Power cable comprising polypropylene
AssigneeBorealis AG
InventorsTorvald Vestberg, Peter Denifl, Per-Ola Hagstrand, Villgot Englund, Ulf Nilsson, Anders Nymark
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Abstract
Power cable comprising a conductor surrounded by at least one layer comprising a polypropylene, wherein the polypropylene comprises nanosized catalyst fragments being evenly distributed in said polypropylene.
Claims20
Power cable comprising a conductor surrounded by at least one layer (L) comprising a polypropylene (PP), wherein the polypropylene (PP) comprises nanosized catalyst fragments (F) which originate from a solid catalyst system (SCS).
Power cable comprising a conductor surrounded by at least one layer comprising a polypropylene (PP), wherein the polypropylene (PP) has been produced in the presence of a solid catalyst system (SCS), said solid catalyst system (SCS) has
- (a) a pore volume measured according ASTM 4641 of less than 1.40 ml/g,
- and/or
- (b) a surface area measured according to ASTM D 3663 of lower than 30 m2/g,
- and/or
- (c) a mean particle size d50 in the range of 1 to 200 μm.
Power cable comprising a conductor surrounded by at least one layer comprising a polypropylene (PP), wherein the polypropylene (PP) has been produced in the presence of a solid catalyst system (SCS), said solid catalyst system (SCS) is obtained by
- (a) providing a solution (S) comprising an organometallic compound of a transition metal of one of the groups 3 to 10 of the periodic table (IUPAC),
- (b) forming a liquid/liquid emulsion system (E), which comprises said solution (S) as droplets dispersed in the continuous phase of the emulsion system (E),
- (c) solidifying said dispersed phase (droplets) to form the solid catalyst system (SCS).
A process for producing a power cable according to one of the preceding claims, wherein the process comprises the steps of
- (a) producing the polypropylene (PP) in the presence of the solid catalyst system (SCS), and
- (b) applying on the conductor, preferably by (co)extrusion, at least one layer (L) which comprises, preferably consists of, the polypropylene (PP),
- wherein the polypropylene (PP) and the solid catalyst system (SCS) are defined according to one of the preceding claims.
Dependencies are inferred from the claim text.