Borealis Technology Oy

Evonik Oxeno Gmbh

Pal Christian Bentzrod

Martin Anker

Markku Vahteri

Siw Bodil Fredriksen

Leif Leiden

Petri Rekonen

Michael Grass

Mats Bäckman

Jarmo Lindroos

Stefan Buchholz

Tore Dreng

Ted M Pettijohn

Gerhard Ellermann

Mats Baeckman

The present invention deals with coated pipes having a layer of multimodal polyethylene. The multimodal ethylene copolymer is a copolymer of ethylene with one or more alpha-olefin comonomers having from 4 to 10 carbon atoms and has a weight average molecular weight of from 70000 g/mol to 250000 g/mol, the ratio of the weight average molecular weight to the number average molecular weight, Mw/Mn, of from 15 to 50, a melt index MFRof from 0.05 g/10 min to 5 g/10 min, a melt index MFRof from 0.5 to 10 g/10 min and a density of from 930 kg/m to 955 kg/m. Further, the multimodal ethylene copolymer comprises the multimodal ethylene copolymer comprises from 49 to 59% based on the weight of the multimodal ethylene copolymer a low molecular weight ethylene homopolymer component, said low molecular weight ethylene homopolymer having a weight average molecular weight of from 5000 g/mol to 70000 g/mol; and from 51 to 41% based on the weight of the multimodal ethylene copolymer a high molecular weight ethylene copolymer component, said high molecular weight ethylene copolymer having a weight average molecular weight of from 100000 g/mol to 700000 g/mol. The pipes can be coated with high throughput and good production economy. The coatings have good mechanical properties.

Coated pipe with high throughput using multimodal ethylene copolymer

An alkene interpolymer is prepared by polymerizing at least one 3-substituted Calkene and at least one Calkene in a gas phase polymerization using a polymerization catalyst system.

Polyolefin gas phase polymerization with 3-substituted C4-10-alkene

The present invention deals with coated pipes having a layer of multimodal polyethylene. The multimodal ethylene copolymer is a copolymer of ethylene with one or more alpha-olefin comonomers having from 4 to 10 carbon atoms and has a weight average molecular weight of from 70000 g/mol to 250000 g/mol and a melt index MFRof from 0.05 g/10 min to 5 g/10 min, a melt index MFRof from 0.5 to 10 g/10 min and a density of from 945 kg/mto 958 kg/m. The coatings have a high stiffness, good properties at elevated temperatures and acceptable stress-cracking properties.

Coated pipes having improved mechanical properties at elevated temperatures and a method of production thereof

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Stavern, Norway

Pal Christian Bentzrod