Stock material or miscellaneous articles – Hollow or container type article – Polymer or resin containing
Reexamination Certificate
2007-01-09
2007-01-09
McNeil, Jennifer C. (Department: 1772)
Stock material or miscellaneous articles
Hollow or container type article
Polymer or resin containing
C428S035700, C428S036500, C428S036900, C428S515000, C428S516000, C428S518000, C428S519000, C428S523000, C138S137000, C138S140000, C138S141000, C525S356000, C525S416000
Reexamination Certificate
active
10616421
ABSTRACT:
A multi-layered pipe of arbitrary length and cross-section is produced by co-extrusion of a lower polyolefin (C2–C4) outer body over the exterior surface of a tubular core of randomly, partially randomly, or blocky chlorinated lower polyolefin, the core having a wall thickness, measured in the radial direction, in the range from about 0.025 mm to 5 mm. The tubular core is coextensive with essentially the entire length of the pipe. The tubular core comprises a major proportion by weight of the randomly chlorinated polyolefin (r-CPO), or, partially randomly chlorinated polyolefin (pr-CPO), or, a blocky chlorinated polyolefin (b-CPO), any of which may be blended with a minor proportion by weight of a blending ingredient. The r-CPO, pr-CPO or b-CPO, or a blend thereof, each has an extrusion temperature in the same range as that for the corresponding non-halogenated polyolefin, namely in the range from about 150° C. to 250° C.
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Standards Australia, AS 2492-1994, “Cross-Linked Polyethylene (PE-X) Pipe For Hot And Cold Water Applications”, pp. 5-28.
P. Vibien, et al., “Chlorine Resistance Testing of Cross-Linked Polyethylene Piping Materials”.
Auvil Andrew L.
Backman Arthur L.
Dalal Girish T.
Dedrick James J.
Olah Andrew M.
Bruenjes Chris
McNeil Jennifer C.
Noveon, Inc.
Powell Joe A.
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