Borealis Technology Oy

Merja Poikela

Markus Gahleitner

Kauno Alastalo

Bo Malm

Magnus Palmlöf

Pirjo Jääskeläinen

Arild Follestad

Espen Ommundsen

Anders E Nymark

Karl-Michael Jäger

Mika Harkonen

John Haugen

Robert Nigel Hampton

Hans M&aring;rtensson

Pirjo Jaeaeskelaeinen

Nigel Hampton

Magnus Palmloef

Karl-Michael Jaeger

Insulation layer for cables comprising a heterophasic polymer composition having superior mechanical and electrical properties and being environmentally friendly. The heterophasic polymer composition comprises a polymer matrix and dispersed therein a propylene copolymer having a weight average particle size of less than 1 &#x3bc;m.

Cable with thermoplastic insulation

A process for the production of a propylene based polymer, the process comprising the following steps: (a) a first polymerization stage comprising homopolymerizing propylene or copolymerizing propylene and at least one alpha-olefin in the presence of an alpha-olefin polymerization catalyst whereby to produce a polypropylene component; (b) a second polymerization stage comprising copolymerizing ethylene and at least one alpha-olefin in the presence of an alpha-olefin polymerization catalyst whereby to produce an ethylene/alpha-olefin copolymer component; and (c) blending the polymer components produced in steps (a) and (b) whereby to produce a polymer blend, wherein the first and second polymerization stages are effected in separate polymerization reactors connected in parallel. Also provided are polymer compositions comprising: (i) 30 to 97% by weight, based on the total weight of the polymer composition, of a propylene based polymer; and (ii) 3 to 70% by weight, preferably 5 to 20% by weight, based on the total weight of the polymer composition, of an ethylene copolymer plastomer (e.g., an ethylene-propylene plastomer) containing at least 60% by weight ethylene.

Process for producing propylene based polymer compositions

An insulating composition for an electric power cable, and an electric power cable comprising a conductor surrounded by an inner semiconducting layer, an insulating layer, and an outer semiconducting layer, where the insulating layer consists of said insulating composition, are disclosed. The insulating composition comprises a crosslinkable multimodal ethylene copolymer obtained by coordinating catalysed polymerization of ethylene and at least one alpha-olefin, and has a density of 0.890-0.940 g/cm and an MFR of 0.1-10 g/10 min. The insulating composition is characterized in that the ethylene copolymer has an MWD of 3-12, a melting temperature of at most 125&deg; C., and a viscosity of 2500-7000 Pa.s at 135&deg; C. and a shear rate of 10 s , 1000-1800 Pa.s at 135&deg; C. and a shear rate of 100 s , and 250-400 Pa.s at 135&deg; C. and a shear rate of 1000 s , and that the multimodal ethylene copolymer includes an ethylene copolymer fraction selected from (a) a low molecular weight ethylene copolymer having a density of 0.900-0.950 g/cm and an MFR of 25-300 g/10 min and (b) a high molecular weight ethylene copolymer having a density of 0.870-0.940 g/cm and an MFR of 0.01-3 g/10 min.

Insulating composition for an electric power cable

Growing community of inventors

Espoo, Finland

Merja Poikela