F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
400/7005, 18/978
F16L 47/00 (2006.01) B29C 61/00 (2006.01) B29C 61/06 (2006.01) B29C 65/68 (2006.01) F16L 47/22 (2006.01) F16L 55/17 (2006.01)
Patent
CA 1273446
MP0922 ABSTRACT A method of joining, repairing, reinforcing or otherwise modifying substrates, particularly polymeric pipes for transporting fluids, e.g. natural gas and water. The method makes use of an article, e.g. a heat-recoverable article, which comprises a conductive polymer composition and which is heated by passing electrical current through the conductive polymer. The article may make direct contact with and fuse to the substrate or there may be an insert between the article and the substrate. The conductive polymer has a Melt Flow Index of less than 0.3 g/10 min at a temperature 50°C above its softening point and at a loading of 5 kg and a Melt Flow Index of less than 3.0 g/10 min at a temperature 50°C above its softening point and at a loading of 15 kg. The conductive polymer preferably comprises carbon black dispersed either in a sintered polymer, particularly ultra high molecular weight polyethylene, or in a very high molecular weight polymer, particularly polyethylene having a molecular weight greater than 150,000.
478186
Rosenzweig Nachum
Soni Pravin
Central Plastics Company
Marks & Clerk
Raychem Corporation
Rosenzweig Nachum
Soni Pravin
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