the polyolefin (a) or the optional second polymer (d), in case any of these is a polar copolymer, c) a solid conductive filler and, optionally, d) a second polymer which has a melting temperature (Tm) of less than the Tm of the polyolefin (a).
Accordingly, the (a) polyolefin, the (b) polyolefin functionalised with a mono- or polycarboxylic acid compound or a derivative of a mono- or polycarboxylic acid compound and the optional (d) second polymer which has a melting temperature (Tm) of less than the Tm of the polyolefin (a) present in the polymer composition of the inventive cable are different polymers, i.e. they differ from each other.
“Functionalised” means herein a chemical modification, preferably grafting or copolymerising with a mono- or polycarboxylic compound or a derivative of a mono- or polycarboxylic compound to provide the desired functional groups.