# US 2014/0190723 A1 · Power cable comprising polypropylene

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- Number: US 2014/0190723 A1
- Document ID: US20140190723A1
- Status: Published application
- Kind: A1
- Application number: 14/240,552
- Filed: 2012-08-29
- Published: 2014-07-10
- Earliest claimed: 2011-08-30
- Assignees: Borealis AG
- Inventors: Torvald Vestberg; Peter Denifl; Per-Ola Hagstrand; Villgot Englund; Ulf Nilsson; Anders Nymark
- Web page: https://patentgrep.com/patent/US20140190723A1

## CPC

- H01B 3/303: {Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups H01B3/38 or H01B3/302}
- C08L 23/10: Homopolymers or copolymers of propene
- H01B 3/441: {from alkenes}
- H01B 9/00: Power cables
- C08F 10/06: Propene
- C08F 110/06: Propene
- C08F 210/06: Propene
- C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond}
- C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers
- C08L 2314/02: Ziegler natta catalyst
- C08L 2314/06: Metallocene or single site catalysts
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS

## 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.

## Claims

### Claim 1

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).

### Claim 2

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.

### Claim 3

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).

### Claim 4 (depends on 1)

Power cable according to claim 1, wherein said catalyst fragments (F) originate from a solid catalyst system (SCS),
(a) said solid catalyst system (SCS) has
(a1) a pore volume measured according ASTM 4641 of less than 1.40 ml/g,
and/or
(a2) a surface area measured according to ASTM D 3663 of lower than 30 m2/g,
and/or
(a3) a mean particle size d50 in the range of 1 to 200 μm,
and/or
(b) said solid catalyst system (SCS) is obtained by
(b1) 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),
(b2) forming a liquid/liquid emulsion system (E), which comprises said solution (S) as droplets dispersed in the continuous phase of the emulsion system (E),
(b3) solidifying said dispersed phase (droplets) to form the solid catalyst system (SCS).

### Claim 5 (depends on 2)

Power cable according to claim 2, wherein the 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).

### Claim 6 (depends on 3)

Power cable according to claim 3, wherein said solid catalyst system (SCS)
(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.

### Claim 7 (depends on 2)

Power cable according to claim 2, wherein the polypropylene (PP) comprises nanosized catalyst fragments (F) originating from the solid catalyst system (SCS).

### Claim 8 (depends on 7)

Power cable according to claim 7, wherein the nanosized catalyst fragments (F) have a mean particle size d50 of below 1 μm.

### Claim 9 (depends on 2)

Power cable according to claim 2, wherein said solid catalyst system (SCS) comprises inclusions (IC), said inclusions (IC) are catalytically inactive solid material having
(a) a specific surface area below 500 m2/g,
and/or
(b) a mean particle size below 200 nm.

### Claim 10 (depends on 2)

Power cable according to claim 2, wherein the active catalyst species of the solid catalyst system (SCS) is a Ziegler-Natta catalyst or a single-site catalyst.

### Claim 11 (depends on 1)

Power cable according to claim 1, wherein the polypropylene (PP) is not crosslinked.

### Claim 12 (depends on 1)

Power cable according to claim 1, wherein the polypropylene (PP) is
(a) a propylene homopolymer (H-PP),
or
(b) a random propylene copolymer (R-PP),
or
(c) a heterophasic propylene copolymer (HECO) comprising
(c1) a polymer matrix (M) being said propylene homopolymer (H-PP) and/or said random propylene copolymer (R-PP),
and
(c2) an elastomeric propylene copolymer (E).

### Claim 13 (depends on 1)

Power cable according to claim 1, wherein the polypropylene (PP) is a random propylene copolymer (R-PP) and said random propylene copolymer (R-PP) is produced in the presence of a solid catalyst system (SCS), wherein further the active catalyst species of said solid catalyst system (SCS) is a Ziegler-Natta catalyst or a single-site catalyst.

### Claim 14 (depends on 1)

Power cable according to claim 1, wherein the polypropylene (PP) is a heterophasic propylene copolymer (HECO) and said heterophasic propylene copolymer (HECO) is produced in the presence of a solid catalyst system (SCS), wherein further the active catalyst species of said solid catalyst system (SCS) is a Ziegler-Natta catalyst or a single-site catalyst.

### Claim 15 (depends on 1)

Power cable according to claim 1, wherein the power cable comprises a conductor surrounded by an inner semiconductive layer, an insulating layer and an outer semiconductive layer, in that order, wherein at least the insulation layer is layer (L).

### Claim 16 (depends on 1)

Power cable according to claim 1, wherein the power cable is a high voltage direct current (HVDC) power cable.

### Claim 17

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.

### Claim 18 (depends on 10)

Power cable according to claim 10, wherein the active catalyst species of said solid catalyst system (SCS) is a single-site catalyst.

### Claim 19 (depends on 13)

Power cable according to claim 13, wherein the active catalyst species of said solid catalyst system (SCS) is a single-site catalyst.

### Claim 20 (depends on 14)

Power cable according to claim 14, wherein the active catalyst species of said solid catalyst system (SCS) is a single-site catalyst.