B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 1/08 (2006.01) F16L 9/12 (2006.01)
Patent
CA 2559820
A multi-layered pipe of arbitrary length and cross-section is produced by co- extrusion of a segmented thermoplastic copolymer elastomer (COPE) outer body over the exterior surface of an annular tubular core of CPVC/PVC having a wall thickness, measured in the radial direction, in the range from about 0.95 mm (38 mils) to about 1.375 mm (55 mils). The COPE is cohesively bonded to the annular core coextensively with essentially the entire length of the pipe. Though the COPE is easily degraded in contact with water, and CPVC and blends of CPVC with less than 25% by weight of PVC are typically rigid when extruded as pipe, a laminated pipe of COPE and CPVC/PVC with the specified wall thickness and overall dimensions which in the laminated pipe satisfy an applicable plumbing code (SDR-11 in the U.S.) has essentially the same performance characteristics as commercially available CPVC pipe.
Ce tuyau à structure multicouche, quelles qu'en soient la longueur et la section, se fabrique par co-extrusion d'un corps extérieur en copolymère élastomère (COPE) thermoplastique segmenté enveloppant la surface extérieure d'un noyau tubulaire annulaire en PVC-C/PVC dont la paroi fait radialement de 0,95 à 1,375 mm d'épaisseur (38 à 55 mils). Le COPE tient par cohésion sur le noyau annulaire en co-extension sur sensiblement toute la longueur du tuyau. Généralement, le COPE se dégrade facilement au contact de l'eau, et, en outre, le PVC-C et les mélanges de PVC-C avec moins de 25 % en masse de PVC sont généralement rigides lorsqu'ils sont extrudés en tuyau. Toutefois, si le tuyau laminé en COPE et PVC-C/PVC de l'invention présente des épaisseurs de parois et les dimensions d'ensemble respectant les spécifications de plomberie applicables aux tuyaux laminés, (SDR-11 aux Etats Unis d'Amérique), il présentera sensiblement les mêmes caractéristiques de rendement que les tuyaux en PVC-C du commerce.
Backman Arthur L.
Dalal Girish T.
Vontorcik Joseph J.
Lubrizol Advanced Materials Inc.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Noveon Inc.
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