A MULTI-LAYERED PIPE COMPRISING A CROSS-LINKED POLYETHYLENE(PEX) OUTER LAYER AND A TUBULAR CORE

摘要

A twinKED POLYET -layered pipe comprising, a cross-linked polyethylene (PEX) outer layer and a tubular core wherein the tubular core has a wall thickness, measured in the radial direction, in the range from 0.025 mm to 0.5 mm and the wall thickness of the outer layer is essentially the same as the nominal wall thickness of conventional poly (lower) olefinic pipe having the same nominal diameter; the tubular core being coextensive with essentially the entire length of pipe, the outer layer bonded to the tubular core comprising a chlorinated lower polyolefin selected from the group consisting of a randomly chlorinated polyolefin (r-CPO), a partially randomly chlorinated polyolefin (pr-CPO) and a blocky chlorinated polyolefin (b-CPO), wherein the lower olefin has from 2 to 4 carbon atoms and the chlorine content of the tubular core is in the range from 5 to 50 percent by weight and optionally a third layer of a poly(lower) olefin directly cohesively bonded to the cross-linked polyethylene layer"s outer surface to form a tri-layered pipe.