Polyefinic pipe having a chlorinated polyolefinic hollow core
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United States of America Patent
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-
Jan 9, 2007
Grant Date -
Feb 12, 2004
app pub date -
Jul 9, 2003
filing date -
Jul 23, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A multi-layered pipe of arbitrary length and cross-section is produced by co-extrusion of a lower polyolefin (C.sub.2 C.sub.4) 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.degree. C. to 250.degree. C.
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