Patent · US Expired

Singlelayer and multilayer polyolefin foam pipes

US6986922B2 · kind B2 · utility

15Cited by

13References

14Claims

0Family size

Assignee

Borealis AG · AT

Inventors

Achim Hesse · Dresden, DE
Tony Lindstroem · Bleket, SE
Carl-Gustaf Ek · Mölndal, SE
Cecilia Rydin · Ayacucho, PE

Key dates

Filing date	Jul 10, 2001
Grant date	Jan 17, 2006
Priority date	—
Expiry date	Oct 15, 2021

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/249993
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

Single layer and multilayer polyolefin foam pipes with improved compression resistance have a polyolefin foam layer which consists of mixtures of modified propylene polymers having strain hardening behaviour or propylene homopolymers with a stereospecifity index >98% or propylene copolymers with a stereospecifity index of the homopolymer matrix of >96%. The polyolefin foam pipes are coated steel pipes for transporting crude oil or gas products or district heating applications, single layer pipes for insulation purposes and for non- or low-pressure applications and multilayer plastic pipes for the transportation of hot or cold fluids.

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