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:
Feb. 13, 2001
Filed:
Sep. 03, 1998
Borealis A/S, Lyngby, DK;
Abstract
A multilayer pipe having improved resistance to rapid crack propagation is described.; The pipe consists of at least two layers of different propylene plastic materials, which are so selected and combined that the pipe has a resistance to rapid crack propagation, measured as the critical temperature, which is equal to or lower than 0° C. The pipe is made of polypropylene plastic, and at least one of the layers of the pipe comprises a polypropylene plastic, which is selected from a propylene contanig from 1.0 to 10.0% by weight of ethylene or C,-C,-&agr;-olefin repeating units and having an MFR,value of between 0.05 and 0.40 g/10 min or an elastromer-modified polypropylene containing from 1.0 to 30% by weight of ethylene or C,-C,-&agr; olefin repeating units and having an MFR,value of between 0.05 and 50 g/10 min.