EXTRUSION OR PULTRUSION OF A POLYMER UNDERGOING POLYMERIZATION

摘要

A polymerizing fluid polymer (thermoplastic, elastomer, thermoset polyme r, thermoplastic elastomer, thermoplastic vulcanizate) with an optional filler (such as magnetizable ferrite powder or carbon nanotubes) is extruded or pultruded in to shaped polymer (optionally multilayer shaped polymer) so that all portions of the shaped polymer conform within a desired state of polymerization (in a multilayer coating, that the quality-related performance characteristics of shaped polymer are consistent within any coating layer). At least one (tear-drop shaped) flow diverter is describ ed for diverting flow within an extrusion (pultrusion) die so that fluid polymer moving through a short residence time portion of the die will have a more substantial residence time (than would be the case if the diverter were not used) with commensurately greater thermal, pressure, and shear stress history so that the desired conformance respectiv e to polymerization states for all portions in the shaped polymer is achieved.