Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1995-05-19
1996-11-19
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
264 128, 264 129, 26417118, 26417123, 26433115, 26433117, 425113, 4251331, B29C 4702
Patent
active
055759653
ABSTRACT:
A process for the co-extrusion of an inner layer around a conductive medium and an outer layer around the inner layer including:
(i) introducing into an extruder adapted for profile coextrusion, a preformed conductive medium; an inner layer formulation including a homogeneous polyethylene having a polydispersity in the range of about 1.5 to about 3.5 and an essentially uniform comonomer distribution, and an organic peroxide; and an outer layer formulation including (A) one of (a) a copolymer of ethylene and an unsaturated ester; (b) or a polyethylene having a polydispersity greater than about 4.0 and a density of at least 0.916 gram per cubic centimeter, said polymer made by a high pressure process; or (c) a heterogeneous copolymer of ethylene and one or more alpha-olefins having a density of less than 0.916 gram per cubic centimeter, a melt index of at least about 4 grams per 10 minutes, and a polydispersity greater than about 4.0, and, (B) optionally, an organic peroxide; and
(ii) co-extruding said formulations around the conductive medium at a temperature no higher than about 160 degrees C.
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Caronia Paul J.
Shurott Salvatore F.
Bresch Saul R.
Thurlow Jeffery R.
Union Carbide Chemicals & Plastics Technology Corporation
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