Patent · US Active

Polyethylene molding composition for coating steel pipes

US7872071B2 · kind B2 · utility

4Cited by

17References

8Claims

0Family size

Assignee

Basell Polyolefine GmbH · DE

Inventors

Joachim Berthold · Prien am Chiemsee, DE
Ludwig Bohm · Mainz, DE
Heinz Vogt · Ludwigshafen, DE

Key dates

Filing date	Nov 17, 2005
Grant date	Jan 18, 2011
Priority date	—
Expiry date	Sep 14, 2027

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L2314/02
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a polyethylene molding composition which has a multimodal molar mass distribution and is particularly suitable for producing protective coatings on steel pipes. The molding composition has a density at a temperature of 23° C. in the range from 0.94 to 0.95 g/cm3 and an MFI190/5 in the range from 1.2 to 2.1 dg/min. It comprises from 45 to 55% by weight of a low molecular weight ethylene homopolymer A, from 30 to 40% by weight of a high molecular weight copolymer B of ethylene and another olefin having from 4 to 8 carbon atoms and from 10 to 20% by weight of an ultra high molecular weight ethylene copolymer C.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.