Borealis Ag

Borealis Technology Oy

Koenraad Noyens

Christer Svanberg

Takashi Uematsu

Karl-Michael Jäger

Fredrik Skogman

Peter Walter

Marc De Vleesschauer

Malin Johansson

The invention provides a novel semiconductive polymer composition with improved smoothness and dispersibility of carbon black when compounding the polymer composition and feasible balance with other properties such as volume resistivity. The semiconductive polymer composition comprises (a) from 30 to 90 wt % of a polymer component, (b) from 10 to 70 wt % of carbon black and the carbon black (b) has a mass pellet strength (MPS) according to ASTM D1937-13 of from 50 to 250 N. The invention further relates to a process for preparing the semiconductive polymer composition comprising the steps of: i) introducing 30-90 wt % of a polymer component as defined above and 0-8 wt % additives in a mixer device and mixing the polymer component and additives at elevated temperature such that a polymer melt is obtained; ii) adding 10-70 wt % of a carbon black as defined above to the polymer melt and further mixing of the polymer melt.

Semiconductive polymer composition for electric power cables

The present invention provides a semiconductive polymer composition having (a) from 30 to 90 wt % of a polymer component, (b) from 10 to 60 wt % of carbon black and (c) from 0 to 8 wt % additives, based on the total semiconductive polymer composition, and wherein the composition comprises less than 23 particles per mhaving a width of larger than 150 &#x3bc;m at the half height of a particle protruding from the surface of the tape sample, less than 10 particles per mhaving a width of larger than 200 &#x3bc;m at the half height of a particle protruding from the surface of the tape sample, and preferably, about 0 particles per mhaving a width of larger than 500 &#x3bc;m at the half height of a particle protruding from the surface of the tape sample.

Semiconductive polymer composition

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Geel, Belgium

Koenraad Noyens