ENERGY CABLE HAVING A VOLTAGE STABILIZED THERMOPLASTIC ELECTRICALLY INSULATING LAYER
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United States of America Patent
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Issued Date -
Sep 12, 2013
app pub date -
Nov 25, 2010
filing date -
Nov 25, 2010
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Abstract
A cable includes at least one electrical conductor and at least one electrically insulating layer surrounding the electrical conductor, wherein the at least one electrically insulating layer includes: (a) a thermoplastic polymer material selected from: at least one copolymer (i) of propylene with at least one olefin comonomer selected from ethylene and an α-olefin other than propylene, the copolymer having a melting point greater than or equal to 130° C. and a melting enthalpy of from 20 J/g to 90 J/g; a blend of at least one copolymer (i) with at least one copolymer (ii) of ethylene with at least one α-olefin, the copolymer (ii) having a melting enthalpy of from 0 J/g to 70 J/g; a blend of at least one propylene homopolymer with at least one copolymer (i) or copolymer (ii); at least one of copolymer (i) and copolymer (ii) being a heterophasic copolymer; (b) at least one dielectric fluid intimately admixed with the thermoplastic polymer material, the at least one dielectric fluid being an aromatic dielectric fluid having a ratio of number of aromatic carbon atoms to total number of carbon atoms greater than or equal to 0.3; and (c) at least one voltage stabilizer selected from substituted benzophenones and hindered amines.
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