Process for coating a pipe with high throughput using multimodal ethylene copolymer, and coated pipes obtained thereof

US8361578B2 · kind B2 · utility

Assignee

• Borealis Technology Oy · FI

Inventors

• Mats Bäckman · Gothenburg, SE
• Martin Anker · Karlskrona, SE
• Siw Bodil Fredriksen · Skien, NO
• Leif Leiden · Hammarland, FI
• Markku Vahteri · Porvoo, FI
• Petri Rekonen · Helsinki, FI

Key dates

• Filing date: Dec 8, 2008
• Grant date: Jan 29, 2013
• Expiry date: Feb 16, 2029

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/1393
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Coated pipes have 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 MFR2 of from 0.05 g/10 min to 5 g/10 min, a melt index MFR5 of from 0.5 to 10 g/10 min and a density of from 930 kg/m3 to 955 kg/m3.