POLYOLEFIN COMPOSITION FOR MEDIUM/HIGH/EXTRA HIGH VOLTAGE CABLES WITH IMPROVED ELECTRICAL BREAKDOWN STRENGTH

摘要

The present invention relates to a polyolefm composition comprising: (i) a polyolefm (A); (ii) an aromatic compound (B) comprising a, preferably consisting of the, structural unit according to the following formula (I) wherein one or more of the C-atoms in the phenyl rings to which residue R1, R2, R3, R4, R5, R6, R7, or R8 is attached may also be a heteroatom, such as N, in which case the respective residue R1, R2, R3, R4, R5, R6, R7, or R8 is not present; X either is no atom so that there is a direct bond between the two phenyl rings, or is -C(R11)-, -C(R11)2-, -C(=Z)-, =N- or -N(R12)-, Y either is no atom so that there is a direct bond between the two phenyl rings, or is =C(R13)-, -C(R13)2-, -C(=Z)-, =N- or -N(R14)-, Z is a divalent atom such as O, R1, R2, R3, R4, R5, R6, R7, R8 and, if present, R11, R12, R13 and R14 independently are hydrogen, or a hydrocarbyl group which may contain heteroatoms; or at least two of said R1, R2, R3, R4, R5, R6, R7, R8 or, if present, R11, R12, R13 or R14, together with the ring atoms of the ring system of formula (I) they are attached to, form a further aromatic or non-aromatic ring fused to the ring system of formula (I), and wherein the ring system of formula (I) with said at least one fused further ring may further bear one to eight substituents, R1' to R8' each of which are independently selected from said same groups as R1 to R8; with the provisios that (i) at least one of said R1, R2, R3, R4, R5, R6, R7 or R8, or if present, at least one of said R1' to R8', is a hydrocarbyl which may contain hetero atoms; and (ii) at least one of said R1, R2, R3, R4, R5, R6, R7 or R8, or, if present, said R1' to R8', R11, R12, R13 or R14, is a hydrocarbyl which may contain heteroatoms and which has at least 6 non-H atoms; (iii) if any of said R1, R2, R3, R4, R5, R6, R7 or R8, and, if present, any of said R1' to R8', R11, R12, R13 or R14 is a hydrocarbyl group which may contain hetero atoms, is attached to an aromatic ring of the compound according to formula (I), said hydrocarbyl must be free of H-atoms in the alpha-position of the hydrocarbyl; and/or an aromatic compound with a. preferably consisting of the, structural unit according to the following formula (II) wherein one or more of the C-atoms in the naphtyi rings to which residue R1 R2, R3, R4, R5, R6, R7, or R8 is attached may also be a trivalent heteroatom such as N, in which case the respective residue R1, R2, R3, R4, R5, R6, R7, or R8 is not present; or at least two of said R1, R2, R3, R4, R5, R6, R7 or R8, together with the ring atoms of the ring system of formula (II) they are attached to, form a further aromatic or non-aromatic ring fused to the ring system of formula (II), and wherein the ring system of formula (II) with said at least one fused further ring may further bear one to eight substituents R1' to R8'; and R1, R2, R3, R4, R5, R6, R7 and R8, and, if present, said R1' to R8', have the same meaning and fulfil the same provisios as indicated for formula (I).