Borealis Ag

Borealis Technology Oy

Alfred Campus

Annika Smedberg

Ulf Nilsson

Claes Broman

Ola Fagrell

Roger Carlsson

Andreas Farkas

Peter Carstensen

Bjorn Voigt

Lena Lindbom

Anders Gustafsson

Achim Blok

Anders Ericsson

Jan-Ove Bostroem

Perry Nylander

Hans Eklind

Karl-Michael Jäger

Jan-Ove Bostrom

Jan-Ove Boström

Björn Voigt

Ulf Nillson

Wilfried Kalkner

Marc Brüggemann

Markus Huber

Hermann Schild

01 / Nilsson Ulf Nilsson

Karl-Michael Jaeger

Marc Brueggemann

A crosslinkable and crosslinked polymer composition containing a low density polyethylene (LDPE) homopolymer or low density polyethylene (LDPE) copolymer has excellent direct current (DC) electrical properties. The crosslinked polymer composition has an electrical conductivity of 150 fS/m or less, when measured at 70&#xb0; C. and a 30 kV/mm mean electric field from a non-degassed, 1 mm thick plaque sample of the crosslinked polymer composition when measured according to a direct current (DC) conductivity method. A cable can be surrounded by at least one layer of the polymer composition.

Polymer composition and a power cable comprising the polymer composition

An alternating current (AC) power cable includes a conductor surrounded by at least an inner semiconductive layer including a first semiconductive composition, an insulation layer including a polymer composition, an outer semiconductive layer including a second semiconductive composition, and optionally a jacketing layer including a jacketing composition, in that order. The polymer composition of the insulation layer includes an unsaturated low density polyethylene (LDPE) copolymer of ethylene with one or more polyunsaturated comonomers and a crosslinking agent. The polymer composition of the insulation layer has a dielectric loss expressed as tan &#x3b4; (50 Hz) of 12.0&#xd7;10or less, when measured at 25 kV/mm and 130&#xb0; C. according to 'Test for Tan &#x3b4; measurements on 10 kV cables'.

A method produces a polymer composition with improved DC electrical properties. A cable can be surrounded by at least one layer that includes the polymer composition. The polymer composition includes a polyolefin, and the polymer composition has an electric conductivity of 0.50&#xd7;10S/m or less, when measured according to DC conductivity method using a tape sample consisting of the polymer composition.

Polymer composition comprising a polyolefin produced in a high pressure process, a high pressure process and an article

A power cable includes a conductor surrounded by one or more layers. At least one of the layers can include a polymer composition having an electric conductivity of 0.50&#xd7;10S/m or less when measured according to DC conductivity method using a tape sample. The polymer composition can include a polyolefin which is obtainable by a high pressure polymerization process. This process includes: compressing one or more monomers under pressure in a compressor, in which a compressor lubricant, such as mineral oil is used for lubrication; polymerizing a monomer optionally together with one or more comonomers in a polymerization zone; and separating the obtained polyolefin from the unreacted products and recovering the separated polyolefin in a recovery zone.

The invention relates to a use of a polymer composition for producing an insulation layer of an AC power cable with and to an AC cable surrounded by at least an insulating layer comprising said polymer composition.

A crosslinkable and crosslinked polymer composition with improved DC electrical properties and a cable surrounded by at least one layer comprising the polymer composition are provided.

A cable comprising a semiconductive layer and an insulation layer with improved DC electrical properties is provided.

Cable and production process thereof

The invention relates to a method for producing a polymer using a chain transfer agents. In particular, the invention relates to a process for polymerizing a polymer in the presence of a mixture of at least two chain transfer agents, which mixture comprises

Process for producing a polymer and a polymer for wire and cable applications

The invention relates to a semiconductive polymer composition for use in power cables. The composition comprises a multimodal ethylene homo- or copolymer produced in a polymerization process comprising a single site catalyst whereby the polymer composition has a density of 870 to 930 kg/m3, a MFR2 of 1 to 30 g/10 min and a Mw/Mn of less than or equal to 10.

Semiconductive polymer composition

The present invention relates to a semiconductive polymer composition comprising an olefin homo- or copolymer wherein the composition has a direct current volume resistivity of less than 1000 Ohm&#xb7;cm at 90&#xb0; C., an elongation at break which after aging for 240 hours at 135&#xb0; C. does not change by more than 25%, and a total number of structures of 20 or less in the SIED test. Furthermore, the present invention relates to an electric power cable comprising a conductor, a semiconducting layer and, adjacent to the semiconducting layer, an insulation layer, wherein the semiconducting layer is formed by said semiconductive polymer composition and to the use of said semiconducting polymer composition for the production of a semiconductive layer of an electric power cable.

Semiconductive polymer compositions

A semiconductive polymer composition for use in power cables, wherein the composition has a multimodal ethylene homo- or copolymer produced in a polymerization process having a single site catalyst whereby the polymer composition has a density of 870-930 kg/m, a MFRof 1 to 30 g/10 min and a Mw/Mn of less than or equal to 10.

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Eysins, Switzerland

Alfred Campus