Stock material or miscellaneous articles – Hollow or container type article – Shrinkable or shrunk
Patent
1989-11-13
1991-07-09
Seidleck, James J.
Stock material or miscellaneous articles
Hollow or container type article
Shrinkable or shrunk
174DIG8, 285381, 428 351, 428327, F16L 2500
Patent
active
050304879
ABSTRACT:
A method of joining, repairing or reinforcing substrates, particularly polymeric pipes for transporting fluids, e.g. natural gas and water. The method makes use of an article, preferably a heat-recoverable article, which comprises a conductive polymer composition and which is heated to its recovery temperature by passing electrical current through the conductive polymer. Preferably the article is a heat-shrinkable coupler. The coupler may make direct contact with and fuse to the pipes, or there may be an insert between the coupler and the pipes. The article preferably comprises carbon blank dispersed in either a sintered polymer, particularly ultra high molecular weight polyethylene or a very high molecular weight polymer, particularly polyethylene having a molecular weight greater than 150,000.
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Burkard Herbert G.
Gerstner Marguerite E.
Raychem Corporation
Richardson Timothy H. P.
Seidleck James J.
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