The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 07, 2014
Filed:
Dec. 09, 2008
Martin Anker, Hisings Karra, SE;
Siw Bodil Fredriksen, Skien, NO;
Pal Christian Bentzrod, Stavern, NO;
Mats Backman, Gooteborg, SE;
Leif Leiden, Andersbole, FI;
Markku Vahteri, Porvoo, FI;
Petri Rekonen, Porvoo, FI;
Martin Anker, Hisings Karra, SE;
Siw Bodil Fredriksen, Skien, NO;
Pal Christian Bentzrod, Stavern, NO;
Mats Backman, Gooteborg, SE;
Leif Leiden, Andersbole, FI;
Markku Vahteri, Porvoo, FI;
Petri Rekonen, Porvoo, FI;
Borealis Technology Oy, Porvoo, FI;
Abstract
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.