Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1985-04-02
1988-10-04
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
156 49, 156 86, 219535, 264 36, 264105, 264154, 264230, 264249, B29C 6102
Patent
active
047755016
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 black 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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Rosenzweig Nachum
Soni Pravin L.
Raychem Corp.
Richardson Timothy H. P.
Thurlow Jeffery
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