摘要 |
<p>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 low er 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 polyolefi n (r-CPO), or, partially randomly chlorinated polyolefin (pr-CPO), or, a block y 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, o r 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. In a preferred embodiment, the outer surface of the core is directly, cohesively bonded to the outer layer's inner surface witho ut an adhesive material; in another embodiment, the core is bonded to an intermediate adhesive layer, the inner surface of which is bonded to the out er surface of the core.</p> |
申请人 |
NOVEON IP HOLDINGS CORP. |
发明人 |
VAUGHN, MICHAEL D.;BACKMAN, ARTHUR L.;AUVIL, ANDREW L.;SCHMIDT, THEODORE J.;OLAH, ANDREW M.;DALAL, GIRISH T.;DEDRICK, JAMES J. |